Journal articles: 'Surfaces (Technology) Mechanical wear'

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Dunaevsky, V. V. "Measurement of Local Microscopic Wear." Journal of Tribology 108, no. 1 (January 1, 1986): 35–41. http://dx.doi.org/10.1115/1.3261140.

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A method for determining a linear wear comparable to a surface roughness height is described here. The method allows estimation of the wear by results of profilometry of the worn surface only. The formulas presented provide wear evaluation for surfaces modeled by Gaussian random fields. The method simplifies the technology of precise wear measurements, improves their accuracy, and increases the availability of profilometrical ways of wear analysis.

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Bergseth, E., M. Torbacke, and U. Olofsson. "Wear in environmentally adapted lubricants with AW technology." Journal of Synthetic Lubrication 25, no. 4 (October 2008): 137–58. http://dx.doi.org/10.1002/jsl.57.

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Ciofu, Florin, and Marius Bibu. "Changes of Structure and Physical-Mechanical Properties in Alloy Steels Thermochemically Treated by Plasma Nitriding." MATEC Web of Conferences 343 (2021): 03010. http://dx.doi.org/10.1051/matecconf/202134303010.

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Plasma nitriding is a method of surface modification using a glow discharge technology to introduce nitrogen into the surface of a metal, which subsequently diffuses into the material. The main advantages of plasma nitriding over conventional nitriding processes are: reduced cycle time, controlled growth of the surface layer, elimination of white layer, reduced distortion, no need of finishing, pore-free surfaces and mechanical masks instead of copper plating. The process is especially suitable for complex parts that are intensively solicited by wear, fatigue, contact pressure, shocks, possibly also to corrosion. It is applied in order to bring the metallic products in a state favourable from the point of view of structure, chemical composition and internal stress state. The paper presents an analysis of the structures and characteristics of a widely used structural steel 39 - CrAl6. As a result of plasma nitriding, a surface layer with high wear and fatigue resistance was created on the surface of the material. Also, between the surface layer and the base material was interposed a hard substrate with high wear resistance having a bainitic / martensitic structure.

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XU, JIANG, FENG WANG, and ZILI LIU. "INVESTIGATION OF THE TRIBOLOGY BEHAVIORS OF AUTO-RESTORATION ADDITIVE UNDER HEAVY LOADING CONDITIONS." Surface Review and Letters 14, no. 02 (April 2007): 329–34. http://dx.doi.org/10.1142/s0218625x07008998.

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Lubricant additives are crucial in minimizing friction and wear, and protecting surfaces under severe contact condition. The traditional additive can only diminish the wear rate of materials by increasing the sliding distance. As a wear-self-compensation lubricating additive, the auto-restoration technology (ART) of worn surface of metals is a novel technique for the repair of mechanical equipment and breakthrough of tribology theory that cannot obey the traditional law. The previous experiments have measured the friction and wear behaviors of ART additives under low load conditions. This paper presents the tribology behaviors of auto-restoration lubricating additive under heavily loaded condition. The results show that the auto-restoration lubricating additive can reduce pronouncedly the frictional coefficient and wear weight; after 6 h wear examination the friction coefficient is only 0.027. The morphology of the worn surface and the chemical composition of tribofilm have been observed by SEM. It proved that the worn surface is very smooth and there exists a tribochemical reaction between the metal and the auto-restoration lubricating additive.

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Суслов, Анатолий, Anatoliy Suslov, Олег Федонин, Oleg Fedonin, Олег Горленко, Oleg Gorlenko, Михаил Шалыгин, Mikhail Shalygin, Леонид Захаров, and Leonid Zakharov. "Innovation technologies in mechanical engineering ensuring life increase of railway wheels and rails." Science intensive technologies in mechanical engineering 2019, no. 7 (July 1, 2019): 3–8. http://dx.doi.org/10.30987/article_5cf7bd2f83f6b5.55900953.

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In the paper it is shown that railway wheels and rails life depends considerably upon wear-resistance of their tread working surfaces. There is presented an innovation technology of a railway wheel tread electromechanical processing allowing the increase of its life. The innovation technology of railway wheel working tread electromechanical processing allowing its life increase is shown. The innovation technology for rail working tread allowing its life increase is given.

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Yong, Zhang, Qi Bo, and Sun Xinxin. "The application of ceramic technology in spherical pipe joints." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 231, no. 8 (February 2, 2017): 1078–88. http://dx.doi.org/10.1177/1350650117692660.

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Spherical pipe joints are prone to cold welding and wear, which may lead to seal failure under extreme conditions. To solve this problem, the application of ceramic technology in the spherical pipe joints is discussed in this paper. Both numerical simulations and experiments were performed for different types of coating material and different coating thicknesses. The results have demonstrated that the application of a ceramic coating could improve the sealing performance of spherical pipe joints. However, the performance was even better when a fully ceramic cone was used instead. Under the same initial torque, the number of usage cycles was much higher for the fully ceramic cone than for the coated cone, and abrasive wear was very slight. The results are expected to serve as reference for improving the sealing performance of spherical pipe joints.

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Yamaguchi, E. S., M. Untermann, S. H. Roby, P. R. Ryason, and S. W. Yeh. "Soot Wear in Diesel Engines." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 220, no. 5 (May 1, 2006): 463–69. http://dx.doi.org/10.1243/13506501j00505.

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In response to regulatory requirements, lubricant manufacturers are seeking oils that minimize soot thickening and the accompanying soot wear. Formulation technology is being developed by additive manufacturers to satisfy these requirements. For example, such work is in progress at Chevron Oronite Company LLC, using the Cummins M-11 exhaust gas recirculation (EGR) engine test as a surrogate for the anticipated soot wear test for PC-10. Simultaneously, the authors developed bench tests to screen candidate formulations and reduce costs. A ball-on-disc sliding wear test, using a PCS Instruments MTM® tribometer, has been investigated. Sliding conditions at high pressure are required for soot polishing wear. Conditions that correlate tribometer test results with M-11 engine results at high soot concentrations (∼9 per cent) have been found. Both ball wear and Stribeck curves were determined in these tests. The high-wear oil progresses from mixed lubrication conditions to boundary lubrication at higher sliding speeds than the low-wear oil. X-ray photoelectron spectroscopy experiments were also conducted on the ball wear scars, revealing differences in the chemical constitution of the tribofilms from the two oils.

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Yang, Zirun, Benguo Zhang, Haiqing Jiang, Haidi Xia, Xinjiang Zhang, and Cuifeng Jiang. "Superior wear performances of one-step forming TiCp/Ni3Al-Ni3Al multi-coating on powder metallurgy master alloy substrate." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 5 (September 30, 2018): 782–90. http://dx.doi.org/10.1177/1350650118803822.

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One-step forming TiCp/Ni3Al-Ni3Al multi-coating on powder metallurgy 316L stainless steel substrate was fabricated by vacuum hot-pressing sintering technology and its wear performances at different loads and ambient temperatures were investigated. The wear weight loss of TiCp/Ni3Al-Ni3Al multi-coating increased with the increase in the applied load and a mild-to-severe wear transition occurred. Inversely, the coating’s wear weight loss decreased as the ambient temperature increased. The high wear resistance at elevated temperatures was mainly attributed to high work-hardening capacity and high temperature strength of Ni3Al matrix. Besides, the mechanically mixed layer with dispersed TiC particulates prevented the substrate from plastic deformation and thermal softening, which were conducive to improve the wear resistance of the coating.

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Zhang, Hui, Jian Xin Deng, Gui Yu Li, Xing Ai, and Jun Zhao. "Effect of Ambient Temperature on Wear of Cemented Carbide Tool Material." Advanced Materials Research 148-149 (October 2010): 276–79. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.276.

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Cemented carbide has relatively good mechanical properties, so it is widely used as cutting tools. In this paper, a sliding wear test at high ambient temperature between cemented carbide tool material and ceramic was carried out using a ball-on-disc wear-test machine. The characteristics as to wear rate and friction coefficient were investigated. The special wear rate increased with an increase in operating temperature. The cemented carbide material with addition of TiC phase gave better wear resistance than cemented tungsten carbides at elevated temperature. SEM technology was adopted to observe the worn surfaces of specimens and wear mechanism were simultaneously discussed.

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Chavdarov, Anatoliy V., and Aleksey A. Tolkachev. "Restoration of internal surfaces of cylindrical parts of small diameters by cold gas dynamic spraying." Tekhnicheskiy servis mashin, no. 3 (August 20, 2020): 128–36. http://dx.doi.org/10.22314/2618-8287-2020-58-3-128-136.

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Wear of internal surfaces of cylindrical parts of small diameters is a common defect of equipment used in the agro-industrial complex. There are problems with low powder utilization and lack of a design solution for coating the inner surfaces of cylindrical parts with small diameters. (Research purpose) The research purpose is in evaluating the adhesive and cohesive strength and developing a technology for restoring the internal surfaces of cylindrical parts of small diameters by cold gas-dynamic spraying. (Materials and methods) Authors applied the method of cold gas dynamic spraying. The article presents a device for gas-dynamic coating on the inner surfaces of cylindrical parts and determines the optimal deposition modes for powder consumption and heating temperature. A portable DIMET-403 unit, aluminum oxide powder for surface preparation, a-20-11 aluminum powder, and a steel plate were used for the study. The weight was measured on analytical scales with an accuracy of 0.001 grams. Tests were performed on the adhesive and cohesive strength of the coating on cylindrical samples prepared by mechanical processing, under the most favorable conditions with a duration of deposition equal to 60 seconds. Samples were processed after sputtering on a lathe to obtain a cylindrical belt. (Results and discussion) The values of adhesive and cohesive strength of coatings fit into the range of values suitable for operation, and meet the conditions for obtaining a wear-resistant ceramic coating. The article presents a technology for obtaining a sublayer for the manufacture of ceramic wear-resistant surfaces in a pair of friction piston ring-cylinder. (Conclusions) The developed restoration technology of internal surfaces of cylindrical parts of small diameters by cold gas-dynamic spraying solved the problem of their wear.

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Tian, Xinli, Long Wang, Wanglong Wang, Yongdong Li, and Kaiwen Ji. "Tool wear characteristics of cutting and extrusion processing technology based on the edge-chipping effect." Industrial Lubrication and Tribology 68, no. 2 (March 14, 2016): 191–96. http://dx.doi.org/10.1108/ilt-04-2015-0051.

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Purpose – The cutting and extruding processing technology for ceramics based on the edge-chipping effect is a new contact removal machining method for hard, brittle materials such as engineering ceramics. This paper aims to provide an important reference to understand the tool wear mechanism and the wear law of this new processing technology. Design/methodology/approach – The real-time temperature monitoring and the observation of micro-morphology are used to analyse the wear characteristics of the tool face. In addition, the research focuses on the influence of three processing parameters (axial feed rate, thickness of flange and depth of groove) on characteristics including tool wear. Findings – The temperature variation shows that the new processing technology improves the tool temperatures condition. The tool is worn mainly by mechanical friction including abrasive wear, and the flank face also suffers the sustained scratching of residual materials on the rough machining surface. With increased feed rate, the wear of the rear face of the major flank initially decreased and then increased. As the depth of the retained flange increases, the wear became worse. The wear initially decreased and then increased with increasing depth of groove. Research limitations/implications – Study on the new processing technology is still in its early stages. Therefore, researchers are encouraged to test the proposed propositions further. Practical implications – The machining process itself destroys materials, albeit a controllable manner: based on this principle, the authors proposed a new machining technology based on cracks driven by edge chipping. In this way, the surface of such ceramics is removed. Therefore, the research provides a new method for reducing processing costs and promoting the extensive application of engineering ceramic materials. Originality/value – The cutting and extruding processing technology based on cracks driven by edge-chipping effect makes full use of the stress concentration effect caused by prefabricated defects, and the edge-chipping effect which occurs during machining-induced crack propagation. The wear mechanism and law of its tool is unique than other machining ways. This paper provides an important reference to understand the tool wear mechanism and the machining mechanism of this new processing technology. With the application of this study, the ceramics could be removed with less energy consumption and the tools with the hardness of lower than its own one. Therefore, it could not only reduce the processing costs but also promote the extensive applications of engineering ceramic materials.

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Zhang, Jinbo, Qingzhu Zhang, yiyuan Ge, and yongcheng jiang. "Analysis of the Wear-Resistance Characteristics of Bionic Ridge Structures." Applied Engineering in Agriculture 36, no. 5 (2020): 697–702. http://dx.doi.org/10.13031/aea.13680.

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HighlightsBionic technology can be applied to resolve agricultural engineering problems.Pangolin Squama and Chlamys Farreri shells possess excellent wear-resistance.Bionic ridges can improve sample wear-resistance.Abstract. Consistent soil contact rapidly wears the soil-engaging components of agricultural machinery, such as ploughs and subsoilers. A bionic method was applied to their structural design to improve component wear resistance. Some animal organs possess excellent wear-resistant structures which can provide design inspiration for improving the wear-resistance of agricultural mechanical parts. Previous research found that many ridges exist on Pangolin squama and Chlamys Farreri shell surfaces. Those ridges cause Pangolin squama and Chlamys Farreri shells to exhibit excellent wear-resistance. Therefore, these ridge structures were applied to the design of experimental subsoiler samples (bionic samples) to enhance their wear-resistance. An abrasive wear tester was utilized to conduct abrasive wear experiments under special experimental conditions. These experimental conditions involved sliding speed, soil particle size, moisture content, and space between the ridges. Finally, nine experiments were conducted that subjected the bionic and flat surface samples to different experimental conditions, and their respective mass-loss quantities were measured. Results show that bionic sample mass loss was less than that of the flat surface samples under the same experimental conditions; bionic sample wear-resistance improved by 77%, 73.8%, 66.9%, 45.4%, 58.9%, 65.5%, 33.1%, 66.4%, and 42.6% when compared with flat surface samples under the same experimental conditions. Orthogonal test results reveal that the soil particle size most significantly affected sample wear-resistance, followed by the space between bionic ridges and the sliding speed. One reason that bionic samples exhibited excellent wear-resistance is that the soil particles underwent a “guiding effect” and a “rolling effect” over the bionic ridge surface, thereby reducing the “micro-plowing” that soil particles generated when moving over the contact surface. Mutual interference among soil particles also reduced wear. Part of the soil particles rushing over the bionic sample surface rebounded back; the rebounded soil particles collided with incoming soil particles, then the speed and kinetic energy of all of the particles decreased and sample surface abrasion declined. Moreover, “vortexes” generated by sample surface air and ridges lead to an “air cushion” effect which can lessen the number of sample surface soil particles, and bionic ridge sample abrasions can be significantly reduced. Abrasion experiment results analysis indicates that bionic ridges distributed on subsoiler sample surfaces can significantly improve wear-resistance. The bionic design method provides a new approach for increasing the wear-resistance of the soil-engaging components of agricultural machinery. Keywords: Abrasive wear, Bionic ridge, Optimal design, Wear-resistance.

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Liu, Eryong, Furong Wang, Shuangming Du, Zhixiang Zeng, Huiling Du, and Yaping Bai. "Effect of Cr2O3 on the microstructure and tribological performance of sprayed Fe-based coating on cylinder liner." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 3 (August 25, 2019): 435–47. http://dx.doi.org/10.1177/1350650119870964.

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Improving the vehicle efficiency by weight reduction and friction loss has become the severe challenge to machinery manufacturers. Generally, replacing heavy cast iron engine component by aluminum alloys played a key role in reducing fuel consumption and pollutants emission, but the durability in poor mechanical properties of aluminum alloys restricted its application in severe conditions of engine cylinder. In order to improve the tribological properties of aluminum cylinder liner, Cr2O3-added Fe-based coating was prepared by plasma spraying technology, and the effect of Cr2O3 on the microstructure and tribological performance of sprayed coating was investigated in this study. All the Cr2O3-added coatings improved mechanical properties significantly, such as hardness and wear resistance compared to that of Fe-based alloy. However, appropriate content of Cr2O3 was beneficial to wear resistant but the excessive Cr2O3 deteriorated the wear resistance under dry sliding condition. The degradation was likely generated by the embrittlement of the Cr2O3 reinforcements, weaker interface of Cr2O3/matrix, and the inherent lamellar structure of sprayed coating. As a result, Fe-based coating with 30 wt.% Cr2O3 provided excellent mechanical properties and can be substitute for the application in aluminum alloy cylinder liner.

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Seong, Yeonuk, Donghyeon Lee, Jihye Yeom, and Junhong Park. "The Feature Extraction through Wavelet Coefficients of Metal Friction Noise for Adhesive and Abrasive Wear Monitoring." Applied Sciences 11, no. 9 (April 21, 2021): 3755. http://dx.doi.org/10.3390/app11093755.

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Friction between metals is a physical phenomenon that occurs in manufacturing machine tools. This annoying noise implies unnecessary metal contact and deterioration of a mechanical system. In this study, for the monitoring of the friction between two metal surfaces, the acoustic signature was extracted by applying the wavelet transform method to the noise measured from the change in contact force for each state of adhesive and abrasive wear. Experiments were conducted with a constant relative speed between the contacting metal surfaces. For the adhesive wear, the peak signal-to-noise ratio (PSNR) calculated by the wavelet transformation increases with the increasing contact pressure. Opposite trends were observed for the abrasive wear. The proposed index formed a group within a specific range. This ratio exhibited a strong relationship with the wear characteristics and the surface condition. From the proposed index calculated by the wavelet coefficients, the continuous monitoring of the wear influence on the failure of the machine movement operations is achieved by the sound radiation from the contacting surfaces.

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Umanath, K., S. T. Selvamani, K. Palanikumar, and Ram G. Dinesh. "Worn Surface Analysis of Hybrid Metal Matrix Composite." Advanced Materials Research 984-985 (July 2014): 546–50. http://dx.doi.org/10.4028/www.scientific.net/amr.984-985.546.

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Metal to the metal wear analysis of Aluminium (Al6061grade) alloy, dis-continuously reinforced with ceramic particles of SiC and Al2O3deliver this paper. The Al matrix with 5 to 25% of vol. Fractions of SiC and Al2O3particulate reinforcements were formed in Hybrid Metal Matrix Composite (HMMC) by stirring casting technology. They are finding applications in automotive, aeronautical and sport goods. For the proper use of these composites, its mechanical properties and wear properties are to be evaluated. The dry sliding behavior of these SiC and Al2O3particulates HMMCs and that of Al alloy at atmosphere was analyzed with a pin on disc type wear testing machine. The result indicates that, the scanning electron micrographs of the worn surfaces of the hybrid composites show the worn surface of the composite alloy is rougher than the unreinforced Al6061alloy.

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He, Long, Ye Fa Tan, Bin Cai, Hua Tan, Li Gao, and Zhong Wei Zhang. "Research on Friction and Wear Properties of Plasma Spraying Ni-Base Alloy Coatings on Aluminum Alloy Surfaces." Advanced Materials Research 538-541 (June 2012): 207–13. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.207.

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In order to improve the wear resistance and extend service life of aluminum alloy parts, the Ni-base alloy anti-wear coatings were prepared on the surfaces of 7A05 aluminum alloy by plasma spraying technology. The microstructure and interface of the coatings were analyzed, and the friction and wear properties of Ni-base alloy coatings and aluminum alloy substrates were investigated under dry friction condition at room temperature. The research results show that the main phases of Ni-base alloy coating are γ-Ni, CrB and Cr23C6. The thicknesses of diffusion layers existing between intermediate layer and coating, intermediate layer and substrate are respectively 15μm and 20μm. The bonding types of the coating and the substrate are mechanical combination accompanied with partially metallurgical combination. When wore against GCr15 steel balls, the average friction coefficient of the Ni-base alloy coatings is 11.6% lower than that of the aluminum alloy substrates, and the average wear loss of the former is 9.3mg, which is only 1/3 of that of the latter. With the increase of loads, the wear mechanisms of the Ni-base alloy coatings change from slightly micro-cutting wear and fatigue wear to abrasive wear and micro-fracture wear, while those of the aluminum alloy substrates are mainly adhesive wear and abrasive wear as well as slight oxidation wear.

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TRYBA, Dagmara, Marcin KOT, and Anna ANTOSZ. "AN ANALYSYS OF WEAR AND MECHANICAL AND TRIBOLOGICAL PROPERTIES OF HIGH-MANGANESE CAST STEEL HARDENED BY DIFFERENT METHODS." Tribologia 280, no. 4 (August 1, 2018): 137–42. http://dx.doi.org/10.5604/01.3001.0012.7554.

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Properties of high manganese austenitic cast steel are not satisfactory; therefore, this material should be hardened. Currently, the commonly used method of hardening does not allow eliminating problems related to premature wear of railway frogs. Therefore, many studies have been carried out to find an alternative method to obtain improved wear resistance of such elements. The article presents an analysis of the mechanical and tribological properties of base and hardened, by different methods, high-manganese cast steel applied for turnouts. Tests were performed for three hardening methods: explosive, pressure-rolling, and dynamic impact. The results were compared with the properties of base material after saturation treatment. The conducted tests allowed the determination of hardness profiles of hardened surfaces, as well as the wear resistance and coefficient of friction, and the obtained results are very promising. Hardening by dynamic impact provided much better results in relation to presently used explosive hardening technology.

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Naeem, Aneeqa, Esham Butt, Hamza Khawaja, Irfan Nadeem, Rehan Akhter, and Anjum Tauqir. "Microsecond Laser Texturing of an Aerospace Grade Aluminum Alloy to Synthesize Superhydrophobic, Anti-Water Clogging Surfaces." Key Engineering Materials 875 (February 2021): 322–28. http://dx.doi.org/10.4028/www.scientific.net/kem.875.322.

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Traditionally superhydrophobic surfaces are prepared by applying liquid repellant organic coatings or nano-based coatings. These superhydrophobic coatings are prone to wear and can be easily damaged by abrasion and cleaning. Recently researchers are switching interest to more efficient and promising technology of pulse laser texturing for engineering sub-micron topographies to have superhydrophobic surfaces. In this research, the micro-second Laser Pulses are used to feature sub-micron textures on titanium nitride coated aluminum and polished aluminum surfaces in order to achieve the water contact angle greater than 150°. Titanium nitride coated aluminum surface with scan line separation of 50 µm shows superior hydrophobicity having a water contact angle of 156º. These superhydrophobic aluminum surfaces have applications for anti-water clogging and anti-corrosion use.

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Yu, Jae-Hyun, Ki Yong Lee, Do-Sik Shim, and Sang-Hu Park. "Metal embedding and ultrasonic nanocrystal surface modification technology for super wear-resistant mechanical parts." International Journal of Advanced Manufacturing Technology 101, no. 1-4 (November 12, 2018): 951–62. http://dx.doi.org/10.1007/s00170-018-2920-y.

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CHRONOWSKA-PRZYWARA, Kinga, and Marcin KOT. "ANALYSIS OF FRACTURE AND WEAR RESISTANCE OF ZrN COATINGS." Tribologia 273, no. 3 (June 30, 2018): 39–45. http://dx.doi.org/10.5604/01.3001.0010.6119.

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The article presents the results of mechanical and tribological studies of ZrN coatings that allowed the determination of their hardness, elasticity modulus, and scratch and wear resistance. Tests were carried out for 1, 1.4, and 2 μm thick ZrN coatings deposited on X5CrNi18-10 austenitic steel substrates by PVD technology. Hardness and Young's modulus of coatings, evaluated by nanoindentation, were within the 26–32 GPa, and 330–360 GPa ranges, respectively. Analysis of the adhesion of the coating to the substrate was carried out based on the results of the scratch test. The highest critical load values of LC1 and LC2 were measured for the 1.4 μm thick coating. Tribological tests performed using a ball-on-disc tribotester showed that the wear resistance increases with coating thickness. This was accompanied by a reduction of the coefficient of friction from 0.22 to 0.17.

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Xia, Zhen Sheng, Ben Sheng Zhang, and De Yao Zhao. "Study on Plating Bath Preparation Method of Novel Nano-Composite Plating." Advanced Materials Research 546-547 (July 2012): 13–18. http://dx.doi.org/10.4028/www.scientific.net/amr.546-547.13.

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This article studies plating bath preparation method of novel nano-composite plating technology to improve properties of coatings when repairing the wear of equipments surface with the application of composite plating technology. The Nanoparticles of plating bath use Al2O3, metal substrates use Fe-based nano-composite plating coatings of Fe. The liquids ingredients of plating bath are prepared with ferric chloride and hydrochloric acid. The experiments of mechanical properties indicate that this plating method is an advanced technology on repairing the surface wear, which can effectively enhance the coatings properties of hardness, strength and wear resistance, which especially is suitable for the restoration to the wear of the high accuracy metal components of important equipments

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Yin, Yan, Jiusheng Bao, and Lei Yang. "Wear performance and its online monitoring of the semimetal brake lining for automobiles." Industrial Lubrication and Tribology 66, no. 1 (February 4, 2014): 100–105. http://dx.doi.org/10.1108/ilt-07-2011-0057.

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Purpose – In order to improving the braking reliability and assuring the driving safety of automobiles, this paper aims at the wear performance and its online monitoring of its brake lining. Design/methodology/approach – The wear performance of the semimetal brake lining for automobiles was investigated on a self-made braking tester for disc brakes. Based on the experimental data, an intelligent forecasting model for the wear rate was established by the artificial neural network (ANN) technology. And by taking it as a core, an online braking wear monitoring system for automobiles was designed. Findings – It is shown that the wear rate rises obviously with the increasing of both initial braking velocity and braking pressure. By the contrast, the initial braking velocity affects the wear rate more seriously. The ANN model trained by the experimental data shows favorable capability for predicting of the wear rate. The big forecasting errors at high velocity and heavy load should be attributed to the jumping of the wear rate at this period. Based on the existed sensors and electronic control unit system of automobiles, the online braking wear monitoring system can be established easily by the ANN technology. Originality/value – A self-made braking tester for disc brakes was used to test the wear performance, which can simulate better the actual disc braking conditions than the standard pin-on-disc friction tester. An online braking wear monitoring system was designed to help improving the braking reliability and safety of automobiles.

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RUTKOWSKI, Sławomir, Rafał DUDEK, and Krzysztof WŁADZIELCZYK. "INFLUENCE OF PAD WELDING ON THE WEAR OF VIBRATION RIPPER TEETH." Tribologia 287, no. 5 (October 31, 2019): 77–85. http://dx.doi.org/10.5604/01.3001.0013.6565.

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Due to the rapid wear of the teeth of the vibration rippers that work to compact and very compact soils, their regeneration by means of pad welding is becoming more and more common. This article presents the technology of pad welding ripper teeth and materials used to pad them. The paper presents the results of comparative research in the wear of new teeth and teeth subjected to the process of pad welding. The research results showed lower wear in welded teeth. The use of padding welds to strengthen the surface of teeth results in prolonging their service life.

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Maliutina, Iuliia N., Hocine Si-Mohand, Romain Piolet, Florent Missemer, and Philippe Bertrand. "Mechanical and Tribological Properties of γ-TiAl-Based Coatings Produced by the Laser Cladding Technology." Applied Mechanics and Materials 788 (August 2015): 194–98. http://dx.doi.org/10.4028/www.scientific.net/amm.788.194.

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Coatings from the γ-TiAl-based powder characterized by enhanced microhardness compared to that of titanium substrates were produced by the laser cladding technology. In the current paper wear mechanisms of substrates and coating materials under sliding friction conditions are described in detail. The wear of the substrate material was due to the seizure mechanism related to the mass transport of a considerable volume of the specimen material and a steel indenter. Only shallow notches without any mutual mass transport signs were observed on the coating surface after a sliding friction test.

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., Nagaraja, Raviraja Adhikari, and T. Yasir. "An investigation into tapping of Al6061/SiC metal matrix composite with straight flute HSS machine tap." Journal of Mechanical Engineering and Sciences 13, no. 1 (March 29, 2019): 4575–95. http://dx.doi.org/10.15282/jmes.13.1.2019.16.0386.

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The present study deals with tapping of Al6061/SiC metal matrix composite. Stir casting technique was used for the fabrication of composite. Castings were produced by varying weight percentages of SiC (5%, 7.5% and 10%) of 23μm size in Al6061. The tapping experiments were conducted for the machinability study of Al6061/SiC metal matrix composite using M8 x 1.25 HSS machine taps. The tapping operation was performed under dry condition with different cutting speeds. Torque required for tapping was measured using piezoelectric based 4-component drill tool dynamometer. Surface morphology and profile of thread surfaces were analysed using Scanning Electron Microscope (SEM) and metallurgical microscope. Estimation of progressive flank wear of machine taps was undertaken using profile projector. The performance of HSS machine tap was evaluated in terms of tapping torque, tool flank wear, and surface characteristics of thread surfaces. The flank wear of uncoated HSS machine tap increased with the increase in weight percentage of SiC in Al/SiC composite for a particular cutting speed. Further, when the matrix materials were reinforced by the same kind and the same weight percentage of SiC particles, the flank wear of the tool was found to increase with cutting speed. In addition, the damage caused to thread profiles increased with the increase in cutting speed and weight percentage of SiC.

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Thornton, H. R., E. I. Bailey, and J. S. Williamson. "Friction and Wear in Threaded Surfaces of Rotary Drill Collars." Journal of Energy Resources Technology 115, no. 1 (March 1, 1993): 23–31. http://dx.doi.org/10.1115/1.2905966.

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Two surfaces, under high normal stress, in sliding contact provide the basis for friction and wear studies within rotary drill collars. Flat and ring specimens, considering three (3) different contact areas, were rotated to determine the effect of surface finish, coatings, lubricants and normal stress on friction and wear. The 4145 steel specimens were heat-treated to a yield strength of 124,000 lb/in2 (855 MPa) and a Rc hardness of 28. The torque required to rotate the ring specimen was measured as a function of the rotation angle. The friction coefficient was calculated. Seizure and galling were common for metal-to-metal contact. Rust and phosphate coatings break down under the high normal stress. Metal-filled lubricants produce static coefficients of friction (μs) between 0.03 and 0.25 and dynamic coefficients between 0.04 and 0.26. Seizure and galling were not observed.

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Mosaddegh, Peiman, Saleh Akbarzadeh, Mostafa Zareei, and Hassan Reiszadeh. "Tribological behavior of BK7 optical glass at elevated temperatures." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 4 (July 13, 2018): 580–92. http://dx.doi.org/10.1177/1350650118788756.

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Aspherical lenses are produced using glass molding technology in a temperature close to its glass transition temperature. Friction and wear between the moving mold surface and the heated glass is one of the important aspects of the optical lenses production. This paper presents an experimental study on the tribological behavior of BK7 optical glass at elevated temperatures using pin-on-disk test rig. Thirty experiments have been conducted to study the effect of operating temperature, applied load, and sliding speed on the friction coefficient and wear rate of BK7 optical glass disks in contact with alumina pin. Also, the relation between the generated entropy and the weight loss under different operating conditions has been studied. The experimental results show that with increasing the temperature up to the glass transition temperature, the wear volume and friction coefficient increase. Further increase in the temperature results in a decrease in the wear volume and friction coefficient. Increasing the applied load results in an increase in the wear rate. An investigation on the correlation of wear rate and the dissipated power shows a linear relation between these two parameters.

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Schirdewahn, Stephan, Felix Spranger, Kai Hilgenberg, and Marion Merklein. "Laser Implantation of Niobium and Titanium-Based Particles on Hot Working Tool Surfaces for Improving the Tribological Performance within Hot Stamping." Defect and Diffusion Forum 404 (October 2020): 117–23. http://dx.doi.org/10.4028/www.scientific.net/ddf.404.117.

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Within the scope of this work, a new approach named laser implantation process has been investigated, in order to improve the tribological performance of hot stamping tools. This surface engineering technology enables the generation of dome-shaped, elevated and highly wear resistant microfeatures on tool surfaces in consequence of a localized dispersing of hard ceramic particles via pulsed laser radiation. As a result, the topography and material properties of the tool and thus the tribological interactions at the blank-die interface are locally influenced. However, a suitable selection of hard ceramic particles is imperative for generating defect-free surface features with a high share of homogenously disturbed particles. For this purpose, different niobium (NbB2 and NbC) as well as titanium-based (TiB2 and TiC) materials were embedded on hot working tool specimens and subsequently analyzed with regard to their resulting shape and mechanical properties. Afterwards, modified pin-on-disk tests were carried out by using conventional and laser-implanted tool surfaces, in order to evaluate the wear and friction behavior of both tooling systems.

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Zhao, Yuncai, Fei Yang, and Yongming Guo. "Research on the tribological properties of a textured lubricating wear-resistant coating modified by nano-SiC at high temperature." Industrial Lubrication and Tribology 67, no. 1 (February 9, 2015): 59–65. http://dx.doi.org/10.1108/ilt-03-2014-0028.

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Purpose – The purpose of this paper is to investigate the tribological properties of a textured lubricating wear-resistant coating modified by nano-SiC at a high temperature. Its aim is to explore the influence of a new composite method on the organisation and structure of sprayed coatings as well as the evolution rules governing their high-temperature tribological properties. Design/methodology/approach – A KF301/WS2 lubricating, wear-resisting, coating was prepared on matrix material GCr15 by applying supersonic plasma spraying technology. On the basis of this sample, using nano-SiC particles as a filler, the KF301/WS2 nano-modified coating with its round, pit-type texture was prepared by laser re-melting technology and a surface texturing technique. Two kinds of coating micro-organisations and structures were examined by scanning electron microscopy, and the tribological properties of both the modified and conventional coatings were studied at a high temperature. Findings – Results showed that nano-particles could effectively improve the coating micro-structure, and make the structure denser and more uniform, thus significantly increasing the wear resistance of the coating. When the friction and wear processes were stable, the friction coefficient decreased by 13 per cent, while the wear loss decreased by 45.9 per cent. Originality/value – This research concentrating on the study of the process and performance of coatings doped with nano-particles by laser re-melting incorporating simultaneous surface texturing, and studies of their high-temperature tribological properties. That is because applying nano-particle modification technology to the development of wear-resistant coatings, and by applying the nano-particles to such coatings by thermal spraying technology, they can achieve a modification of the coating which makes the structure denser and more uniform.

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Dong, Shuhan, Huiyong Yuan, Xiaochao Cheng, Xue Zhao, Mingxu Yang, Yongzhe Fan, and Xiaoming Cao. "Improved Friction and Wear Properties of Al6061-Matrix Composites Reinforced by Cu-Ni Double-Layer-Coated Carbon Fibers." Metals 10, no. 11 (November 19, 2020): 1542. http://dx.doi.org/10.3390/met10111542.

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The friction and wear properties of an Al6061 alloy reinforced with carbon fibers (CF) modified with Cu-Ni bimetallic layers were researched. Cu-Ni double layers were applied to the CF by electroless plating and Al6061-matrix composites were prepared by powder metallurgy technology. The metal-CF/Al interfaces and post-dry-wear-testing wear loss weights, friction coefficients, worn surfaces, and wear debris were characterized. After T6 heat treatment, the interfacial bonding mechanism of Cu-Ni-CF changed from mechanical bonding to diffusion bonding and showed improved interfacial bonding strength because the Cu transition layer reduced the fiber damage caused by Ni diffusion. The metal–CF interfacial bonding strongly influenced the composite’s tribological properties. Compared to the Ni-CF/Al and Cu-CF/Al composites, the Cu-Ni-CF/Al composite showed the highest hardness, the lowest friction coefficient and wear rate, and the best load-carrying capacity. The wear mechanisms of Cu-Ni-CF/Al composite are mainly slight abrasive wear and adhesive wear.

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Zhan, Jian, and Mingjiang Yang. "Investigation on the application of YAG laser texturing technology to the cylinder wall of auto engine." Industrial Lubrication and Tribology 66, no. 3 (April 8, 2014): 387–92. http://dx.doi.org/10.1108/ilt-12-2011-0109.

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Purpose – The purpose of this study was to develop a new approach using a pulse YAG laser with rational power density and pulse width to texture desired discrete distribution morphology on the cylinder wall. Design/methodology/approach – Variational rules of the effects of these three parameters were found by calculating the oil film on the cylinder/piston ring system. The experiment results were compared between laser texturing cylinders and conventional honing cylinders. Findings – It was found that the coefficient of friction and wear rate of laser texturing cylinders were reduced by 50 and 85.7 per cent, respectively, and the piston ring wear rate was decreased by 50 per cent under full lubrication condition. Under starved lubrication condition, the cylinder liner wear was reduced by 34.3 per cent. Originality/value – The effectiveness of which was determined by three control parameters: depth-to-diameter ratio, area density and distribution angle of the dimples.

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Sklenak, Sebastian, Jens Brimmers, Christian Brecher, Bastian Lenz, and Andreas Mehner. "Tribologisches Einsatzverhalten von PVD-Festschmierstoffsystemen im fluidfreien Wälzkontakt." Tribologie und Schmierungstechnik 68, no. 3-4 (September 21, 2021): 71–78. http://dx.doi.org/10.24053/tus-2021-0023.

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For special applications, the lubrication of gearboxes with liquid lubricants is not feasible. Liquid lubricants lose their positive lubricating properties when exposed to high contact stress and temperature fluctuations, for example. In the food industry and medical technology, liquid lubricants are often not permitted due to hygiene regulations. Solid lubricants offer an approach to implement dry tooth contacts. In this report, three different solid lubricant coating systems are investigated under different operating conditions. The focus of the experi mental investigation is the application behavior in terms of friction force and wear behavior. In a direct comparison, the MoS2:Ti-TiN coating system achieves the highest load level and exhibits a station ary frictional force behavior compared to the a-C:H:Ti-TiN coating system. In the wear investigation, continuous coating wear was found in addition to coating delamination. The layer wear correlates with an increasing friction force in interval operation.

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Jia, Peng, M. Zhou, and S. N. Huang. "Progressive Tool Wear in Diamond Cutting of Glass Soda-Lime." Key Engineering Materials 499 (January 2012): 138–43. http://dx.doi.org/10.4028/www.scientific.net/kem.499.138.

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For the technology of diamond cutting of optical glass, the high tool wear rate is a main reason for hindering the practical application of this technology. Minimizing the tool wear is of great significance in order to achieve the satisfactory surface quality and dimensional accuracy. For in depth understanding of the tool wear mechanisms, experiments of diamond turning with cutting distance increased gradually was carried out on soda-lime glass in this work. Experimental results indicate that the flank wear was predominant in diamond cutting glass and the flank wear land was characterized by micro-grooves, some smooth crater on the rake face was also seen. The mainly mechanisms inducing tool wear in diamond cutting of glass are diffusion, mechanical friction, thermo-chemical action and abrasive wear.

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Six, K., T. Mihalj, C. Marte, D. Künstner, S. Scheriau, P. Dietmaier, and G. Trummer. "Rolling contact fatigue behaviour of rails: Wedge model predictions in T-Gamma world." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 234, no. 10 (December 31, 2019): 1335–45. http://dx.doi.org/10.1177/0954409719896941.

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In this study, T-Gamma and Wedge models have been compared with each other for the prediction of surface-initiated rolling contact fatigue cracks on rail surfaces. Both models are able to account for different observed rolling contact fatigue-wear regimes in tracks, but with very different physical backgrounds. The T-Gamma model uses empirically determined damage functions by introducing a relationship between the wear number (T-Gamma) and the rolling contact fatigue damage increment. Different rolling contact fatigue-wear regimes are considered in this empirical approach based on the idea that initiated cracks get partially or fully removed by the wear mechanism, not accounting for the full complexity of the occurring tribological phenomena. The Wedge model represents a physical approach, where contact stresses and its impact on plastic deformations and related material anisotropy are considered. Thus, the prediction of different rolling contact fatigue-wear regimes is based on these physical relationships, where plastic shear deformations in the near-surface layer play a key role. For comparison, the wheel–rail contact data from stochastic multibody dynamics simulations of a metro vehicle with conventional bogie technology running in three curve radii have been used. While the T-Gamma model always predicts the same rolling contact fatigue damage increment for a given T-Gamma value, the Wedge model shows a scattering of the predicted rolling contact fatigue damage increments when plotting them over T-Gamma because of the explicit consideration of contact stresses. Thus, each scenario consisting, for example, of certain vehicles, curve radius, wheel–rail profile combination, friction conditions, rail material, etc. needs its own damage function in the T-Gamma world. This should be kept in mind when applying the standard T-Gamma model to scenarios which differ significantly from the scenario it has been parameterised for.

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Houdková, Šárka, František Zahálka, and Michaela Kašparová. "The Influence of Thermally Sprayed Coatings Microstructure on their Mechanical and Tribological Characteristics." Materials Science Forum 567-568 (December 2007): 229–32. http://dx.doi.org/10.4028/www.scientific.net/msf.567-568.229.

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The tribological properties of parts surface, namely their wear resistance and friction properties, are in many cases determining for their proper function. To improve surface properties, it is possible to create hard, wear resistant coatings by thermal spray technologies. Using these versatile coatings it is possible to increase parts lifetime, reliability and safety. The thermally sprayed cermet composite coatings show, thanks to their specific properties, excellent resistance to abrasive and erosive wear, as well as corrosion resistance. To predict the behavior, lifetime and application area of thermally sprayed cermet coatings it is necessary to completely understand the relationships between technology, process parameters, microstructure and properties of the coatings. The finding of these relationships and use this understanding to develop deposits with improved wear resistance for coating of various applications is the main aim of the presented work. It was done by studying the coatings microstructure and mechanical properties. Four different tests of wear resistance were done to study the mechanism of surface degradation, to confirm the results of mechanical testing and to predict the lifetime of coated parts - the abrasive wear performance of the coatings was assessed using a dry/sand rubber wheel test according to ASTM G-65, wet slurry abrasion test according to ASTM G-75, pin-on-disc test according to ASTM G-99 and erosion wear resistance for three impact angles. On the basis of obtained data the new possibilities of coatings application was determined, tested and implemented.

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Zhao, Yuncai, Fei Yang, and Yongming Guo. "Study on antifriction mechanism of lubricating wear-resistant coating with parallel texture." Industrial Lubrication and Tribology 67, no. 5 (August 10, 2015): 418–24. http://dx.doi.org/10.1108/ilt-11-2013-0117.

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Purpose – The purpose of this paper is to investigate the effects of parallel texturing coating on antifriction mechanism of lubricating wear-resistant coating. Design/methodology/approach – A KF301/WS2 lubricating wear-resisting coating was prepared on matrix material GCr15 by applying supersonic plasma spraying technology. On the basis of this sample, the KF301/WS2 modified coating with parallel pit-type texture was prepared by laser re-melting technology and a surface texturing technique. Their friction and wear behaviors were evaluated under ambient temperature, and the antifriction mechanism of two kinds of coatings were discussed. Findings – Results showed that parallel texture has a certain impact on the tribological properties of the coating. When friction and wear reach stable state, the value of the friction coefficient of conventional coating was 0.115, while that of parallel texturing coating was 0.09, the latter decreased by 21 per cent. When the friction and wear time was up to 4 hours, the wear loss of the conventional coating was 0.29 mg, while that of the parallel texturing coating was 0.13 mg, the latter decreased by 55 per cent. Originality/value – The tribological properties of parallel texturing coating were higher than conventional coating. That is because the change of three-body layer reduces the friction coefficient and the abrasive particles were collected by parallel texture, reducing the effects of debris.

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Pasovets, V. N., V. A. Kovtun, and Yu M. Pleskachevsky. "Wear resistance of nanostructured metal-polymer self-lubricating powder composites." Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series 66, no. 2 (July 16, 2021): 154–60. http://dx.doi.org/10.29235/1561-8358-2021-66-2-154-160.

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Tribotechnical tests and microstructural studies were carried out. Wear mechanism of nanostructured metalpolymer self-lubricating composite materials has been established. This mechanism involves in the formation of separating polymer layers on the friction surface, which reduces the coefficient of friction and running-in period of parts of friction units. Carbon nanoparticles move along the friction surface, hinder the development of seizure processes during the interaction of microroughnesses of the contacting surfaces of the material and the counterbody during the destruction of the separating polymer layers. It was found that the polymer filler is displaced from the friction zone, carbon nanoparticles are pressed into the open areas of the surface of the copper matrix of the composite when the pressure in the tribocontact is higher than 1.5 MPa. The temperature in the tribocontact increases, the polymer filler degrades, the carbon nanoparticles are removed from the friction zone, the strength properties of the composite decrease, the friction coefficient and the wear rate increase at a sliding speed above 1.5 m/s. The obtained research results can be used in mechanical engineering, transportation industry and power engineering.

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Dehbi, Said, and Khaled Hamouda. "Improved Surface Quality by the Process of Vibratory Grinding." Defect and Diffusion Forum 365 (July 2015): 183–87. http://dx.doi.org/10.4028/www.scientific.net/ddf.365.183.

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The main purpose of this work is the energy saving by reducing friction and minimizing wear to avoid losses by raising the properties of nanomaterials on the surface layer. Therefore, we develop approaches for studying the tribological behavior phenomena concerning materials on surfaces of the layers to define the mechanical and tribological properties of materials to improve the surface layer materials of the treated parts. It was used for the vibratory grinding method of chemical mechanical processing surface using the technology of low-frequency vibration in the treatment of metal parts in the presence of chemical additives, which have a great influence on the improvement of mechanical and geometrical parameters (roughness, fatigue resistance, corrosion resistance, micro and macro hardness, structure) of mechanical parts. This method of vibratory grinding has great advantages such as the treatment of complex mechanical parts, the ability to process parts of different types and shapes at the same time. It is also known to be an environmentally friendly process. Thus this work consisted of a surface treatment by vibratory grinding of samples of different materials.

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Miyake, S., R. Kaneko, Y. Kikuya, and I. Sugimoto. "Micro-Tribological Studies on Fluorinated Carbon Films." Journal of Tribology 113, no. 2 (April 1, 1991): 384–89. http://dx.doi.org/10.1115/1.2920633.

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Micro-tribology is a key technology in micro-mechanics and the magnetic recording head-media interface. The atomic-scale surface state is very important in micro-tribology. However, the concepts of micro-tribological material design are not clear. The top-surface must be modified to improve micro-tribological properties. To improve adhesion and strength, hard carbon films containing silicon deposited by an electron cyclotron resonance (ECR) plasma depositor are examined for friction and wear using a reciprocating tribometer. Fluorinated silicon-containing films are deposited to reduce atomic-scale wear. Micro-tribological properties of this film are investigated by ultra-low load wear-testing, leading to the following conclusions: (1) The micro-tribological characteristics of silicon-containing carbon film are improved by fluorination. Fluorination decreases the surface energy, evaluated by contact angle to the water, and reduces the micro-wear on an atomic scale. (2) The adhesion to the substrate and the strength of the carbon film are greatly improved by adding small quantities of silicon. These films also have significantly longer lubricating lives.

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Yoshida, Takehito, Hiroyuki Karasawa, Rui Fukui, Kohei Fujii, and Shin'ichi Warisawa. "Analysis of chip size distribution using image processing technology to estimate wear state of cylindrical grinding wheel." Tribology International 153 (January 2021): 106600. http://dx.doi.org/10.1016/j.triboint.2020.106600.

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Edigarov, V. R. "TECHNOLOGY OF COMBINED ELECTROMECHANICAL TREATMENT WITH PROFILE ROLLING." Spravochnik. Inzhenernyi zhurnal, no. 280 (July 2020): 21–27. http://dx.doi.org/10.14489/hb.2020.07.pp.021-027.

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The technology of combined electromechanical treatment with profile rolling is presented, which is a combination of electromechanical treatment and surface plastic deformation, which allows to create on the surface directed regular microrelief. The proposed technology is tested during processing of parts of multipurpose tracked and wheeled machines operating under difficult loading conditions, signalternating dynamic loads, often with limited lubricant or presence of abrasive in its composition. Reasonable selection of relief (pattern) of treated surface makes it possible to maximize retention of lubricating material in zone of tribocontact, as well as to increase wear resistance of parts and to create residual compression stresses in surface layer. The mechanical properties of the surface layer of the sample with a strengthened geometric pattern by changing the microhardness of the smoothed surface and oil pockets (channels) obtained by surface plastic deformation were examined. Electromechanical treatment by rolling the profile makes it possible to create on the surface a strengthened surface layer with naturally varying parameters with the specified regular micro-relief including oil pockets (channels) and reinforced tracks, at the same time considerable increase of wear resistance of triboscreating is provided.

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Edigarov, V. R. "TECHNOLOGY OF COMBINED ELECTROMECHANICAL TREATMENT WITH PROFILE ROLLING." Spravochnik. Inzhenernyi zhurnal, no. 280 (July 2020): 21–27. http://dx.doi.org/10.14489/hb.2020.07.pp.021-027.

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The technology of combined electromechanical treatment with profile rolling is presented, which is a combination of electromechanical treatment and surface plastic deformation, which allows to create on the surface directed regular microrelief. The proposed technology is tested during processing of parts of multipurpose tracked and wheeled machines operating under difficult loading conditions, signalternating dynamic loads, often with limited lubricant or presence of abrasive in its composition. Reasonable selection of relief (pattern) of treated surface makes it possible to maximize retention of lubricating material in zone of tribocontact, as well as to increase wear resistance of parts and to create residual compression stresses in surface layer. The mechanical properties of the surface layer of the sample with a strengthened geometric pattern by changing the microhardness of the smoothed surface and oil pockets (channels) obtained by surface plastic deformation were examined. Electromechanical treatment by rolling the profile makes it possible to create on the surface a strengthened surface layer with naturally varying parameters with the specified regular micro-relief including oil pockets (channels) and reinforced tracks, at the same time considerable increase of wear resistance of triboscreating is provided.

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43

Prakash, Chander, Sunpreet Singh, Catalin Pruncu, Vinod Mishra, Grzegorz Królczyk, Danil Pimenov, and Alokesh Pramanik. "Surface Modification of Ti-6Al-4V Alloy by Electrical Discharge Coating Process Using Partially Sintered Ti-Nb Electrode." Materials 12, no. 7 (March 27, 2019): 1006. http://dx.doi.org/10.3390/ma12071006.

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In the present research, a composite layer of TiO2-TiC-NbO-NbC was coated on the Ti-64 alloy using two different methods (i.e., the electric discharge coating (EDC) and electric discharge machining processes) while the Nb powder were mixed in dielectric fluid. The effect produced on the machined surfaces by both processes was reported. The influence of Nb-concentration along with the EDC key parameters (Ip and Ton) on the coated surface integrity such as surface topography, micro-cracks, coating layer thickness, coating deposition, micro-hardness has been evaluated as well. It has been noticed that in the EDC process the high peak current and high Nb-powder concentration allow improvement in the material migration, and a crack-free thick layer (215 μm) on the workpiece surface is deposited. The presence of various oxides and carbides on the coated surface further enhanced the mechanical properties, especially, the wear resistance, corrosion resistance and bioactivity. The surface hardness of the coated layer is increased from 365 HV to 1465 HV. Furthermore, the coated layer reveals a higher adhesion strength (~118 N), which permits to enhance the wear resistance of the Ti-64 alloy. This proposed technology allows modification of the mechanical properties and surface characteristics according to an orthopedic implant’s requirements.

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KINAL, Grzegorz, and Marta PACZKOWSKA. "EVALUATION OF THE HOMOGENEITY OF THE WORKING SURFACE OF CAST IRON BRAKE DISCS." Tribologia 276, no. 6 (December 31, 2017): 33–37. http://dx.doi.org/10.5604/01.3001.0010.8056.

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This article deals with the one of the most important elements of modern braking systems, which is a brake disc. A brake disc is the one of more stressed parts of the braking system, and its quality and design largely determine the braking performance of the vehicle. The article describes the technology of manufacturing disc brake pads that is important from the point of view of the wear processes occurring between two friction surfaces: the brake disc and the brake pad lining. The research of the cast iron ventilated brake disc surface measured the values of the selected roughness parameters at this site. In the context of measurements, it was also determined to be able to maintain a certain value of selected geometric parameters at a given location for the group of brake discs tested of a specific type and manufactured by a particular manufacturer. The work was carried out in the aspect of the research to create a surface layer to protect the brake discs from the effects of corrosive wear.

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Kausar, Ayesha. "Nanodiamond reinforcement in polyamide and polyimide matrices: Fundamentals and applications." Journal of Plastic Film & Sheeting 34, no. 4 (April 27, 2018): 439–58. http://dx.doi.org/10.1177/8756087918773521.

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Nanodiamond is an emerging nanocarbon material having several advantageous properties (high surface area, mechanical properties, optical features, wear resistance, low friction coefficient, etc.) as a nano-sized filler for polymer matrices. Polyamides and polyimides are two important thermoplastic polymers which are among important matrices for nanodiamond composites. Polyamides have high thermal stability, mechanical strength, wear resistance, superior tribological properties, and fine processability. Many aliphatic polyamides, such as polyamide 6, polyamide 6,6, polyamide11, polyamide 12, and several aromatic polyamides have been reinforced with nanodiamond to further enhance their engineering properties. Similarly, outstanding mechanical, thermal, optical, and electrical properties of aromatic polyimides have been enhanced by using nanodiamond particles. Surface nanodiamond modification with various functional groups has been achieved to enhance interfacial adhesion with the matrix, which in turn, improved the physical properties. Polyamide/nanodiamond nanocomposites and polyimide/nanodiamond nanocomposites have been prepared using in situ reactive polymerization, melt extrusion, solution processing, and other techniques. The improved electrical, mechanical, thermal, and biomedical properties render them potentially important materials for various technical applications including energy storage, membrane technology, coatings, and biomedical.

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Li, Junxia, and Shaowei Liang. "Friction and wear of the middle trough in scraper conveyors." Industrial Lubrication and Tribology 70, no. 6 (August 13, 2018): 1072–77. http://dx.doi.org/10.1108/ilt-08-2017-0231.

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Purpose The study of the friction law and wear characteristics of the middle trough material can better select the appropriate material for the scraper conveyor of fully mechanized working face and provide theoretical support for the wear-resistant treatment technology. Design/methodology/approach This paper investigated friction and wear of the middle trough in a scraper conveyor under different media. Lignite, coking coal and anthracite were selected media, and middle trough wear was maximum for anthracite and minimum for lignite, with coking coal being intermediate. Findings Wear increased linearly with increasing load nonlinearly with increasing sliding speed. Middle trough wear also increased with increasing media granularity up to approximately 0.4 mm (40 mesh), but had little effect beyond that. Originality/value It can provide a reference for the scraper conveyor running resistance. At the same time, it has great social significance and economic benefits for the safe, green and efficient coal mine industrial adjustment, etc.

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Williams, S., J. L. Tipper, E. Ingham, M. H. Stone, and J. Fisher. "In vitro analysis of the wear, wear debris and biological activity of surface-engineered coatings for use in metal-on-metal total hip replacements." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 217, no. 3 (March 1, 2003): 155–63. http://dx.doi.org/10.1243/095441103765212659.

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Extremely low wear rates have been reported for metal-on-metal total hip replacements, but concerns remain about the effects of metal ion release, dissolution rates and toxicity. Surface-engineered coatings have the potential to improve wear resistance and reduce the biological activity of the wear debris produced. The aim of this study was to examine the wear and wear debris generation from surface-engineered coatings: titanium nitride (TiN), chromium nitride (CrN) and chromium carbon nitride (CrCN) applied to a cobalt-chrome alloy (CoCr) substrate. The coatings were articulated against themselves in a simple geometry model. The wear particles generated were characterized and the cytotoxic effect on U937 macrophages and L929 fibroblasts assessed. The CrN and CrCN coatings showed a decrease in wear compared to the CoCr bearings and produced small (less than 40 nm in length) wear particles. The wear particles released from the surface engineered bearings also showed a decreased cytotoxic effect on cells compared to the CoCr alloy debris. The reduced wear volumes coupled with the reduced cytotoxicity per unit volume of wear indicate the potential for the clinical application of this technology.

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Monetti, C., S. Ilo, and T. Lebersorger. "Characterization of lubricants for metal forming by means of an oscillating tribo-test-rig." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 223, no. 5 (April 30, 2009): 817–26. http://dx.doi.org/10.1243/13506501jet541.

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Cold metal forming is a versatile and very efficient technology in the manufacture of metal components. In cold metal forming processes high pressure is generated at the tool-workpiece interface, so that good lubrication is required to reduce wear. This improves tool life and the quality of products. The lubricants used in the forming processes usually contain appropriate basis oils with anti-wear (AW) and extreme pressure (EP) additives. In order to examine how wear occurs during cold metal forming, the SRV (Schwingung Reibung Verschleiss) reciprocating-sliding tribometer equipped with a cylinder-on-disc line- contact testing system was adapted and used to characterize lubricant behaviour. Friction coefficient and wear rate were determined under progressively increasing load conditions. The final worn volumes of the flat and the cylinder were evaluated by using optical microscopy methods. The measurement system was validated by replicate tests using some commercially available forming lubricants as reference in a load range of 100-1000 N. The oscillating tribo-test-rig can be used to characterize lubricants for cold metal forming processes by testing the combined effects of different additive systems and their interaction with contacting materials.

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Lee, Jae Hong, Kyun Tak Kim, and Yeong Sik Kim. "Wear Behavior of Al/SiC Composite Coatings According to Sliding Speed and Applied Load." Applied Mechanics and Materials 152-154 (January 2012): 216–19. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.216.

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Thermal spray technology allows providing wear-resistant coating on the surface of mechanical components. In this study, wear characteristics of thermally sprayed Al/SiC composite coatings were evaluated. These Al/SiC composite coatings reinforced with SiC particles were fabricated on Al 6061 substrate by thermal spray process. Dry sliding wear tests were performed using the varied sliding speeds and applied loads. Wear behavior of these Al/SiC composite coatings were investigated using scanning electron microscope(SEM), energy dispersive X-ray spectroscopy(EDX) and X-ray diffraction(XRD).

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Švejcar, Jiří, Ladislav Čelko, Emil Dvořáček, Lenka Klakurková, Martin Juliš, Karel Slámečka, and Josef Zapletal. "Thermal Spray Technology and Casting in Renovation of Friction Bearings Surface." Materials Science Forum 782 (April 2014): 573–77. http://dx.doi.org/10.4028/www.scientific.net/msf.782.573.

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The contribution deals with an analysis of thick wear-resistant coatings produced on the surface of cast iron friction bearings by means of twin wire arc spraying or by pouring, with the aim of comparing the two manufacturing technologies. In addition to a detailed analysis of the microstructure and phase composition of the two types of coating, their mechanical and adhesion properties were established (using tensile and shear stress testing methods as well as cyclic thermal shocks).

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Journal articles on the topic 'Surfaces (Technology) Mechanical wear'

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