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Schrader, Tobias, Ulf Engel y Marion Merklein. "Tribological Characterization of PVD-Coatings". Key Engineering Materials 438 (mayo de 2010): 179–86. http://dx.doi.org/10.4028/www.scientific.net/kem.438.179.
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In cold forging processes the high tribological and mechanical loads often lead to early tool failure. If the cause of failure is wear, an extension of tool life could be achieved by the application of PVD coatings. In industrial tools there is a great variety of load cases that causes wear. Therefore a lot of coatings with different properties are necessary, which need to be adjusted to the various applications. In order to adapt the coatings appropriately to the different processes, a sufficient characterization of the coatings is required. In this paper three new types of PVD coatings based on TiC, AlCrN and TiAlN and two reference PVD coatings based on TiN and TiAlCN are investigated. Since friction plays an important role for the tribological conditions between workpiece and tool, the friction factor m of the coatings is determined for different lubricants in the so called Double Cup Extrusion (DCE) test. A major influence of the lubricants and a minor influence of the coatings can be seen in the conducted tests. Furthermore wear behavior of the coatings is investigated with a so called combined Punching-Forward Extrusion (CPFE) test. In this test it is possible to test simultaneously coated dies and punches under realistic conditions. For the new coating (TiAlN), characterized by monolayer structure, there is wear debris visible in some regions of the die shoulder. The early occurrence of wear might be caused by the ductility of the coating or adherence problems. The other new coatings (TiC and AlCrN), which have a multilayer structure, are revealing excellent wear behavior. The high wear resistance of these two coatings can be explained with their high hardness in combination with a special layer composition.
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Madej, Monika. "Tribological Properties of Diamond-Like Carbon Coatings". Advanced Materials Research 874 (enero de 2014): 9–15. http://dx.doi.org/10.4028/www.scientific.net/amr.874.9.
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The aim of the study was to analyze the superhard anti-wear diamond-like carbon coatings produced by Plasma Assisted Chemical Vapor Deposition (PACVD) and Physical Vapour Deposition (PVD). The a-C:H and a-C:H:W coatings were deposited on steel elements operating under friction conditions. The analysis involved comparing the tribological properties of coated metal elements with those of uncoated elements. It was essential to analyze how the coating composition and structure influence the tribological behaviour of elements under dry and lubrication friction conditions. The coating structure was analyzed by observing the topography of the surface and the cross-sections using an atomic force microscope (AFM) and a scanning electron microscope (SEM). The results were employed to determine the elemental composition and thickness of the coatings. The tribological tests were performed applying a ball-on-disc tribometer and using a pin-on-plate tribometer. The tribological properties were analyzed also in a micro scale using a microtribometer. Compared with the substrate material - steel, the diamond-like carbon coatings showed lower linear wear, lower friction coefficient and higher hardness.
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Shi, Bai Jun, Yuan Ping Peng, Si Chi Wu y Hang Li. "Research on Microstructure and Tribological Properties of Cr-Based Hard Coatings". Advanced Materials Research 811 (septiembre de 2013): 126–30. http://dx.doi.org/10.4028/www.scientific.net/amr.811.126.
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In this paper, three kinds of Cr-based hard coatings have been studied for its structural, mechanical and tribological properties at room temperature. By the technology of closed field unbalanced magnetron sputter ion plating (CFUMSIP), CrN CrAlN and CrTiAlN hard coatings were deposited onto DC53 cold die steel and silicon (100) substrate. The coatings were characterized by means of field emission scanning electron microscopy (FESEM), X-ray diffractometer (XRD), microhardness tester, optical microscope and ball-on-disc tribometer, in order to check their structural, as well as to determine the mechanical and tribological properties. The experimental results showed that the CrTiAlN coating performed better than the CrN coating and the CrAlN coating in terms of mechanical and tribological properties. The wear resistances of CrN, CrAlN and CrTiAlN coatings have been significantly improved compared with DC53 steel substrate.
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Gadhari, Prasanna y Prasanta Sahoo. "Electroless Nickel-Phosphorus Composite Coatings". International Journal of Manufacturing, Materials, and Mechanical Engineering 6, n.º 1 (enero de 2016): 14–50. http://dx.doi.org/10.4018/ijmmme.2016010102.
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Electroless nickel composite coatings possess excellent mechanical and tribological properties such as, hardness, wear and corrosion resistance. Composite coatings can easily be coated not only on electrically conductive materials but also on non-conductive materials like as fabrics, plastics, rubber, etc. This review emphasizes on the development of electroless nickel composite coatings by incorporating different types of hard/soft particles (micro/nano size) in the electroless Ni-P matrix to improve the mechanical and tribological properties of the coatings. The preparation of electroless bath for nickel-phosphorus composite coating, methods to incorporate hard and/or soft particles in the bath, factors affecting the particle incorporation in the coating and its effect on coating structure, hardness, wear resistance, friction behavior, corrosion resistance, and mechanical properties are discussed thoroughly.
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Zhang, Ya Gang, Wan Chang Sun, Min Ma, Sha Sha Tian, Yu Wan Liu, Yan Xiao y Rui Kai Xia. "Tribological Behavior of Co-WC Composite Coatings". Materials Science Forum 996 (junio de 2020): 173–78. http://dx.doi.org/10.4028/www.scientific.net/msf.996.173.
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A novel Co-WC composite coating was deposited on the surface of high speed steel (HSS) substrate by an energy-efficient method of electrodeposition. The effects of process parameters on friction and wear properties of the composite coatings were evaluated, and the worn morphologies of Co-WC composite coatings were investigated by scanning electron microscopy. Results revealed that the incorporation of WC particles can significantly improve the wear resistance of the coating. As the current density was increased to 6.5Adm-2 and the WC concentration was increased to 35g/L, the Co-WC composite coating had the lowest friction coefficient and wear loss.
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Geng, Zhe, Huadong Huang, Baoshan Lu, Shaohua Wu y Gaolian Shi. "Tribological behaviour of low-pressure plasma sprayed WC-Co coatings at elevated temperatures". Industrial Lubrication and Tribology 71, n.º 2 (11 de marzo de 2019): 258–66. http://dx.doi.org/10.1108/ilt-05-2018-0194.
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Purpose This paper aims to investigate the effect of coating microstructure, mechanical and oxidation property on the tribological behaviour of low-pressure plasma spraying (LPPS) tungsten carbide/cobalt (WC-Co) coatings. Design/methodology/approach WC-12Co and WC-17Co coatings were deposited via the LPPS spraying method. Tribological tests on the coatings were performed using a high-temperature ball-on-disc tribometer at temperatures from room temperature (RT, approximately 25 °C) up to 800 °C in ambient air. Findings WC-12Co coating contained brittle phases, pores and microcracks, which led to the low hardness, and finally promoted the splat delamination and the carbide debonding during wear. WC-17Co coating had higher cobalt content which benefited the coating to contain more WC particles, less brittle phases, pores and nearly no microcracks, and resulted in the high hardness and better wear resistance. Higher cobalt content also decelerated the oxidation rate of the coating and promoted the formation of cobalt oxides and CoWO4, which were able to maintain the load-bearing capacity and improve the tribological behaviour of the coating below 650°C. Above 650°C, the increase of oxidation degree and the decrease of mechanical property deteriorated the wear resistance of coatings. Originality/value The LPPS WC-Co coating with higher cobalt content had better tribological properties at different temperatures. The LPPS WC-Co coatings should not be used as wear-resistant coatings above 650 °C.
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Bartuli, C., T. Valente, F. Casadei y M. Tului. "Advanced thermal spray coatings for tribological applications". Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 221, n.º 3 (1 de julio de 2007): 175–85. http://dx.doi.org/10.1243/14644207jmda135.
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Thermal spray coating is one of the most common procedures to improve the tribological properties of materials. Ceramic and cermet coatings, especially those based on oxides (alumina, chromium oxide, etc.) and carbides, are widely used for wear protection. Improvements under investigations are related to the possible use of nanostructured coatings and to the potential application of hybrid techniques. As a possible alternative, solid lubrication is proposed as integration or replacement of the traditional liquid lubrication in the case of severe operative conditions when there is the possibility of a lack of lubricant or when environmental problems can arise from waste disposal. In the present paper, results from experimental activities on different types of abrasion-resistant thermal spray coatings are presented: graded coating systems, specifically designed for titanium-based alloys, obtained by reactive plasma spraying and physical vapour deposition of titanium nitrides; nanostructured WC-Co coatings deposited by high velocity oxy-fuel; plasma-sprayed ceramic coatings based on oxides containing nanophases either from nanostructured precursors or postprecipitated by purposely designed thermal treatments; self-lubricant coatings deposited by plasma spray with the inclusion of graphite.
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Constantin, Lidia R., Anca C. Parau, Mihai Balaceanu, Mihaela Dinu y Alina Vladescu. "Corrosion and tribological behaviour in a 3.5% NaCl solution of vacuum arc deposited ZrCN and Zr–Cr–Si–C–N coatings". Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, n.º 1 (27 de abril de 2018): 158–69. http://dx.doi.org/10.1177/1350650118774132.
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ZrCN and Zr–Cr–Si–C–N coatings were deposited on Si (100) and 316L stainless steel substrates using the cathodic vacuum arc technique in a mixed atmosphere of C2H2 and N2. The coatings were grown keeping almost constant the ratio of the C2H2 and N2 mass flow rates, substrate bias and deposition temperature at ∼0.81, −200 V and 320 ℃, respectively. The investigation carried out aimed to determine the corrosion and tribological performance of the novel Zr–Cr–Si–C–N coating obtained by Cr and Si addition to the ZrCN reference coating. The films were characterized in terms of elemental and phase composition, crystalline structure, hardness, reduced elastic modulus and adhesion. Particular attention was devoted to the investigation of coatings' corrosion resistance and tribological performance carried out in a 3.5% NaCl solution. Cr and Si addition to ZrCN coating leads to reduction in film crystallinity, finer microstructure, enhanced corrosion resistance and better tribological performance under corrosive testing conditions. In this paper, we discuss the measured mechanical and tribological properties of the two coatings in terms of various ratios of hardness and reduced elastic modulus. The coated samples exhibited high corrosion protection efficiency, reaching 97.8% for the Zr–Cr–Si–C–N coating. Both coatings improved the tribological performance of 316L steel in the saline solution. Specifically, the addition of Cr and Si into ZrCN coating results in a decrease of the wear rate of about 60%.
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Kang, S. S., J. M. Dubois y J. von Stebut. "Tribological properties of quasicrystalline coatings". Journal of Materials Research 8, n.º 10 (octubre de 1993): 2471–81. http://dx.doi.org/10.1557/jmr.1993.2471.
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Coatings of three different compositions (Al65Cu20Fe15, Al64Cu18Fe8Cr8, and Al67Cu9Fe10.5Cr10.5Si3) were realized by various thermal deposition techniques. They were studied in the as-deposited state and after annealing. In view of potential applications, these quasicrystalline coatings were examined from the point of view of tribology: friction and wear. Some basic components of friction such as roughness, plowing, and adhesion have been studied in scratch testing. The friction resistance of the coating is strongly dependent on its inherent porosity, hardness, and thickness. The damage of the coatings is essentially brittle though some ductile behavior is observed. Static indentation hardness is in the range 500–600 HV0.03 (5–6 GPa), whereas the scratch hardness varies from 1.4 to 2.4 GPa depending on the percentage of porosity. Friction coefficients (measured at constant load of 20 N) were found to be typically 0.07 and 0.20 for diamond (tip radius R = 0.79 mm) and AISI 52100 (radius R = 0.79 mm) indenters, respectively.
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Mateen, A., Fazal Ahmad Khalid, T. I. Khan y G. C. Saha. "Wear Behaviour of HVOF Sprayed WC-Cobalt Coatings". Advanced Materials Research 326 (septiembre de 2011): 144–50. http://dx.doi.org/10.4028/www.scientific.net/amr.326.144.
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Tungsten carbide cobalt coating has been extensively used for cutting and mining tools, aerospace, automotive and other wear resistance applications. These coatings not only have superior mechanical properties like high hardness, toughness and compressive strength but have also excellent controllable tribological properties. In this paper a comparison of wear properties and structural phases has been presented to consider for tribological applications. It is found that nanocrystalline duplex coatings have shown much superior properties as compared to the microcrystalline coatings. Evidence of clusters of WC particles was found in microcrystalline coating as compared to homogeneous dense coating structure observed in the nanocrystalline coating. These results are discussed to assess their suitability for super hard wear resistance applications.
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Ying, Li Xia, Jun Tao Yang, Ying Liu, Zhi Kun Yang y Gui Xiang Wang. "Electrodeposition and Tribological Properties of Self-Lubricating Sn-Ni-PTFE Composite Coating". Key Engineering Materials 572 (septiembre de 2013): 277–80. http://dx.doi.org/10.4028/www.scientific.net/kem.572.277.
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In order to improve the self-lubricating and anti-wear performances of metal surfaces in the extreme conditions, Sn-Ni-PTFE composite coating was electrodeposited on metal surfaces from the electrolyte containing PTFE emulsion. Microstructure, microhardness and tribological properties of the Sn-NiPTFE composite coatings were investigated. Results show that Sn-Ni-PTFE composite coating has smooth surface and fine microstructure. PTFE particles disperse uniformly in the composite coatings. Simultaneously, the incorporation of PTFE particles significantly improves the tribological performance of Sn-Ni coatings. SnNiPTFE composite coatings exhibits lower friction coefficient and better wear resistance in contrast with Sn-Ni coating.
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Szparaga, Łukasz, Przemysław Bartosik, Adam Gilewicz, Katarzyna Mydłowska y Jerzy Ratajski. "Optimisation of Mechanical Properties of Gradient Zr–C Coatings". Materials 14, n.º 2 (8 de enero de 2021): 296. http://dx.doi.org/10.3390/ma14020296.
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One of the key components of the designing procedure of a structure of hard anti-wear coatings deposited via Physical Vapour Deposition (PVD) is the analysis of the stress and strain distributions in the substrate/coating systems, initiated during the deposition process and by external mechanical loads. Knowledge of residual stress development is crucial due to their significant influence on the mechanical and tribological properties of such layer systems. The main goal of the work is to find the optimal functionally graded material (FGM) coating’s structure, composed of three functional layers: (1) adhesive layer, providing high adhesion of the coating to the substrate, (2) gradient load support and crack deflection layer, improving hardness and enhancing fracture toughness, (3) wear-resistant top layer, reducing wear. In the optimisation procedure of the coating’s structure, seven decision criteria basing on the state of residual stresses and strains in the substrate/coating system were proposed. Using finite element simulations and postulated criteria, the thickness and composition gradients of the transition layer in FGM coating were determined. In order to verify the proposed optimisation procedure, Zr-C coatings with different spatial distribution of carbon concentration were produced by the Reactive Magnetron Sputtering PVD (RMS PVD) method and their anti-wear properties were assessed by scratch test and ball-on-disc tribological test.
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Szparaga, Łukasz, Przemysław Bartosik, Adam Gilewicz, Katarzyna Mydłowska y Jerzy Ratajski. "Optimisation of Mechanical Properties of Gradient Zr–C Coatings". Materials 14, n.º 2 (8 de enero de 2021): 296. http://dx.doi.org/10.3390/ma14020296.
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One of the key components of the designing procedure of a structure of hard anti-wear coatings deposited via Physical Vapour Deposition (PVD) is the analysis of the stress and strain distributions in the substrate/coating systems, initiated during the deposition process and by external mechanical loads. Knowledge of residual stress development is crucial due to their significant influence on the mechanical and tribological properties of such layer systems. The main goal of the work is to find the optimal functionally graded material (FGM) coating’s structure, composed of three functional layers: (1) adhesive layer, providing high adhesion of the coating to the substrate, (2) gradient load support and crack deflection layer, improving hardness and enhancing fracture toughness, (3) wear-resistant top layer, reducing wear. In the optimisation procedure of the coating’s structure, seven decision criteria basing on the state of residual stresses and strains in the substrate/coating system were proposed. Using finite element simulations and postulated criteria, the thickness and composition gradients of the transition layer in FGM coating were determined. In order to verify the proposed optimisation procedure, Zr-C coatings with different spatial distribution of carbon concentration were produced by the Reactive Magnetron Sputtering PVD (RMS PVD) method and their anti-wear properties were assessed by scratch test and ball-on-disc tribological test.
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Ahmed, R., O. Ali, C. C. Berndt y A. Fardan. "Sliding Wear of Conventional and Suspension Sprayed Nanocomposite WC-Co Coatings: An Invited Review". Journal of Thermal Spray Technology 30, n.º 4 (abril de 2021): 800–861. http://dx.doi.org/10.1007/s11666-021-01185-z.
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AbstractThe global thermal spray coatings market was valued at USD 10.1 billion in 2019 and is expected to grow at a compound annual growth rate of 3.9% from 2020 to 2027. Carbide coatings form an essential segment of this market and provide cost-effective and environmental friendly tribological solutions for applications in aerospace, industrial gas turbine, automotive, printing, oil and gas, steel, and pulp and paper industries. Almost 23% of the world’s total energy consumption originates from tribological contacts. Thermal spray WC-Co coatings provide excellent wear resistance for industrial applications in sliding and rolling contacts. Some of these applications in abrasive, sliding and erosive conditions include sink rolls in zinc pots, conveyor screws, pump housings, impeller shafts, aircraft flap tracks, cam followers and expansion joints. These coatings are considered as a replacement of the hazardous chrome plating for tribological applications. The microstructure of thermal spray coatings is however complex, and the wear mechanisms and wear rates vary significantly when compared to cemented WC-Co carbides or vapour deposition WC coatings. This paper provides an expert review of the tribological considerations that dictate the sliding wear performance of thermal spray WC-Co coatings. Structure–property relationships and failure modes are discussed to grasp the design aspects of WC-Co coatings for tribological applications. Recent developments of suspension sprayed nanocomposite coatings are compared with conventional coatings in terms of performance and failure mechanisms. The dependency of coating microstructure, binder material, carbide size, fracture toughness, post-treatment and hardness on sliding wear performance and test methodology is discussed. Semiempirical mathematical models of wear rate related to the influence of tribological test conditions and coating characteristics are analysed for sliding contacts. Finally, advances for numerical modelling of sliding wear rate are discussed.
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Yeo, Seung Min, Emerson Escobar Nunez y Andreas A. Polycarpou. "Tribological Performances of Polymer-Based Coating Materials Designed for Compressor Applications". Advances in Science and Technology 64 (octubre de 2010): 33–42. http://dx.doi.org/10.4028/www.scientific.net/ast.64.33.
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With increasing importance of advanced coating materials for use in interacting parts of air-conditioning compressors, several commercially available polymer-based coatings (PTFE/ Pyrrolidone-1, 2, PTFE/MoS2-1, 2, Fluorocarbon, PEEK/PTFE and PEEK/Ceramic coatings) were tribologically evaluated. Friction and wear behavior of these coatings, deposited on gray cast iron were in-situ measured using a specialized pin-on-disk tribometer. The experiments were performed under compressor specific conditions, namely under oscillatory motion simulating piston-type compressor and unidirectional motion simulating swash plate-type compressor operation. Also, the tribological properties of newly developed ATSP-based coatings deposited on aluminum substrates were evaluated under ball-on-disk, unidirectional sliding experiments. Polymer-based coatings exhibited excellent frictional properties, while their wear resistance was also acceptable, even though lower compared to hard coatings. However, the wear debris generated at the interface acted as a third-body solid lubricant with a beneficial role in their overall performance. ATSP coatings blended with fluoroadditives showed superior frictional behavior than pure ATSP coatings, and their wear rate was extremely low compared to commercially available PTFE-based coatings.
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Krishna, L. Rama, D. Sen, Y. Srinivasa Rao, G. V. Narasimha Rao y G. Sundararajan. "Thermal spray coating of aluminum nitride utilizing the detonation spray technique". Journal of Materials Research 17, n.º 10 (octubre de 2002): 2514–23. http://dx.doi.org/10.1557/jmr.2002.0366.
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The main objective of this work is to examine the feasibility of depositing aluminum nitride (AlN) powders, synthesized using self-propagating high-temperature synthesis, on a mild steel substrate using the detonation spray coating technique. Thick coatings produced by utilizing the AlN powder were obtained at four different oxygen–acetylene ratios and analyzed for microstructure, microhardness, porosity, indentation fracture toughness, and phase distribution. The AlN powder particles were found to be undergoing oxidation during the deposition process. The interrelationship between the spray parameters and the extent of oxidation of AlN during the coating process was investigated. Tribological performance of the coatings was evaluated using a dry sand abrasion test and a pin-on-disc sliding wear test. The mechanical and tribological properties of the above four coatings were compared with pure alumina (Al2O3) coatings. The correlation between the structure of the coatings and their tribological performance was also established.
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Brezinová, Janette, Dagmar Jakubéczyová y Mariana Landová. "Evaluation of AlTiCrN Coatings Surface after Tribological Tests". Materials Science Forum 818 (mayo de 2015): 49–52. http://dx.doi.org/10.4028/www.scientific.net/msf.818.49.
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The article deals with the issue of evaluation of thin coatings for coating of cutting tools in order to increase their lifetime at higher temperatures. The aim of the experimental work was to determine the quality of two types of coatings - AlTiNmulti and AlTiCrN. The coatings were applied to the material Böhler 190 Microclean using PLATIT PL1001 Compact device at temperature of 430°C and pressure of 0,020 mbar. To determine the quality of coatings tribological test Pin-on-Disc was used, the counterpart was made of tungsten carbide (WC). Outputs of measurements were evaluated in Sensomp, which evaluates the results obtained from measurements using microscope PLu Noex. The results of the tests show that the AlTiNmulti coating is most suitable for use in environments with higher temperatures.
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Fazlalipour, F., M. Niki Nushari, N. Shakib y Ali Shokuhfar. "Comparative Tribological Behavior of V(N,C) and VC Diffusion Coatings". Defect and Diffusion Forum 297-301 (abril de 2010): 1183–89. http://dx.doi.org/10.4028/www.scientific.net/ddf.297-301.1183.
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Hard coatings show various tribological behaviors against different contact materials (counter-faces) during dry sliding depended on their microstructure, surface morphology and encountered tribological systems and condition. In this work, the tribological and wear mechanisms of vanadium carbide (VC) and vanadium nitrocarbide (V(N,C)) layers were examined against WC/Co cemented tungsten carbide pin during pin-on-disk sliding wear testing. The V(N,C) layer was produced by a duplex surface treatment involving the gas pre-nitrocarburising followed by thermo-reactive diffusion (TRD) vanadizing technique. The coating layers were characterized by a cross sectional and morphological examination methods and X-ray diffraction analysis to identify damages of the coating’s surface. Wear mechanisms were determined by SEM microscope in BSI and SE mode accompanied by EDS analysis. Results revealed that the surface morphology of the V(N,C) coating consist of dense and smooth layer in comparison with the VC coating surface which reveals a non-uniform structure with chasms. It was determined that the activation of tribo-chemical system and oxidizing of the coating layer together with minor plastic deformation are the dominant wear mechanism in the V(N,C) coated steel. In the case of the VC coating, combination of abrasive wear and adhesion of pin material to coating and vice versa are the major impairing mechanisms.
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Bull, S. J. "Tribological and Micro-Tribological Phenomena in Coatings". Materials Science Forum 246 (enero de 1997): 105–52. http://dx.doi.org/10.4028/www.scientific.net/msf.246.105.
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Sahoo, Prasanta y Supriyo Roy. "Tribological Behavior of Electroless Ni-P, Ni-P-W and Ni-P-Cu Coatings". International Journal of Surface Engineering and Interdisciplinary Materials Science 5, n.º 1 (enero de 2017): 1–15. http://dx.doi.org/10.4018/ijseims.2017010101.
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The present paper considers the comparative study of tribological characteristics of various electroless alloy coatings viz. Ni-P, Ni-P-W and Ni-P-Cu. The tribological behavior of these coatings depends on various parameters like load, speed, lubricant, chemical compositions and heat treatment temperature to a great extent. One of the main effects of heat treatment on these coatings is phosphide precipitation, which makes them suitable for anti-wear applications. The property of binary Ni-P can be further improved by depositing third particles electrolessly. The phase structure of the coatings depends on the amount of phosphorous and heat treatment temperature. The tribological behavior of heat treated samples reveals that Ni-P-W deposit shows higher coefficient of friction and lowest wear among these three types coatings. Very high tungsten concentration retard the phosphide precipitation, thus low concentration of tungsten and low heat treatment temperature produce better coating. In case of Ni-P-Cu, medium concentration of copper and medium heat treatment temperature produces better coating.
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Xia, Yan Qiu y Xin Feng. "Tribological Behaviors of Nanocrystalline Nickel Coatings under Lubricated Conditions". Advanced Materials Research 291-294 (julio de 2011): 1458–61. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.1458.
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In this paper, nickel coatings (on phosphor bronze substrates) were prepared using pulse electrodeposition method. The friction and wear behaviors of nanocrystalline nickel coating compared with coarse-grained nickel coating against AISI 52100 steel were investigated using l-butyl-3-octylimidazolium tetrafluoroborate ionic liquid and perfluoropolyether as a reference lubricant on reciprocating ball-on-flat UMT-2MT sliding tester. The morphologies of the worn surfaces were observed using a scanning electron microscope. The chemical states of several typical elements on the worn surfaces were examined by means of X-ray photoelectron spectroscopy. The results indicated that NC nickel coatings have better tribological properties than that of coarse-grained nickel coatings under lubricated conditions. This was partly attributed to the high hardness of the NC nickel coating and L-B408 ionic liquid formed tribochemical reaction films under NC nickel coatings.
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Nguyen, Huu Chien, Zdeněk Joska, Zdeněk Pokorný, Zbyněk Studený, Josef Sedlák, Josef Majerík, Emil Svoboda, David Dobrocký, Jiří Procházka y Quang Dung Tran. "Effect of Boron and Vanadium Addition on Friction-Wear Properties of the Coating AlCrN for Special Applications". Materials 14, n.º 16 (18 de agosto de 2021): 4651. http://dx.doi.org/10.3390/ma14164651.
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Cutting tools have long been coated with an AlCrN hard coating system that has good mechanical and tribological qualities. Boron (B) and vanadium (V) additions to AlCrN coatings were studied for their mechanical and tribological properties. Cathodic multi-arc evaporation was used to successfully manufacture the AlCrBN and AlCrVN coatings. These multicomponent coatings were applied to the untreated and plasma-nitrided surfaces of HS6-5-2 and H13 steels, respectively. Nanoindentation and Vickers micro-hardness tests were used to assess the mechanical properties of the materials. Ball-on-flat wear tests with WC-Co balls as counterparts were used to assess the friction-wear capabilities. Nanoindentation tests demonstrated that AlCrBN coating has a higher hardness (HIT 40.9 GPa) than AlCrVN coating (39.3 GPa). Steels’ wear resistance was significantly increased by a hybrid treatment that included plasma nitriding and hard coatings. The wear volume was 3% better for the AlCrBN coating than for the AlCrVN coating on H13 nitrided steel, decreasing by 89% compared to the untreated material. For HS6-5-2 steel, the wear volume was almost the same for both coatings but decreased by 77% compared to the untreated material. Boron addition significantly improved the mechanical, tribological, and adhesive capabilities of the AlCrN coating.
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Baig, M. M. A. y M. Abdul Samad. "Epoxy\Epoxy Composite\Epoxy Hybrid Composite Coatings for Tribological Applications—A Review". Polymers 13, n.º 2 (6 de enero de 2021): 179. http://dx.doi.org/10.3390/polym13020179.
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Epoxy composite coating systems generally find their usage in applications such as, fluid handling systems to protect components from corrosive media. However, their use in demanding tribological applications such as, in sliding components of machines, are known to be limited. This is often attributed to their low load bearing capacity combined with poor thermal stability under severe p-v regimes. Researchers have tried to enhance the tribological properties of the epoxy coatings using a combination of several types of micro/nano sized fillers to produce composite or hybrid composite coatings. Hence, this review paper aims to focus on the recent advances made in developing the epoxy coating systems. Special attention would be paid to the types and properties of nano-fillers that have been commonly used to develop these coatings, different dispersion techniques adopted and the effects that each of these fillers (and their combinations) have on the tribological properties of these coatings.
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Raveen, R., J. Yoganandh, S. SathieshKumar y N. Neelakandeswari. "Preparation and characterization of pulsed electrodeposited cobalt–graphene nanocomposite coatings". Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 233, n.º 12 (25 de julio de 2019): 2469–77. http://dx.doi.org/10.1177/1464420719863462.
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Cobalt–graphene nanocomposite coatings possess unique mechanical and tribological properties which attract researchers to explore its potential for various industrial applications. This research work presents the investigation on cobalt–graphene nanocomposite coatings, with two different graphene compositions cobalt–graphene (0.15 and 0.45 wt%) prepared by pulsed electrodeposition from aqueous bath involving cobalt chloride, trisodium citrate, and citric acid on low carbon steel substrate. Studies on coating morphology, microhardness, tribological characteristics such as wear and corrosion for the cobalt–graphene nanocomposite coatings were reported. Cobalt–graphene (0.45 wt%) nanocomposite coating which exhibits low wear rate in all load conditions due to the self-lubricating property of graphene and cobalt–graphene (0.15 wt%) nanocomposite coating shows higher corrosion resistance due to its layered cauliflower surface morphology.
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Kacprzyńska-Gołacka, Joanna, Jerzy Smolik, Adam Mazurkiewicz, Jan Bujak, Halina Garbacz y Piotr Wieciński. "The Influence of Microstructure of Nanomultilayer AlN-CrN-TiN Coatings on their Tribological Properties at Elevated Temperature". Solid State Phenomena 237 (agosto de 2015): 27–33. http://dx.doi.org/10.4028/www.scientific.net/ssp.237.27.
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One of the most effective ways of shaping the operating parameters of functional elements is to modify the properties of a surface layer using modern technologies of surface engineering. The prospective directions in the development of surface engineering solutions are nanomultilayer coatings that enable effective shaping of surface layer properties. A very important factor in designing properties of PVD coatings, apart from their chemical composition, is their microstructure.The paper presents the influence of the microstructure of the nanomultilayer AlN-CrN-TiN coating on their tribological properties at elevated temperatures. The research methods were concentrated on the analysis of mechanical properties, microstructure, and tribological properties at increased temperatures. The studies on mechanical properties included tests on hardness using the nanoindentation method and tests on adhesion using the scratchtest method. The analysis of microstructure was performed using scanning microscopy. The tribological properties at high temperature were examined using the ball-on-disc method. The authors indicate that the AlN-CrN-TiN layers are characterised by excellent mechanical properties and tribological resistance. In this paper, the authors confirm that the microstructure of a nanomultilayer coating is important in shaping the mechanical and tribological properties of a PVD coating.
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Rakhadilov, B. K., D. B. Buitkenov, P. Kowalewski, O. A. Stepanova y D. Kakimzhanov. "MODIFICATION OF COATINGS BASED ON Al2O3 WITH CONCENTRATED ENERGY FLOWS". Series of Geology and Technical Sciences 447, n.º 3 (15 de junio de 2021): 118–23. http://dx.doi.org/10.32014/2021.2518-170x.72.
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This paper presents the study results of structural-phase composition and mechano-tribological properties of Al2O3 coatings after exposure of concentrated energy flows. Revealed that the treated coatings are generally characterized by high microhardness compared to the initial coating. Determined that after treatment with detonation and air-plasma action is observed an increase in the intensity of α-Al2O3 reflexes. Established that the increasing hardness of detonation coatings is associated with an increasing density of the material and the recovery of the α-phase Al2O3 in the composition of the protective layer under the influence of thermal activation of the surface. Determined that after treatment with detonation and plasma exposure is observed an increase in the intensity of reflexes α-Al2O3. Established that the treatment with detonation and air-plasma action leads to a decrease in the friction coefficient. The obtained data indicate that the tribological characteristics of coating based on aluminium oxide can be improved by exposure to concentrated energy flows. Established that coatings treated with plasma action showed high tribological properties.
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Klekotka, Marcin, Katarzyna Zielińska, Alicja Stankiewicz y Michal Kuciej. "Tribological and Anticorrosion Performance of Electroplated Zinc Based Nanocomposite Coatings". Coatings 10, n.º 6 (24 de junio de 2020): 594. http://dx.doi.org/10.3390/coatings10060594.
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This paper presents the results of corrosion and tribological analysis of pure and nanocomposite zinc coatings. Coatings were electroplated using commercially available products—zinc acidic bath and a nanoparticle carrying plating additive. Electrochemical measurements were carried out to compare the anticorrosion performance of coatings. An investigation into the influence of nanoparticles on the mechanical properties was performed. The zinc nanocomposite coating exhibited better wear resistance and higher hardness than the plain zinc coating. The application of confocal laser scanning microscopy (CLSM) allowed the detailed description of friction/wear marks. The electrochemical studies revealed that the introduction of nanoparticles into the coating did not compromise its protective properties—a similar resistance of plain and nanocomposite coatings to corrosion was obtained.
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Bara, Marek y Renata Dwornicka. "Tribological Properties of Oxide Coatings Produced on EN AW-5251 Alloy using Different Distances between Electrodes". Quality Production Improvement - QPI 1, n.º 1 (1 de julio de 2019): 400–405. http://dx.doi.org/10.2478/cqpi-2019-0054.
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Abstract The subject of the presented work was the analysis of the influence of the distance between the electrodes using in the coating process on the tribological properties of oxide coatings. Oxide coatings were prepared on EN AW-5251 aluminum alloy samples. The samples surfaces were subjected to hard anodizing process in a multicomponent electrolyte based on sulfuric acid with an addition of organic acids. Anodizing was carried out with a constant electric charge density of 180 A·min/dm2. The distances between the electrodes for subsequent samples increased every 0.125 m up to 1 m. The tribological partner in a sliding couple with oxide layers was pin of PEEK/BG. Tribological tests were conducted on a T-17 tester in reciprocating motion, in technically dry friction conditions. Before and after tribological test, examination of the geometrical structure of counter-specimens’ surface was carried out using the Form Talysurf contact profilographometer, via a 3D method. The most satisfactory tribological parameters were obtained for the PEEK/BG association with the coating produced at a distance between the electrodes equal to 0.25 m.
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Mukhopadhyay, Arkadeb, Tapan Barman, Prasanta Sahoo y J. Davim. "Comparative Study of Tribological Behavior of Electroless Ni–B, Ni–B–Mo, and Ni–B–W Coatings at Room and High Temperatures". Lubricants 6, n.º 3 (2 de agosto de 2018): 67. http://dx.doi.org/10.3390/lubricants6030067.
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Ni–B alloys deposited by the electroless method are considered to be hard variants of the electroless nickel family. Inclusion of Mo or W to form ternary alloys improves the thermal stability of electroless nickel coatings. Therefore, in the present work, Ni–B, Ni–B–Mo, and Ni–B–W coatings are deposited; and their tribological behavior at room and high temperatures are investigated. Electroless Ni–B, Ni–B–Mo, and Ni–B–W coatings are deposited on AISI 1040 steel substrates. The coatings are heat treated to improve their mechanical properties and crystallinity. Tribological behavior of the coatings is determined on a pin-on-disc type tribological test setup using various applied normal loads (10–50 N) and sliding speeds (0.25–0.42 m/s) to measure wear and coefficient of friction at different operating temperatures (25 °C–500 °C). Ni–B–W coatings are observed to have higher wear resistance than Ni–B or Ni–B–Mo coatings throughout the temperature range considered. Although for coefficient of friction, no such trend is observed. The worn surface of the coatings at 500 °C is characterized by lubricious oxide glazes, which lead to enhanced tribological behavior compared with that at 100 °C. A study of the coating characteristics such as composition, phase transformations, surface morphology, and microhardness is also carried out prior to tribological tests.
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Makówka, M. y B. Wendler. "Carbon based coatings for applications in friction couples with bearing steel and aluminium alloy". Archives of Materials Science and Engineering 1, n.º 87 (1 de septiembre de 2017): 12–20. http://dx.doi.org/10.5604/01.3001.0010.5966.
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Purpose: Low friction nc-WC/a-C:H coatings deposited by means of magnetron sputtering provide very good tribological properties in friction couple against hard steels and good adhesion to steel substrates. Nevertheless, it was necessary to elaborate a new type of coatings because the nc-WC/a-C:H one had no use in friction couple against aluminium alloys. Design/methodology/approach: In the paper the WC/a-C:H and (Si, Cr)C/a-C:H coatings were investigated. The coatings were investigated by means of SEM, EDS, in order to obtain thickness, surface morphology and chemical composition of coatings. Tribological properties of deposited coatings were elaborated by means of 'pin-on-disc' method in friction couple against 100Cr6 bearing steel and AlSi alloy. Findings: It was stated that (Si, Cr)C/a-C:H coatings have very good tribological properties in friction couple against bearing steel and AlSi alloy (friction coefficient <0,1). In case of WC/a-C:H coatings, good tribological properties were achieved in friction couple with bearing steel. Both coatings have very low wear rate in investigated friction couples. Research limitations/implications: The (Si,Cr)C/a-C:H coating have a worse quality of adhesion to quenched and tempered Vanadis 23 HS steel substrate in comparison with the nc-WC/a-C:H coating. Resolving this disadvantage can increase potential of application of (Si, Cr)C/a-C:H coatings. Practical implications: Newly developed (Si, Cr)C/a-C:H coating has a greater application potential for modification of surfaces of elements working in friction couples against hardened steels and light alloys like AlSi. Originality/value: There are numerous publications where low friction carbon based coatings were described mostly as a coatings deposited on elements working in friction couples against hard steels. Undertaken tests showed that the newly developed (Si,Cr)C/a- C:H coating can have a broad spectrum of applications in friction couples against different counterbodies, including light Al alloys.
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Kao, W. H., Yan Liang Su, Jeng Haur Horng y H. C. Huang. "The Deposition Rate, Hardness and Tribological Properties of a-C:H Coatings with a Tungsten Filament-Assisted Ionized Reaction Gas ". Key Engineering Materials 642 (abril de 2015): 135–40. http://dx.doi.org/10.4028/www.scientific.net/kem.642.135.
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The a-C:H coatings were deposited on AISI M2 steel disks using an unbalanced magnetron sputtering technique with a single titanium metal target, three graphite targets and mixed methane/ acetylene reactive gas. The various currents (9A-17A) were applied to the tungsten filament to enhance ionization rate of reactive gas. Tribological properties of a-C:H coatings were conducted used reciprocating friction tester. The results show that the tungsten filament current has a significant effect on the deposition rate, hardness and tribological properties of the coatings. With the increase of the tungsten filament current, the deposition rate and hardness of the coating increases, respectively. In sliding against an AISI 52100 steel ball for 24 minutes, all of coatings reduce the wear depth by a factor of at least 11 compared to that observed on an uncoated substrate. The 17A coating yields the best tribological properties that are the minimum wear depth, the lowest friction coefficient and the maximum lifetime when sliding against an AISI 52100 steel ball.
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Liu, Wen Kai, Wei Ping Ma y Xue Cheng Lu. "Tribological Characteristics of Nanostructrued Ceramic Coatings Deposited by Plasma Spraying". Advanced Materials Research 472-475 (febrero de 2012): 2752–55. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.2752.
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Nanostructured Al2O3-13wt.% TiO2 coatings were prepared by plasma spraying using agglomerated nanocrystalline powders via a spray drying method. The as-sprayed coatings and their worn surface were characterized using scanning electron microscope (SEM). The tribological characteristics were evaluated on block-on-ring configuration. It is found that that the nanostructured coating exhibited a unique bimodal microstructure, which has an important influence on the tribological characteristics. The abrasive wear resistance of the nanocoatings are greatly improved compared with the conventional coatings, and the abrasive wear mechanism is also discussed.
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Najar, Kaleem Ahmad, N. A. Sheikh, Mohammad Mursaleen Butt y M. A. Shah. "Enhancing the wear resistance of WC–Co cutting inserts using synthetic diamond coatings". Industrial Lubrication and Tribology 70, n.º 7 (10 de septiembre de 2018): 1224–33. http://dx.doi.org/10.1108/ilt-04-2017-0089.
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Purpose The purpose of this study is to investigate the mechanical and tribological properties of the synthetic diamond coatings deposited on WC-Co cutting tools for their prospective applications in mechanical industry. In this work, the concept of nanocrystalline diamond, microcrystalline diamond and multilayer-diamond coating systems were proposed and deposited on WC-Co substrates with the top-layer nanocrystallinity, optimum thickness and interfacial adhesion strength for load-bearing tribological and machining applications. Also, the overall mechanical and tribological properties of all synthetic diamond coatings were compared for the purpose of selecting a suitable type of protective layer used on the surfaces of WC-Co cutting tools or mechanical dies. Design/methodology/approach Smooth and adhesive single layered and multilayered synthetic deposited on chemically etched cemented tungsten carbide (WC-Co) substrates using predetermined process parameters in hot filament chemical vapor deposition (HFCVD) method. A comparison has been documented between diamond coatings having different nature and architecture for the purpose of studying their mechanical and tribological characteristics. The friction characteristics were studied experimentally using ball-on-disc type linear reciprocating micro-tribometer under the influence of varying load conditions and within dry sliding conditions. Nanoindentation tests were conducted on each diamond coating using Berkovich nanoindenter for the measurement of their hardness and elastic modulus values. Also, the wear characteristics of all sliding bodies were studied under varying load conditions using cumulative weight loss and density method. Findings Depositing any type of diamond coating on the cemented carbide tool insert increases its all mechanical and tribological characteristics. When using boron-doping onto the top-layer surface of diamond coatings decrease slightly their mechanical properties but increases the tribological characteristics. Present analysis reveals that friction coefficient of all diamond-coated WC-Co substrates decreases with the increase of normal load. Therefore, maintaining an appropriate level of normal load, sliding time, sliding distance, atmospheric conditions and type of diamond coating, the friction coefficient may be kept to some lower value to improve mechanical processes. Originality/value As the single layered synthetic diamond coatings have not given the full requirements of mechanical and tribological properties when deposited on cutting tools. Therefore, the multilayered diamond coatings were proposed and developed to enhance the interfacial integrity of the nanocrystalline and microcrystalline layers (by eliminating the sharp interface) as well as increasing the hardness of tungsten carbide substrate. However, when using boron doping onto the top-layer surface of diamond, coatings decreases slightly their mechanical characteristics but also decreases the value of friction coefficient.
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Wang, Xiang, Xiao Dong Sun, Er Yong Liu, Zhi Ming Zhou, Zhi Xiang Zeng y Xue Dong Wu. "Microstructure and Tribological Properties of Ni-Base Coatings under Different Lubrication Conditions". Materials Science Forum 816 (abril de 2015): 54–63. http://dx.doi.org/10.4028/www.scientific.net/msf.816.54.
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In order to improve the tribological properties of aluminum alloy cylinder wall, Ni-base coatings were fabricated by atmospheric plasma spraying on aluminum substrate. The composition, microstructure characterization and tribological properties of Ni-base coatings were investigated under different lubrication conditions. The results showed that as-sprayed Ni-based coatings were mainly consisted of γ-Ni solid solution, Ni3B, Cr7C3, Cr6C and Cr3B2 phase. The microstructure of coatings exhibited excellent deposit integrity and density, whilst a typical lamellar structure was observed because the molten droplets successively impinged and spread on the substrate or previously deposited layers to form continuous splats. Friction and wear testing results showed that Ni-based coating performs better than grey cast iron HT200 for the actual application of cylinder block and cylinder liner, especially under boundary lubrication. It was proposed that the excellent mechanical properties ensure the as-sprayed coating with low friction coefficient and wear rate under different lubrication conditions, In addition, the existence of pores was benefitted for the improvement of tribological properties under boundary lubrication.
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KOT, Marcin, Łukasz MAJOR, Jurgen LACKNER y Kinga CHRONOWSKA-PRZYWARA. "TRIBOLOGICAL PROPERTIES OF TI/A-C:H NANOCOMPOSITE CARBON BASED COATINGS". Tribologia 267, n.º 3 (30 de junio de 2016): 109–17. http://dx.doi.org/10.5604/01.3001.0010.7297.
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The paper presents the results of mechanical and tribological tests of Ti/a-C:H nanocomposite carbon coatings and a-C:H hydrogenated carbon coating. All coatings were deposited by magnetron sputtering technique at various acetylene gas flows in a vacuum chamber, resulting in different coatings properties. The conducted study determines hardness, elasticity modulus, fracture resistance, and tribological properties – wear and friction coefficient of deposited coatings. The lowest wear and coefficient of friction were exhibited coatings deposited at higher acetylene flows, 15-20 sccm. However, they are brittle and the critical load in scratch testing is several times smaller than in a case of softer coatings deposited at lower acetylene flow up to 10 sccm.
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CHRONOWSKA-PRZYWARA, Kinga y Marcin KOT. "ANALYSIS OF FRACTURE AND WEAR RESISTANCE OF ZrN COATINGS". Tribologia 273, n.º 3 (30 de junio de 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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Mukhopadhyay, Arkadeb, Tapan Kumar Barman y Prasanta Sahoo. "Tribological behavior of electroless Ni–B–W coating at room and elevated temperatures". Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 232, n.º 11 (2 de febrero de 2018): 1450–66. http://dx.doi.org/10.1177/1350650118755781.
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Sodium borohydride reduced electroless Ni–B coatings possess high hardness, wear resistance, and low coefficient of friction. They are found to be suitable candidates for wear reduction of mechanical components. In a quest to achieve enhanced tribological behavior and high thermal stability, the present work reports the inclusion of W to Ni–B coatings. Electroless method is employed for Ni–B–W coating deposition on AISI 1040 steel specimens. Post deposition, the coatings are heat treated at 350 ℃, 400 ℃, and 450 ℃. Deposit characterization is carried out using energy-dispersive X-ray analysis, X-ray diffraction, and scanning electron microscopy. Inclusion of W leads to an increase in microhardness and thermal stability of Ni–B coatings. The tribological behavior of as-deposited and heat-treated Ni–B–W coatings are investigated at room and elevated temperatures (100 ℃, 300 ℃, and 500 ℃). Heat-treated coatings show lower wear rate at room temperature compared to as-deposited ones but the coefficient of friction increases. Tribological test results at elevated temperatures suggest an improvement in the wear resistance and coefficient of friction at 300 ℃ and 500 ℃ in comparison with 100 ℃. Phase transformation study post wear test indicate microstructural changes in the coating due to the in situ heat treatment at high temperature. The tribological behavior of the coatings at 100 ℃ and 300 ℃ is mainly governed by the loose wear debris and formation of debris patches, respectively. Whereas at 500 ℃, formation of protective tribo-oxide patches is also observed.
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Albagachiev, A. Yu, M. E. Stavroskii y M. I. Sidorov. "Tribological Wear-Preventive Coatings". Journal of Machinery Manufacture and Reliability 49, n.º 1 (enero de 2020): 57–63. http://dx.doi.org/10.3103/s1052618820010033.
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Park, In Wook, Jianliang Lin, William C. Moerbe, Brajendra Mishra, John J. Moore, Jennifer M. Anton, William D. Sproul et al. "Nanostructured, multifunctional tribological coatings". International Journal of Nanomanufacturing 1, n.º 3 (2007): 399. http://dx.doi.org/10.1504/ijnm.2007.013694.
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Gärtner, W. "Soft metallic tribological coatings". Vacuum 40, n.º 1-2 (enero de 1990): 224. http://dx.doi.org/10.1016/0042-207x(90)90167-w.
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Störi, H. "Tribological and protective coatings". Vacuum 41, n.º 4-6 (enero de 1990): 1477. http://dx.doi.org/10.1016/0042-207x(90)93996-v.
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Zhao, Yuncai, Fei Yang y 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, n.º 1 (9 de febrero de 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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Migranov, Mars y Regina Migranov. "Tool Coatings with the Effect of Adaptation to Cutting Conditions". Key Engineering Materials 496 (diciembre de 2011): 75–79. http://dx.doi.org/10.4028/www.scientific.net/kem.496.75.
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The objective of the present work is to study tribological properties of multilayered wear resistant coatings on the cutting tools. Two types of coatings (TiAl)N were studied: normal monolayer coating and improved coating. The tests were conducted with cooling, and without it. During high speed machining an intensive tribo-oxidation of tool surface occurs. Formation of aluminum oxide films on the surface of cutting tool significantly changes the heat flow and heat dissipation into the chip. Conditions of the chips formation (chip thickness ratio and the shear plane angle) and the coefficient of friction on the rake face of the cutting tool have been measured during the cutting process. The results demonstrated significant improvement of tribological parameters for the cutting tools with filtered coatings.
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Hagarová, Mária, Dagmar Jakubéczyová, Pavol Hvizdoš, Zuzana Fečková, Marek Vojtko y Gabriel Dúl. "The Influence of Current Density on Tribological Behavior Ni-Co Electroplated Coatings". Key Engineering Materials 635 (diciembre de 2014): 127–30. http://dx.doi.org/10.4028/www.scientific.net/kem.635.127.
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Nowadays, more and more scientific studies deal with the formation of electroplating alloy coatings due to the possibility of combination and share content type metal – forming alloy. To produce coatings that fulfil pre-defined specific requirements is possible by a suitable combination of process conditions. The paper deals with the study of tribological properties of Ni-Co coatings that were prepared by electrodeposition technique from sulphate electrolyte on the copper substrate. Effect of current density on the properties of electroplated coatings was determined via a morphology characteristics and micro-hardness of coating′surface. The tribological behaviour of Ni – Co coatings was described by friction coefficient using the pin-on-disc method.
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Kudryakov, Oleg V., Valery N. Varavka y Dmitriy S. Manturov. "Effective Wear Resistance Parameters of Ion-Plasma Tribological Coatings". Defect and Diffusion Forum 410 (17 de agosto de 2021): 444–49. http://dx.doi.org/10.4028/www.scientific.net/ddf.410.444.
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Comparative studies of wear resistance during dry friction of vacuum ion-plasma coatings of nitride systems TiAlN and CrAlSiN are carried out. The structural parameters, coating thickness, and physical and mechanical properties were chosen as comparison parameters. A fundamental difference in the wear mechanisms of the coatings is demonstrated. In the TiAlN-system coatings develop an oxidative wear mechanism due to their insufficient heat resistance. The CrAlSiN-system coatings have maximum resistance to plastic deformation. And they are wear out according to the fatigue mechanism, which is typical for coatings with a high level of mechanical properties.
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Hu, Zheng Xi, Xiao Hua Jie y Guo Hui Lu. "Tribological Properties of Pb-Sn-CNTs Composite Coatings". Advanced Materials Research 152-153 (octubre de 2010): 580–86. http://dx.doi.org/10.4028/www.scientific.net/amr.152-153.580.
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Multi-walled carbon nanotube (MWCNT)/Pb-Sn composite coatings were prepared by electrodeposition technique. Friction coefficient and wear weight losses were investigated on a double rings apparatus using carbon steel (C: 0.45%) rings as counterparts under wet friction condition. Tribological characteristics were compared among the samples as carbon nanotubes concentration was changed in the bath. The results indicate that the composite coatings had smaller friction coefficient and weight loss than that of ordinary Pb-Sn coatings under the same work conditions. In addition, the wear performance of Pb-Sn-CNTs composite coating was optimized when the CNTs concentration in bath was 2 g L-1.
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Chang, Yin-Yu y Cheng-Hsi Chung. "Tribological and Mechanical Properties of Multicomponent CrVTiNbZr(N) Coatings". Coatings 11, n.º 1 (2 de enero de 2021): 41. http://dx.doi.org/10.3390/coatings11010041.
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Multi-element material coating systems have received much attention for improving the mechanical performance in industry. However, they are still focused on ternary systems and seldom beyond quaternary ones. High entropy alloy (HEA) bulk material and thin films are systems that are each comprised of at least five principal metal elements in equally matched proportions, and some of them are found possessing much higher strength than traditional alloys. In this study, CrVTiNbZr high entropy alloy and nitrogen contained CrVTiNbZr(N) nitride coatings were synthesized using high ionization cathodic-arc deposition. A chromium-vanadium alloy target, a titanium-niobium alloy target and a pure zirconium target were used for the deposition. By controlling the nitrogen content and cathode current, the CrNbTiVZr(N) coating with gradient or multilayered composition control possessed different microstructures and mechanical properties. The effect of the nitrogen content on the chemical composition, microstructure and mechanical properties of the CrVTiNbZr(N) coatings was investigated. Compact columnar microstructure was obtained for the synthesized CrVTiNbZr(N) coatings. The CrVTiNbZrN coating (HEAN-N165), which was deposited with nitrogen flow rate of 165 standard cubic centimeters per minute (sccm), exhibited slightly blurred columnar and multilayered structures containing CrVN, TiNbN and ZrN. The design of multilayered CrVTiNbZrN coatings showed good adhesion strength. Improvement of adhesion strength was obtained with composition-gradient interlayers. The CrVTiNbZrN coating with nitrogen content higher than 50 at.% possessed the highest hardness (25.2 GPa) and the resistance to plastic deformation H3/E*2 (0.2 GPa) value, and therefore the lowest wear rate was obtained because of high abrasion wear resistance.
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Tverdokhlebov, Sergey Ivanovich, Evgeniy Viktorovich Shesterikov y Alena Igorevna Malchikhina. "Formation Hybrid Method of Multilayer Biocoatings, Based on PVD Technology". Advanced Materials Research 872 (diciembre de 2013): 241–47. http://dx.doi.org/10.4028/www.scientific.net/amr.872.241.
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Hybrid method of obtaining calcium-phosphate coatings is presented in this article. Physical and chemical, mechanical and tribological hybrid coatings research makes it possible to determine the coatings formation modes satisfying medical and technical requirements. This multilayer coating consists of an oxide underlayer formed by gas thermal oxidation and calcium phosphate layer formed by RF magnetron sputtering at a frequency of 13.56 MHz. Experiments were carried out in different modes. Calcium-phosphate coatings formed in mixture of argon and oxygen at 1:1 ratio pressure of 0.3 Pa have the best physical and chemical, mechanical and tribological properties.
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Sergeev, Viktor, Stanislav Yu Zharkov, Mark P. Kalashnikov y Alfred R. Sungatulin. "The Effect of Cu–Mo–S Coatings on Wear Resistance of Copper Friction Pair". Key Engineering Materials 685 (febrero de 2016): 587–90. http://dx.doi.org/10.4028/www.scientific.net/kem.685.587.
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The wear resistance of the coatings on the basis of Cu–Mo–S with a copper friction pair was studied by tribological tests in argon and air environment. Microstructure of the coatings was investigated by transmission and scanning electron microscopy. Fiber-globular structure of the coatings was evaluated. Cu–Mo–S coatings can increase the wear resistance of a copper friction pair in ~ 71.7 and ~ 7.9 times in argon and air atmosphere, respectively. Decrease of friction coefficient of copper friction pair from 0.59 to 0.27 (with coating) has been observed during tribological tests in air environment.
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Li, Xiaodong y Bharat Bhushan. "Micro/nanomechanical and tribological characterization of ultrathin amorphous carbon coatings". Journal of Materials Research 14, n.º 6 (junio de 1999): 2328–37. http://dx.doi.org/10.1557/jmr.1999.0309.
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Micro/nanomechanical and tribological characterization of ultrathin amorphous carbon coatings, deposited by filtered cathodic arc (FCA), direct ion beam (IB), electron cyclotron resonance plasma chemical vapor deposition (ECR-CVD), and sputter (SP) deposition processes on Si substrate have been conducted using a nanoindenter with a nanoscratch attachment and an accelerated ball-on-flat tribometer. Coating thicknesses of 20, 10, 5 nm and, for the first time, 3.5 nm coatings have been investigated. It was found the FCA coating exhibits the highest hardness and elastic modulus, followed by the ECR-CVD, IB, and SP coatings. In general, the thicker coatings exhibited better scratch/wear performance than the thinner coatings due to their better load-carrying capacity as compared to the thinner coatings. At 20 nm, the FCA and ECR-CVD coatings show the best scratch and wear resistance, while the IB and ECR-CVD coatings show the best scratch and wear resistance at 10 nm. Five nanometer thick coatings show reasonable scratch and wear resistance, while 3.5 nm thick coatings show extremely low load-carrying capacity and poor scratch and wear resistance. It appears that the 3.5 nm coatings studied are unfeasible for scratch and wear resistance applications as of now.