Journal articles: 'Abrasive mixture'

1

Zhu, Lin, Peng Hai, and De Ming Xiao. "Experimental Research on Deep Hole Honing of Difficult-to-Cut Materials Based on Mixture-Abrasive Honing Stones." Key Engineering Materials 416 (September 2009): 461–66. http://dx.doi.org/10.4028/www.scientific.net/kem.416.461.

Full text

Abstract:

The deep hole honing is an effective and precise method in deep hole processing. It can remove the machining allowance to ensure the hole size and the shape accuracy, and have better surface quality of a hole. The difficult-to-cut materials such as precipitation-hardening stainless steel, stainless steel (1Cr18Ni9Ti) and titanium alloy have the properties of high hardness, wear resistance, heat resistance, and corrosion resistance. The conventional single-abrasive honing stones can not handle the difficult-to-cut materials effectively because of their single-abrasive property. For higher efficiency, more than ten of mixture-abrasive honing stones with different proportion of different abrasives have been designed and the contrast experiments have been done for different mixture-abrasive honing stones to grind precipitation-hardening stainless steel, stainless steel (1Cr18Ni9Ti) and titanium alloy. According to several comprehensive evaluation factors of the grinding ratio, the specific grinding energy and the area that the honed chips stick the oilstones surface, the optimum proportion of different abrasives have been found for honing difficult-to-cut materials. It can be observed that the mixture-abrasive honing stones have better performance than that of single-abrasive stones when honing certain kind of difficult-to-cut materials.

APA, Harvard, Vancouver, ISO, and other styles

2

Hanada, Kotaro, and Hitomi Yamaguchi. "Development of Spherical Iron-Based Composite Powder with Carried Alumina Abrasive Grains by Plasma Spray." Advanced Materials Research 75 (June 2009): 43–46. http://dx.doi.org/10.4028/www.scientific.net/amr.75.43.

Full text

Abstract:

This paper describes the development of spherical iron-based composite powder with carried alumina abrasive grains made by a plasma spray technique. Carbonyl iron powder (7.2 μm average size) and alumina abrasive grains (0.3 μm average size) are sprayed into the plasma flame from the respective nozzles simultaneously, or their mechanical mixture is directly plasma-sprayed. In case of the composite powder obtained by the direct spray method, the alumina abrasives are well carried on the carbonyl iron particles. However, a plasma current of more than 100 A causes melting and vaporizing of the alumina abrasives;, consequently the carbonyl iron and alumina abrasives are separated. The magnetic abrasive experiments with the composite powder developed are made for SUS304 stainless steel plate, and the result shows that the developed composite powder has high potential abrasive performance.

APA, Harvard, Vancouver, ISO, and other styles

3

Pavloušková, Zina, David Jech, Pavel Komarov, Ivana Ročňáková, Lucie Dyčková, Michaela Remešová, Ladislav Čelko, and Daniel Holemý. "Characterization of High-Speed Alumina Abrasive Grinding Wheel." Defect and Diffusion Forum 405 (November 2020): 365–69. http://dx.doi.org/10.4028/www.scientific.net/ddf.405.365.

Full text

Abstract:

The high-speed grinding wheel can be defined as a self-sharpening composite structural tool composed from abrasive grains held in a specific binder. The main properties of grinding wheels depend on the type of abrasive elements, grit size, grade, binder and the resulting structure, which is influenced by several crucial technological processing steps. Preparation of an initial mixture of abrasive particles together with permanent binder’s mixture and temporary binder followed by pressing and high-temperature sintering is the essential technological step in the manufacturing of high-quality grinding wheels. High demands placed on functionality and quality together with constantly increasing effort to improve existing properties of grinding tools require detailed characterization of all input raw materials. For further research and development is crucial know, how each technological step can influence the final quality of the product. This contribution is focused on the characterization of four alumina abrasives with different grit size and two in chemical composition different binder mixtures which were used for the production of two different high-speed grinding wheels. Initial abrasive grains, binders and metallographic samples of high-speed grinding wheels were evaluated by means of scanning electron microscopy. The porosity of grinding wheels with different binding agents was also determined ustilizing digital image analysis technique.

APA, Harvard, Vancouver, ISO, and other styles

4

Zhang, Qin Lan, Zhi Yong Lu, and Xiang Liu. "Magnetic Spectral Analysis Method of Ferromagnetic Mixture." Applied Mechanics and Materials 602-605 (August 2014): 2721–25. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.2721.

Full text

Abstract:

There are different magnetic property of materials mixed in the mechanical wear of abrasive and powder processing. Depending on different alloy and magnetized material with different magnetic saturation characteristics, some substances reach the magnetic saturation in the magnetization processing soon, while some substances must be in a strong magnetic field to reach saturation, resulting in the magnetic property of combination material mixed with multi-component metal abrasive has multi-ingredient combination characteristics. Based on the PQ excitation measurement method, we analyze the magnetic property between the typical magnetic abrasive individual and combinations. We also build the magnetic spectral characteristics of the mixture which is made up of materials with different magnetic property, and finish the establishment of two mixtures mapping. This paper aims to explore the magnetic spectral analysis method of ferromagnetic mixture from the theory and experiment, and propose the magnetic spectrum analysis and calculation method of the mixture.

APA, Harvard, Vancouver, ISO, and other styles

5

Yasunaga, Nobuo. "Machining Mechanisms of Si Wafers in Mechanochemical Polishing by Soft Abrasives." Key Engineering Materials 291-292 (August 2005): 385–88. http://dx.doi.org/10.4028/www.scientific.net/kem.291-292.385.

Full text

Abstract:

The mechanism of the mechanochemical polishing of Si wafers with BaCO3, CaCO3 and ZnO abrasives was investigated by polishing experiments carried out in air, O2 and Ar gas environments on dry condition and static heat treatment experiments of mixed powder of BaCO3 and Si with various mixture ratios for analyzing the reaction mechanism at the interface in polishing operation. Results obtained were (1) Si wafers were smoothly and effectively polished with these all mechanochemical abrasive whether O2 gas existed in the surrounding environment or not, (2) Heat treatment of the mixed powder suggested that oxidation of Si was more actively promoted even when existence of BaCO3 powder was only a little in the mixture and that formation of Ba-Si oxide increased as the mixture ratio of BaCO3 powder to Si powder increased, (3) As the mechanochemical polishing mechanism, two-step reaction process would be the most reasonable, that is, chemical attack of the mechanochemical abrasive for oxidizing the Si surface as the first step and further chemical reaction to form reaction products between the formed SiO2 and the abrasive as the second step.

APA, Harvard, Vancouver, ISO, and other styles

6

Farkas, Tamás Péter, Attila Orbán, Sándor Szász, András Rapai, Erik Garamvölgyi, and Zoltán Sütő. "Examination of the Usage of a New Beak-Abrasive Material in Different Laying Hen Genotypes (Preliminary Results)." Agriculture 11, no. 10 (September 29, 2021): 947. http://dx.doi.org/10.3390/agriculture11100947.

Full text

Abstract:

The aim of the experiment was to investigate the use and effect of a new beak-abrasive material not yet examined on mortality of non-beak trimmed laying hens of different genotypes housed in an alternative pen. The study was performed on 636 females belonging to three genotypes of Bábolna TETRA Ltd. (a1 = commercial brown layer hybrid (C); a2 = purebred male line offspring group (maternal); a3 = purebfigure ed female line offspring group (paternal)). A total of 318 hens, i.e., 106 hens/genotype distributed in six pens (53 hens/pen), were evaluated. Cylindrical beak-abrasive blocks of 5.3–5.6 kg were suspended (0.1–0.4 mm diameter gravel, limestone grit, lime hydrate, and cement mixture) in six alternative pens. In six control pens without abrasive material, 318 hens, i.e., 106 hens/genotype (2 pens control group/genotype, i.e., C1 = commercial brown layer hybrid, C2 = purebred male line offspring group, C3 = purebred female line offspring group; 53 hens/pen;) were placed where there were no beak-abrasive materials. The rate of change in the weight of the beak-abrasive materials and the mortality rate were recorded daily. In the six pens equipped with beak-abrasive materials, infrared cameras were installed, and 24 h recordings were made. The number of individuals pecking the beak-abrasive material, the time and duration of dealing with the material were recorded. Data coming from one observation day are given. During the 13 experimental weeks of observation, the weight loss of beak-abrasives differed significantly in the different genotypes (a1 = 27.4%; a2 = 29.6%; a3 = 56.6%). During the only day analyzed, the hens from all the genotypes mostly stayed between 17:00 and 21:00 h in the littered scratching area where the beak-abrasive material was placed (a1 = 48.4%; a2 = 49.2%; a3 = 54.4%). In the case of each genotype, the rate of the hens dealing with beak-abrasives in the first two periods of the day was relatively low (0.2%–0.7%). Peaks of the activity were between 17:00 and 21:00 (a1 = 0.8%; a2 = 1.3%; a3 = 1.8%). The a3 dealt with the beak-abrasive materials to a significantly greater extent in the period from 13:00 to 17:00 (0.8%) and from 17:00 to 21:00 (1.8%) than the a1 (0.2% and 0.8%, respectively). Due to the use of the beak-abrasive materials, the mortality rate decreased the most in the genotypes that used them (a1 with beak-abrasive material 0.0% vs. C1 9.4%; a2 with beak-abrasive material 2.9% vs. C2 12.4%; a3 with beak-abrasive material) 15.4% vs. C3 5.7%). It can be concluded that the insertion of beak-abrasive materials increased the behavioral repertoire of hens, which is particularly beneficial from an animal welfare point of view. Further and longer-term research is needed to determine whether the insertion of the beak-abrasive material has a beneficial effect on the mortality data of the experimental groups through enrichment, either through physical abrasion of the beak or both.

APA, Harvard, Vancouver, ISO, and other styles

7

Matsuura, Hiroshi, Yasuhiro Kunieda, Nobuhito Yoshihara, Ji Wang Yan, and Tsunemoto Kuriyagawa. "Development of 3R Diamond Wheel by Thermoplastic Resin Bond." Key Engineering Materials 329 (January 2007): 459–64. http://dx.doi.org/10.4028/www.scientific.net/kem.329.459.

Full text

Abstract:

A completely new diamond wheel, named the 3R wheel, has been developed. The 3R wheel has three unprecedented functions, reconfiguration, restoration and recyclability, and is molded from a mixture of special thermoplastic resin filler and diamond powder. The concept of the 3R wheel is to control the quantity and the position of abrasive material by actively using heat. In this study, tungsten carbide (WC) was ground using a thermoplastic resin bonded diamond wheels (radius 1.4 mm) with three different concentrations of 1500 grain size abrasive. As a result, a grinding ratio of over 200 and 18 nmRa roughness was achieved without dressing. In addition, a large quantity of abrasives was confirmed on the wheel surface by observation.

APA, Harvard, Vancouver, ISO, and other styles

8

Petrica, Marcela, Sven Peissl, and Ewald Badisch. "Influence of Coal on the Wear Behavior of Steels in 3-Body Conditions." Key Engineering Materials 604 (March 2014): 75–78. http://dx.doi.org/10.4028/www.scientific.net/kem.604.75.

Full text

Abstract:

Abrasive and erosive properties of coal can lead to serious operational problems in mining industry. Here the abrasive medium is varied, containing often fractions of quartz, pyrite, and contents of coal which can be also mixed with water resulting in an abrasive slurry mixture. A better understanding of the dependence between the environmental and systematic conditions of the tribological processes that happen in ore mining and the wear behaviour of steels can be achieved only by analysing each parameter that forms these tribological processes. The Steel Wheel Abrasion Test (SWAT) represents a testing method which is capable of experimentally modelling the high stress wear environment typical for mining industry. The aim of this work exposes a comparison between the dry and slurry tribocontact in terms of wear, as well as the influence of coal simulating real field conditions.

APA, Harvard, Vancouver, ISO, and other styles

9

Fletcher, A. J., and A. Fioravanti. "Polishing and Honing Processes: An Investigation of the Thermal Properties of Mixtures of Polyborosiloxane and Silicon Carbide Abrasive." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 210, no. 3 (May 1996): 255–65. http://dx.doi.org/10.1243/pime_proc_1996_210_195_02.

Full text

Abstract:

The passage of an ultrasonic wave through a mixture of polyborosiloxane and silicon carbide abrasive, when used in a honing process, causes heating due to the attenuation of the said wave. This is critical to the honing process since the temperature in the components being treated must be limited to about 70° C. A numerical model of the heat generation and transfer processes in the polishing medium is being formulated, which requires knowledge of the thermophysical properties of the mixture. This investigation concentrates on the experimental determination of thermal conductivity, specific heat capacity and surface heat transfer coefficient for various mixtures of polyborosiloxane and silicon carbide abrasive. Theoretical, semi-empirical and empirical models are derived for the variation of these thermal properties as functions of both material composition and temperature.

APA, Harvard, Vancouver, ISO, and other styles

10

Singh, Kanwal Jeet, Inderpreet Singh Ahuja, and Jatinder Kapoor. "Optimization of Process Parameters for Surface Roughness in Ultrasonic Machining of Polycarbonate Bullet Proof Glass and Acrylic Heat Resistant Glass by Taguchi and Grey Relational Analysis Approach." Advanced Engineering Forum 23 (July 2017): 21–44. http://dx.doi.org/10.4028/www.scientific.net/aef.23.21.

Full text

Abstract:

Polycarbonate bullet proof glass and acrylic heat resistant glass are used as the functional material in many application. In this research paper, Taguchi modal is utilized for the ultrasonic machining of these material. Surface roughness is significant output parameter, because it define accuracy of the process. Taguchi modal suggest that 40% concentration, mixture of Alumina, Silicon carbide and Boron carbide abrasive in 1:1:1, 600 abrasive grit size and 1.5% HF acid gives best results in polycarbonate bullet proof glass material and for acrylic heat resistant glass, mixture of Silicon carbide and Boron Carbide abrasive in 1:1, 600 abrasive grit size and 1% HF acid gives the best results. More significant parameters contribution in surface roughness are concentration of slurry, grit size of abrasive and HF acid. Optimum parameters improved the surface roughness by 23% and 24% in polycarbonate bullet proof glass and acrylic heat resistant glass respectively.

APA, Harvard, Vancouver, ISO, and other styles

11

Kopyciński, D., S. Piasny, M. Kawalec, and A. Madizhanova. "The Abrasive Wear Resistance of Chromium Cast Iron." Archives of Foundry Engineering 14, no. 1 (March 1, 2014): 63–66. http://dx.doi.org/10.2478/afe-2014-0015.

Full text

Abstract:

Abstract The resistance of cast iron to abrasive wear depends on the metal abrasive hardness ratio. For example, hardness of the structural constituents of the cast iron metal matrix is lower than the hardness of ordinary silica sand. Also cementite, the basic component of unalloyed white cast iron, has hardness lower than the hardness of silica. Some resistance to the abrasive effect of the aforementioned silica sand can provide the chromium white cast iron containing in its structure a large amount of (Cr, Fe)7C3 carbides characterised by hardness higher than the hardness of the silica sand in question. In the present study, it has been anticipated that the white cast iron structure will be changed by changing the type of metal matrix and the type of carbides present in this matrix, which will greatly expand the application area of castings under the harsh operating conditions of abrasive wear. Moreover, the study compares the results of abrasive wear resistance tests performed on the examined types of cast iron. Tests of abrasive wear resistance were carried out on a Miller machine. Samples of standard dimensions were exposed to abrasion in a double to-and-fro movement, sliding against the bottom of a trough filled with an aqueous abrasive mixture containing SiC + distilled water. The obtained results of changes in the sample weight were approximated with a power curve and shown further in the study.

APA, Harvard, Vancouver, ISO, and other styles

12

Bansal, Ankit, Ravi Butola, M. S. Niranjan, Qasim Murtaza, and Umang Soni. "Synthesis and Characterization of Sintered Magnetic Abrasives Used in Advance Finishing Processes Through Powder Metallurgy Route." INTERNATIONAL JOURNAL OF ADVANCED PRODUCTION AND INDUSTRIAL ENGINEERING 5, no. 3 (July 5, 2020): 27–33. http://dx.doi.org/10.35121/ijapie202007345.

Full text

Abstract:

The magnetic field-assisted surface finishing process needs a sintered magnetic abrasive powder which could be a mixture of SiC and CIP particles. Tube furnaces have been used to develop SiC-based sintered magnetic abrasives. The focus of this article is to investigate the anticipated results and to carry out the fabrication setup of sintered magnetic abrasive for the super-finishing of composite materials and their coating. The article depicts a significant effect on the mechanical properties such as microhardness and compressive strength and analyzes SiC and CIP composite-based microstructure. The synthesis of the powder involves four major processes like blending; compaction and sintering. Characterization of sintered magnetic abrasives has been done using SEM, EDS, XRD to study morphology, chemical composition, crystallography, and magnetic properties. The results have been compared with the un-bonded magnetic abrasives. This paper also presents a brief literature review of the state-of-the-art technology of high-performance surface finishing processes used in manufacturing industries. Finally, the downside and stray aspects of the related literature are spotlighted and a list of prospective issues for future research directions is recommended.

APA, Harvard, Vancouver, ISO, and other styles

13

Hao, Jian Jun, Lu Ping Ma, Liang Gao, Yue Jin Ma, and Jian Guo Zhao. "TiCN Cermet Composite Coating Prepared By Reaction Nitrogen Arc Welding Cladding Process." Applied Mechanics and Materials 190-191 (July 2012): 581–84. http://dx.doi.org/10.4028/www.scientific.net/amm.190-191.581.

Full text

Abstract:

A TiCN cermet composite coating was fabricated on 45# steel substrate by reaction nitrogen arc welding cladding technique. The mixture powder of titanium and graphite was preplaced onto the 45# steel substrate after intensive mixing by star ball-mill and gluing with starch binder. The microstructures and phase of the coatings, interracial behavior between coatings and the substrate were investigated by scanning electronic microscope, X-ray diffractometer. The microhardness distribution of the coating section, frictional coefficient, abrasion loss and wearing surface morphology were investigated by microhardness tester, abrasion machine and scanning electronic microscope. The results show that an excellent bonding between the coatings and the 45# steel substrate is ensured by the strong metallurgical interface and phase of the coatings are mainly composed of TiCN. The highest microhardness of the coatings reaches HV 0.5 810, which is about 3 times more than that of the 45# steel substrate. The anti-abrasive test results show the coating has better anti-abrasive performance than the 45# steel substrate.

APA, Harvard, Vancouver, ISO, and other styles

14

Serrano, Rodrigo O. P., Ana L. P. de Castro, Edwin A. M. Rico, Maria A. Pinto, Edna M. de F. Viana, and Carlos B. Martinez. "Abrasive effects of sediments on impellers of pumps used for catching raw water." Revista Brasileira de Engenharia Agrícola e Ambiental 22, no. 9 (September 2018): 591–96. http://dx.doi.org/10.1590/1807-1929/agriambi.v22n9p519-596.

Full text

Abstract:

ABSTRACT This study presents an analysis of the abrasive effects of sediments from the bed of the Acre River, Brazil, on the wear of three different ferrous materials employed in the manufacture of impellers of centrifuge pumps used to catch raw water. In order to evaluate the abrasive wear and specific wear coefficient (k) as a function of sediment concentration, tests were conducted in samples of SAE 8620 steel, nodular cast iron and gray cast iron by using a rotary-ball abrasion meter. These tests employed abrasive slurry with concentration of 1, 2, 3, 5 and 10 g L-1 of sediments in distilled water. The volume of worn material as a function of the relative velocity of water flow in relation to the impeller blades was mathematically estimated. The experimental results showed that: i) The semi-angular and semi-rounded shapes of the sediments from the Acre River produced evidence of micro-grooving and plastic deformation in the three metallic alloys; ii) SAE 8620 steel showed higher resistance to abrasive wear than samples of gray and nodular cast iron; iii) the increase in the volume of worn material due to increment in sediment concentration and the relative velocity of the mixture (water + sediment) to the rotor pads.

APA, Harvard, Vancouver, ISO, and other styles

15

Chen, Yan, Akira Shimamoto, X. Gao, and M. M. Zhang. "Study of Friction Coefficient and Friction Force on Magnetic Abrasive Finishing." Materials Science Forum 675-677 (February 2011): 663–66. http://dx.doi.org/10.4028/www.scientific.net/msf.675-677.663.

Full text

Abstract:

In order to enhance grinding efficiency of the magnetic abrasive finishing (MAF) method, we usually use the sinter method or the cementation method to mix the magnetic particles and abrasive particles together. However, the cost is high, and the variety is incomplete. Therefore, with the ferromagnetism to iron particles, the alumina particles and the lipin three kind of material simple mixture participate in the magnetic abrasive finishing which directly polishes, already obtained the good effect through the experiment. This paper analyses and explains the characteristic of the friction coefficient and the friction force on magnetic abrasive finishing according as account and experiment data.

APA, Harvard, Vancouver, ISO, and other styles

16

Wieczorek, Andrzej N., and Mateusz Wójcicki. "Synergism of the Binary Wear Process of Machinery Elements Used for Gaining Energy Raw Materials." Energies 14, no. 7 (April 2, 2021): 1981. http://dx.doi.org/10.3390/en14071981.

Full text

Abstract:

During an in-situ operation of machines, used for the exploitation of energy raw materials, a damaging impact of the environment on the components of these machines is experienced. The action of degrading factors is mostly shown in the form of a clear synergistic effect. In particular, this effect can be seen during an exploitation of driving elements of scraper conveyors, used as one of the basic machines in the hard coal mining process. In the article, the subject–matter, connected with an operation of sprockets in scraper conveyors, is presented. Special attention is paid to a mutual reaction of the mineral abrasive and the presence of mine water. The main objective of the research work was a determination of the interactive component of the factor causing an abrasive wear–quartz abrasive connected with the associated action and the factor intensifying electrochemical corrosion–water with and without the NaCl salt content. Experimental tests were conducted in the conditions similar to the reality, with the use of a test rig in the form of a short scraper conveyor. Within the framework of the test abrasive wear rates for the case of the abrasive presence itself and a mixture of the abrasive, salt and water were determined. Based on the obtained results, it appears that there is a synergistic impact of abrasive–corrosive mixtures on the wear of the surface layer of the chain sprockets under testing, and also, the causes of the interactive component values in the function of hardness and maximum strength of the materials under investigation are presented.

APA, Harvard, Vancouver, ISO, and other styles

17

Panin, Sergey V., Lyudmila А. Kornienko, Vladislav O. Alexenko, and Larisa R. Ivanova. "Improvement of Wear Resistance of UHMWPE by Adding Solid Lubricating Fillers." Key Engineering Materials 712 (September 2016): 155–60. http://dx.doi.org/10.4028/www.scientific.net/kem.712.155.

Full text

Abstract:

For estimating effectiveness of adding solid fillers for composites with ultra-high molecular weight polyethylene matrix tribotechnical characteristics of UHMWPE mixture with graphite, molybdenum disulfide and polytetrafluoroethylene were investigated under dry friction, boundary lubrication and abrasion. The optimum filler weight fraction was determined in terms of increasing wear resistance. Permolecular structure and surface topography of wear tracks for UHMWPE composites with different weight fraction of the fillers was studied. The mechanisms of wear of polymeric composites “UHMWPE-graphite”, “UHMWPE-PTFE” and “UHMWPE-MoS2” under dry sliding friction and abrasive wear are discussed.

APA, Harvard, Vancouver, ISO, and other styles

18

Rashwan, Mohamed H., and Mohamed Nagib Abou-Zeid. "Performance of Concrete Incorporating Stone Industry Waste as Aggregates." Transportation Research Record: Journal of the Transportation Research Board 2290, no. 1 (January 2012): 122–29. http://dx.doi.org/10.3141/2290-16.

Full text

Abstract:

Scarcity of nonrenewable natural resources is stipulating the adoption of global sustainable approaches to ensure better utilization of resources. Abrasion mechanisms take place on concrete surfaces, such as pavements and hydraulic structures, as a result of mechanical wear, scour, erosion, and cavitation. Adequate attention has not been paid to the incorporation of coarse aggregate by-products from the stone industry in concrete used for building transportation infrastructures. This paper evaluates the performance of concrete mixtures that incorporate coarse aggregate by-products of the stone industry for their resistance to abrasion. Twenty-four concrete mixtures were prepared with two types of granite and one type of basalt coarse aggregates procured from the waste of stone processing factories in Egypt. Two coarse aggregate sizes were used: 9.5 and 19 mm. The three mixture sets were compared to a control set prepared with dolomite as coarse aggregate. Fresh and hardened concrete tests as well as two abrasion tests were conducted to evaluate mechanical wear and underwater abrasion resistance of the concrete. The results revealed that the stone by-products were suitable for concrete used in highly abrasive environments. Some mixtures, such as the one made with gray granite, had superior strength as well as enhanced abrasion resistance. Such by-products are underutilized by the applicators. It is recommended that this work be further pursued on a wider scale with greater focus on economical and environmental merits as well as other long-term properties.

APA, Harvard, Vancouver, ISO, and other styles

19

Yang, Sheng Fu, Chun Liang Chen, Kuang Li Chien, Chih Chao Liang, and Hsien Ho Chuo. "Reclamation of Abrasive Slurry to Obtain SiC Ceramic Material." Key Engineering Materials 905 (January 4, 2022): 333–37. http://dx.doi.org/10.4028/www.scientific.net/kem.905.333.

Full text

Abstract:

In the period of silicon and silicon carbide wafer slicing process, the abrasive oil, silicon carbide (SiC), silicon and trace elements e.g., iron, zinc, copper, and nickel is generated as an oily mixture of insoluble matter. The SiC is the main component (>70%) in the abrasive slurry and the extraction of SiC from the slurry can eliminate the risk of illegal waste disposal and reduce the cost for the enterprises. In this study, a chemical separation process is applied to remove silicon particles and SiC can be extracted from the slurry mixtures. The X-ray diffraction analysis revealed that recycled material is moissanite with two crystalline polymorphs. The 3C and 6H X-ray powder pattern is observed and the cubic and hexagonal crystalline structure is revealed. The particle size distribution analysis showed that median value of purified SiC powder material is 9.8 μm.

APA, Harvard, Vancouver, ISO, and other styles

20

Xinsheng, Wang, Yanpei Liu, Junjian Hou, Wenbin He, Kun Liu, and She Zhaobin. "Preparation and Properties of Core-Shell Structure/Ni60 Coating." Shock and Vibration 2021 (November 9, 2021): 1–9. http://dx.doi.org/10.1155/2021/2557539.

Full text

Abstract:

As the most important element in improving the service life of a mechanical system, surface coating materials are of key importance in the development of high-end equipment. To improve the comprehensive properties of the surface coating, the common core-shell structure/Ni60 coating was prepared on the surface of #45 steel by supersonic plasma spraying. The results show that the Ni60 has no layer structure, pores, cracks, and other defects on the surface of the coating. The nanohardness of the NNA(Ni60/Ni (Al) mixture powder), NNM(Ni60/Ni (MoS2) mixture powder), and NNC(Ni60/Ni (C) mixture powder) coatings is 6815 μN, 5750 μN, and 2000 μN. The results show that the wear resistance of the NNA coating is better. In the friction and wear test, the NNA coating mainly shows adhesive wear and abrasive wear, while the NNM and NNC coatings mainly show abrasive wear.

APA, Harvard, Vancouver, ISO, and other styles

21

Trembach, Bohdan, Aleksandr Grin, and Illia Trembach. "Study of the influence of the addition of an exothermic mixture and the ratio of the components of the exothermic mixture on the melting indices at FCAW." Ukrainian journal of mechanical engineering and materials science 6, no. 1 (2020): 47–53. http://dx.doi.org/10.23939/ujmems2020.01.047.

Full text

Abstract:

An important issue in the processes of strengthening and restoration of surfaces exposed to abrasive, abrasive-corrosive and hydroabrasive wear, using the process of self-protective flux-cored arc welding (FCAW), is to increase the productivity of hardfacing and the quality of the hardfacing metal. The literature review showed that one of the ways to increase the productivity of hardfacing and improve the quality of the hardfaced metal is to add an exothermic mixture to the core filler of flux-cored wire electrode. The effect of composition of filler core during FCAW on the fusion parameters, namely the addition of exothermic mixture (TM), the ratio of exothermic mixture components (CuO/Al), and the ratio of exothermic mixture oxidant to carbon content in the core composition (CuO/C) has been studied. It has been found that the optimum areas for the deposition rate (Gd), deposition factor (ad) and spattering factor (ψs) are observed for the following values of the core components: TM = 25…39, CuO/C = 5…6, CuO/Al = 3…4.

APA, Harvard, Vancouver, ISO, and other styles

22

Zhu, Li Feng, Kai Wang, Huan Wu, Dong Xiu, and Li Zhong Sun. "The Abrasive Flow Machining Simulation of Common Rail Tube Holes Based on FLUENT." Applied Mechanics and Materials 687-691 (November 2014): 4376–81. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.4376.

Full text

Abstract:

Based on the solid - liquid two-coupling theory, Use abrasive medium viscosity-temperature characteristics related to the mathematical model, using solid - liquid two-phase solution method Mixture models and standards, turbulence model combining with common rail pipe hole as the research object, choose different initial temperatures and processing procedures, numerical analysis was carried out on the flow channel wall temperature and turbulent kinetic energy. Using numerical analysis software FLUENT Abrasive Flow Machining rail tube orifice structure was three-dimensional numerical analysis; obtain a steady-state pressure, dynamic pressure, velocity, turbulent kinetic energy image, to study Abrasive Flow Machining process provides a theoretical basis and technical support.

APA, Harvard, Vancouver, ISO, and other styles

23

Orlov, I. Yu, S. A. Kryukov, and N. V. Baidakova. "Study of the mineralogical and grain size composition of the regenerated grain from bearing sludge." Industrial laboratory. Diagnostics of materials 87, no. 8 (August 21, 2021): 29–33. http://dx.doi.org/10.26896/1028-6861-2021-87-8-29-33.

Full text

Abstract:

The composition of sludges (wastes of bearing industry enterprises) is determined by the characteristics of the abrasive tool used upon manufacturing, grade of the processed material, cutting-tool lubricant (CTL) and modes of treatment. We present the results of studying the mineralogical and grain size composition of the regenerated grain from bearing sludges. The material under study is shown to have the following composition, %: abrasive particles — 5 – 8, metal particles — 50 – 90, binder — 2 – 5, balance — SOG, oil and various pollutants. The dispersion of solid particles ranges within 0.1 – 0.3 mm. The abrasive grains have a predominantly splintery shape, the individual binder particles being observed on their surface. The interlayer-cemented aggregates of two — three crystals and a large number of small splintery particles are also present. It is shown that the samples with a regenerated material containing fine abrasive grain and metal particles as a filler exhibit the highest mechanical strength and thermal conductivity. The results obtained can be used when using regenerated abrasive grain from sludge for manufacturing, e.g., grinding wheels, preparation of a molding abrasive mixture, etc.

APA, Harvard, Vancouver, ISO, and other styles

24

Li, Jun, Fangming Zhu, and Junyang Yu. "An ultrasonic-assisted soft abrasive flow processing method for mold structured surfaces." Advances in Mechanical Engineering 11, no. 1 (January 2019): 168781401881495. http://dx.doi.org/10.1177/1687814018814953.

Full text

Abstract:

As a fluid-based precise processing method, soft abrasive flow processing has been widely used in advanced electromechanical systems, complex mold manufacturing, and other engineering fields. Because of the low volume fraction of abrasive particles and micro-force/cutting removal characteristics, there exists a potential improvement in terms of processing efficiency and uniformity. In view of the above problems, this article presents an ultrasonic-assisted soft abrasive flow processing method. Based on the realizable k–ε turbulence model and the mixture flow model, an ultrasonic coupling enhancement dynamic model for soft abrasive flow is set up, and the kinetic energy transport equation of realizable k–ε turbulence model can be revised. Using particle image velocimetry technology, an on-line observation experimental platform for ultrasonic-assisted soft abrasive flow is developed to conduct the real-time acquisition of abrasive flow state and particle distribution in a constrained flow passage. An ultrasonic-assisted soft abrasive flow processing experimental platform is established to complete the processing experiment. The experimental results show that the ultrasonic excitation vibration can effectively enhance the turbulence intensity and distribution uniformity of the abrasive flow, the average processing time can be shortened by more than 6 h, and a better surface quality can be obtained.

APA, Harvard, Vancouver, ISO, and other styles

25

Lu, Zhenyu, Seung-Ho Lee, Venkata R. K. Gorantla, S. V. Babu, and Egon Matijević. "Effects of mixed abrasives in chemical mechanical polishing of oxide films." Journal of Materials Research 18, no. 10 (October 2003): 2323–30. http://dx.doi.org/10.1557/jmr.2003.0326.

Full text

Abstract:

Thermal oxide covered silicon wafers were polished with slurries containing (i) only nano-sized particles of ceria, monodispersed colloidal spherical silica, or hematite of different shapes, (ii) a binary mixture of the same nano-sized and uniform colloidal particles, and (iii) the same colloids coated with nano-sized ceria. The procedures for the preparation of the coated particles are described in this article. The polish rates and surface qualities were in all cases higher with mixed slurries, and even more so with coated particles. The performance of composite systems also depended on the shape of the particles, cubic ones being the most and spheres least efficient. Experimental results indicated that ceria in mixtures was responsible for the enhanced polish process, while core materials enhanced a closer contact of nano-sized particles with the wafer. In general, the polish rates were higher with the larger contact area between the abrasives and the wafer. This mechanism was further verified by polishing oxide wafers on 3-M fixed abrasive pads, which have cylindrical structures with flat surfaces.

APA, Harvard, Vancouver, ISO, and other styles

26

Ji, Hui, Xiurong Cao, Songlin Nie, and Fanglong Yin. "Simulation and experiment study of the self-excited oscillating mixer with abrasive jet used for the descaling of rusty steel." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 233, no. 5 (April 8, 2019): 1109–27. http://dx.doi.org/10.1177/0954408919841189.

Full text

Abstract:

A novel self-excited oscillating mixer is developed for the descaling of strip steel, which synthesizes the post-mixed abrasive water jet and self-excited oscillation. The realizable k-ɛ model is selected to investigate the effects of different abrasive entrance, inlet pressure, mixing chamber diameter, and length on the jet characteristics. Meanwhile, the effects of different inlet pressure and target distance on the outlet velocities for two kinds of mixers (including the developed mixer and conventional post-mixing mixer) with or without abrasive jet are investigated through simulation. Experiment as well as simulation results exhibited: (1) The oblique abrasive entrance can accelerate the mixture of water and abrasive due to its larger turbulent kinetic energy, and its outlet velocity is larger than that of radial and axial abrasive entrances. (2) For the developed mixer, the outlet velocity is preferable when the mixing chamber diameter is about 40–50 mm and the mixing chamber length is 20 mm. (3) The descaling efficiency of the developed mixer is superior to that of conventional post-mixing mixer. The research will lay foundation to optimize the structure of self-excited oscillating mixer for the descaling of rusty steel.

APA, Harvard, Vancouver, ISO, and other styles

27

WAKHI ANUAR, NUR FARAH BAZILAH BINTI, M.L. Mohd Khusairi, R.M. Saad, S.A. Hassan, Z. Marjom, and A.H. Abdul Rasib. "Green strength properties of waterjet abrasive waste as potential composition in green mould by Taguchi and ANOVA approach." Journal of Mechanical Engineering and Sciences 15, no. 4 (December 15, 2021): 8529–39. http://dx.doi.org/10.15282/jmes.15.4.2021.06.0672.

Full text

Abstract:

The sand casting process still continues today due to the cost-effectiveness of materials and processes. There is a wide variety of castings related to composition and size, but silica sand is widely available from coastal line mining and has a negative impact on the environment. Moreover, waste from waterjet cutting of non-ferrous and ferrous metals is practically unhazardous and may potentially be used in sand casting mould. The aim of this paper is to optimize the proportion of coal dust, water and bentonite added to the silica sand mixture and the waterjet cutting abrasive waste as a new way of handling waste with the potential to be used in sand casting manufacturing. The method used was L9 orthogonal array optimization and the composition was qualitatively measured using a green compression strength test and a green shear strength test. Factors were evaluated using the analysis of variance (ANOVA) to find the the critical factors while confirmation test was conducted for the optimal material proportion. The study concluded that the ideal ratio for silica sand mixture with waterjet abrasive waste is bentonite-12%, coal dust-5%, and water-7% for green compression strength while bentonite-12%, coal dust-6%, water-7% for green shear strength. With proper selection, the incorporation of waterjet abrasive waste into the green sand mixture is promising to potentially be used in green sand mould casting without undermine the quality of mould.

APA, Harvard, Vancouver, ISO, and other styles

28

Huang, Si, Akio Ihara, Hideo Watanabe, and Hiroyuki Hashimoto. "Effects of Solid Particle Properties on Cavitation Erosion in Solid-Water Mixtures." Journal of Fluids Engineering 118, no. 4 (December 1, 1996): 749–55. http://dx.doi.org/10.1115/1.2835505.

Full text

Abstract:

A systematic investigation has been carried out on cavitation erosion in solid-water mixtures using vibratory test facilities and some analytical devices. A mixture of distilled water and heterogeneous solid particles is used. It is shown in this work that solid particles play significant roles on acoustic cavitation erosion through two ways when present in liquids. They, aggravate the abrasive wear of materials owing to the effects of particle size, concentration, and hardness. In addition, they relieve the damage produced by the reduction of the collapse pressure of cavitation bubble because of the variation of the physical properties in mixtures. Total erosion is dependent on this governing factor.

APA, Harvard, Vancouver, ISO, and other styles

29

Novikov, Sergey, Boris Zhadanovsky, and Sergey Sinenko. "Theoretical basics and experimental methods of consideration of the concrete mixtures' movement resistance in the concrete-delivery pipelines." MATEC Web of Conferences 178 (2018): 06011. http://dx.doi.org/10.1051/matecconf/201817806011.

Full text

Abstract:

The directions associated with development and improvement in the field of works' production using the concrete and reinforced concrete are related mainly with the improvement of the quality and durability of concrete and products based on it, the rational use of material and energy resources. The research points to the necessity of determination of the exploitative performance with considering the certain factors of influence on the construction technological processes wherein the factor related with abrasiveness and aggregates size has not been fully studied. The methodology for laboratory studies of the slip velocity of a concrete mixture in the concrete-delivery pipelines is proposed: theoretical methods for estimating the resistance to movement of concrete mixtures are determined. The method for determining the specific resistance to the movement of concrete mixtures using an installation that takes into account resistance to movement of abrasive mass has been developed. Thus, the developed methods of accounting the resistance to the movement of concrete mixtures in concrete-delivery pipelines make it possible to substantially save the cost of transporting the concrete mixture with the best exploitative performance.

APA, Harvard, Vancouver, ISO, and other styles

30

Gnyusov, S. F., V. G. Durakov, and S. Yu Tarasov. "Structure and Abrasive Wear of Composite HSS M2/WC Coating." Advances in Tribology 2012 (2012): 1–9. http://dx.doi.org/10.1155/2012/502714.

Full text

Abstract:

Features of phase-structure formation and abrasive wear resistance of composite coatings “WC-M2 steel” worn against tungsten monocarbide have been investigated. It was established that adding 20 wt.% WC to the deposited powder mixture leads to the increase in M6C carbide content. These carbides show a multimodal size distribution consisting of~5.9 μm eutectic carbides along the grain boundaries,~0.25 μm carbides dispersed inside the grains. Also a greater amount of metastable austenite (~88 vol.%) is found. The high abrasive wear resistance of these coatings is provided byγ→α′-martensitic transformation and multimodal size distribution of reinforcing particles.

APA, Harvard, Vancouver, ISO, and other styles

31

Davies, P. J., and A. J. Fletcher. "The Assessment of the Rheological Characteristics of Various Polyborosiloxane/Grit Mixtures as Utilized in the Abrasive Flow Machining Process." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 209, no. 6 (November 1995): 409–18. http://dx.doi.org/10.1243/pime_proc_1995_209_171_02.

Full text

Abstract:

Abrasive flow machining (AFM) is a non-traditional machining process used since the mid-1960s, which utilizes a mixture of polyborosiloxane and abrasive grit additions extruded across surfaces and edges and through component cavities. The machining mechanism of this process is still only partially understood due to its complex nature, and the present work undertook to investigate the relationship between the rheological characteristics of several mixtures and their associated machining parameters. This paper addresses those rheological characteristics of the various mixtures used in the present work. Experiments were conducted using low viscosity (LV), medium viscosity (MV) and high viscosity (HV) polyborosiloxane base media, in conjunction with silicon carbide abrasive grit of 60 and 100 mesh size, the ratios of the grit to base polymer used being 0, 1 and 2. The test pieces used were mild steel dies and the equipment used to conduct the experiments was an Extrude Hone mark 7 A machine. The results have shown that progression from low to high viscosity base medium produces a reduction in the temperature rise (for example from 32 to 10°C over 30 cycles) as well as an increase in both the average pressure drop across the die (for example from 1700 to 2674 kPa over 30 cycles) and the processing time (for example from 28 to 406 s over 30 cycles). In addition, the temperature of the medium is seen to be an important variable in the AFM process due to its effects on viscosity. Furthermore, as the usage of a medium increases the viscosity and pressure drop across the die increase.

APA, Harvard, Vancouver, ISO, and other styles

32

Grygar, Tomáš, Jan Šubrt, and Jaroslav Boháček. "Electrochemical Dissolution of Goethite by Abrasive Stripping Voltammetry." Collection of Czechoslovak Chemical Communications 60, no. 6 (1995): 950–59. http://dx.doi.org/10.1135/cccc19950950.

Full text

Abstract:

Abrasive stripping voltammetry was applied to the investigation of the reductive dissolution of some iron(III) oxides and hydroxy-oxides, particularly goethite (α-FeOOH), in acid media. The electrode reaction directly involves the solid phase, and the reaction pathway depends on the phase composition and particle shape. This can be used for a qualitative and quantitative characterization of goethite. The results of a quantitative analysis of a mixture of goethite (α-FeOOH) and lepidocrocite (γ-FeOOH) are compared with those of IR and Moessbauer spectroscopic examination. The effects of the particle appearance (shape, crystal intergrowth) on the results of the voltammetric and chronoamperometric measurements are discussed.

APA, Harvard, Vancouver, ISO, and other styles

33

Yong, Z., and R. Kovacevic. "Effects of water-mixture film on impact contact in abrasive waterjet machining." International Journal of Mechanical Sciences 39, no. 6 (June 1997): 729–39. http://dx.doi.org/10.1016/s0020-7403(96)00071-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Dash, Rupalika, and Kalipada Maity. "Simulation of abrasive flow machining process for 2D and 3D mixture models." Frontiers of Mechanical Engineering 10, no. 4 (December 2015): 424–32. http://dx.doi.org/10.1007/s11465-015-0366-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

., Abhinav, N. Krishnamurthy, and Ranjana Jain. "Wear Studies of Al2O3-ZrO2∙5CaO Composite Coatings for Tribological Applications." International Journal of Engineering & Technology 7, no. 3.4 (June 25, 2018): 73. http://dx.doi.org/10.14419/ijet.v7i3.4.16750.

Full text

Abstract:

A composite mixture of Metco 105 SFP, 99.9% Al2O3 and Metco 201 NS, ZrO2.5CaO were blended in the pursuit of high hardness and improved wear resistance characteristics for tribological applications. In this context a composite mixture of alumina and calcia stabilized zirconia in 50:50 by wt. % proportion was developed, and applied over Al-6061 substrates. Atmospheric plasma spray coating technique was used to develop the coating systems. The ASTM G132 standard, a pin-on-disk tribometer was used to determine the specific wear rate at different normal loads of 5 N, 10 N and 15 N. Experimental results revealed that the top coat primarily subjected to sliding and localized abrasion and also confirmed with SEM micrograph. Sliding has mainly occurs in the plane of <111>, <200>, <220>, <311>, <222> found in the XRD analysis. Irrespective of the applied normal loads the coefficient of friction doesn’t influences much in the abrasive wear studies. However, wear mechanism was found to primarily dependent on the phases and on the crystallographic structure of the material used.

APA, Harvard, Vancouver, ISO, and other styles

36

Service, T. H., and J. E. Ritter. "Uniaxial and Equibiaxial Strength of a Vitreous-Bonded Abrasive." Journal of Vibration and Acoustics 111, no. 2 (April 1, 1989): 194–98. http://dx.doi.org/10.1115/1.3269841.

Full text

Abstract:

The inert strength of a vitreous-bonded abrasive material was measured using bars in four-point bending and disks in ring-on-ring flexure. It was found that the strength of the bend bars could be described by a unimodal flaw population while the strength of the disks was controlled by an exclusive bimodal mixture of flaw populations. The results show that the Weibull multiaxial statistical theory accurately predicts from bend-bar strength the ring-on-ring strength of this material, provided that the strength-controlling flaw population is properly characterized.

APA, Harvard, Vancouver, ISO, and other styles

37

Kalandyk, B., G. Tęcza, R. Zapała, and S. Sobula. "Cast High-Manganese Steel – the Effect of Microstructure on Abrasive Wear Behaviour in Miller Test." Archives of Foundry Engineering 15, no. 2 (June 1, 2015): 35–38. http://dx.doi.org/10.1515/afe-2015-0033.

Full text

Abstract:

Abstract The results of the modification of austenitic matrix in cast high-manganese steel containing 11÷19% Mn with additions of Cr, Ni and Ti were discussed. The introduction of carbide-forming alloying elements to this cast steel leads to the formation in matrix of stable complex carbide phases, which effectively increase the abrasive wear resistance in a mixture of SiC and water. The starting material used in tests was a cast Hadfield steel containing 11% Mn and 1.34% C. The results presented in the article show significant improvement in abrasive wear resistance and hardness owing to the structure modification with additions of Cr and Ti.

APA, Harvard, Vancouver, ISO, and other styles

38

Cheng, Lehua, Enzhu Hu, Xianquan Chao, Renfa Zhu, Kunhong Hu, and Xianguo Hu. "MoS2/Montmorillonite Nanocomposite: Preparation, Tribological Properties, and Inner Synergistic Lubrication." Nano 13, no. 12 (December 2018): 1850144. http://dx.doi.org/10.1142/s1793292018501448.

Full text

Abstract:

A nano-MoS2/montmorillonite K-10 (K10) composite was prepared and characterized. The composite contains two types of 2H-MoS2 nanoparticles. One is the hollow spherical MoS2 with a size range of 75[Formula: see text]nm, and the other is the spherical nano cluster of MoS2 with a size range of 30[Formula: see text]nm. The two kinds of nano-MoS2 were formed via assembly of numerous MoS2 nano-platelets with a size of [Formula: see text][Formula: see text]nm. A tribological comparison was then made among nano-MoS2/K10, K10, nano-MoS2 and a mechanical mixture of K10 and nano-MoS2. K10 reduced the wear but slightly increased the friction. Nano-MoS2 remarkably reduced both friction and wear. The mechanical mixture demonstrated better wear resistance than nano-MoS2, indicating a synergistic anti-wear effect of nano-MoS2 and K10. The synergistic effect was reinforced using nano-MoS2/K10 instead of the mechanical mixture. A part of the MoS2 in the contact region always lubricated the friction pair, and the rest formed a tribofilm. K10 segregated the friction pair to alleviate the ablation wear but magnified the abrasive wear. S-MoS2 protects K10 and they together function as both a lubricant and an isolating agent to reduce the ablation and abrasive wear.

APA, Harvard, Vancouver, ISO, and other styles

39

Pan, Q., Wen Feng Ding, Jiu Hua Xu, B. Zhang, H. H. Su, and Y. C. Fu. "Fabrication of Composite Blocks Containing Alumina Bubble Particles for Porous CBN Abrasive Wheels." Key Engineering Materials 499 (January 2012): 229–34. http://dx.doi.org/10.4028/www.scientific.net/kem.499.229.

Full text

Abstract:

Alumina (Al2O3) bubble particles were added into the mixture of CBN abrasive grains, Cu-Sn-Ti alloy and graphite particles to prepare the composite blocks for porous CBN abrasive wheels. The specimens were sintered at the temperature of 920°C for the dwell time of 30 min. The bending strength of the composite blocks was measured by the three-point bending tests. The fracture surface of the blocks was characterized. The results show that, the content of alumina bubble particles does not take significant effect on the mechanical strength of the composite blocks. Even the lowest strength of the composite blocks, 98 MPa, is higher than that of the vitrified CBN abra-sive wheels. Cu-Sn-Ti alloy has bonded firmly alumina particles and CBN grains by means of the chemical reaction and corresponding products. Finally, the chip space was formed through the re-moval of the ceramic wall of the alumina bubble particles within the CBN abrasive wheel during dressing.

APA, Harvard, Vancouver, ISO, and other styles

40

Guo, Hao, Jun Ye Li, and Teng Fei Ma. "3-D Numerical Simulation on Micro-Hole of the Common-Rail Pipe Abrasive Flow Machining." Applied Mechanics and Materials 437 (October 2013): 202–6. http://dx.doi.org/10.4028/www.scientific.net/amm.437.202.

Full text

Abstract:

Common-rail pipe is an important component of fuel injection system, whose inner cavity is hidden and requires a high precision. So that the general mechanical processing is difficult to achieve, while abrasive flow machining just be able to solve this problem. In this article, the three-dimensional model of common-rail pipe is established and meshed by GAMBIT, next the mesh file is read into FLUENT, and then the Mixture model is used for numerical simulation. By analyzing the simulation results, we can get how will the pressure difference between inlet and outlet, the volume fraction of abrasive, and the processing order impact on the processing quality. Finally, a reasonable processing program is proposed for the common-rail pipe.

APA, Harvard, Vancouver, ISO, and other styles

41

Manjunatha, B. M. Adarsh, B. S. Rakshith, B. S. Rakesh, and B. K. Venkatesha. "Study on the three body abrasive wear behaviour of EN8-steel before and after coating of wear resistance material." Journal of Mines, Metals and Fuels 69, no. 12A (April 28, 2022): 147. http://dx.doi.org/10.18311/jmmf/2021/30146.

Full text

Abstract:

The effects of aluminum, zirconium, and fly-ash mixture additions on three-body abrasive wear behaviour of EN8- steel have been systematically investigated using a threebody abrasive machine and SiO2 as abrasive.The coating material is preferred by using 49% aluminum and 49% zirconium is mixed by using 2% fly-ash, the fly ash works as a binder between aluminum and zirconium. Investigate the worn surface of EN8-steel specimen before and after coating of Al2O3, ZrSiO4 and fly-ash mixture. The Al2O3, ZrSiO4 and fly-ash coated working specimen will give less wear rate in grams compared to working specimen without coating. It clearly shows that using Al2O3 and ZrSiO4 will reduce the wear rate and increase life of EN8 steel.

APA, Harvard, Vancouver, ISO, and other styles

42

Juhani, Kristjan, Jüri Pirso, Marek Tarraste, Mart Viljus, and Taavi Suurkivi. "Three-Body Abrasive Wear of Reactive Sintered WC-Co Hardmetals with Grain Growth Inhibitors." Key Engineering Materials 604 (March 2014): 277–82. http://dx.doi.org/10.4028/www.scientific.net/kem.604.277.

Full text

Abstract:

WC-Co hardmetals are widely known wear resistant materials, their properties depend strongly on the WC grain size; commonly fine grained materials exhibited higher properties. One opportunity to produce fine grained materials is reactive sintering. Reactive sintering is a novel processing method, where the synthesis of the carbide phase is combined with solid and liquid state sintering of the composite during a single heating cycle. WC-co hardmetals where synthesizedin situfrom the elemental powders of W, Co and C. To investigate the influence of grain growth inhibitors the Cr3C2and VC were also included to powder mixtures. To investigate the influence of carbon content composites with different amounts of C were produced. The microstructures, hardness and three-body abrasive wear resistance of reactive sintered WC-Co hardmetals with grain growth inhibitors depending on carbon content in initial powder mixture is exhibited.

APA, Harvard, Vancouver, ISO, and other styles

43

Tęcza, Grzegorz. "Changes in Microstructure and Abrasion Resistance during Miller Test of Hadfield High-Manganese Cast Steel after the Formation of Vanadium Carbides in Alloy Matrix." Materials 15, no. 3 (January 28, 2022): 1021. http://dx.doi.org/10.3390/ma15031021.

Full text

Abstract:

Hadfield cast steel is characterized by high wear resistance, but this is only when it is subjected to the effect of dynamic loads. During unloaded abrasion, e.g., sand abrasion, its wear resistance is very low and comparable to the wear of carbon cast steel. To increase the wear resistance of this alloy for operation under the conditions of low pressure or low stress, primary vanadium carbides were produced by the metallurgical process to obtain a two-phase structure after alloy solidification. Compared to samples made of Hadfield cast steel, the primary, very hard carbides, evenly distributed in an austenitic or austenitic-martensitic matrix, increase (at least three times) the wear resistance of samples tested in an abrasive mixture of silicon carbide and water. The changes in microstructure and hardness obtained in alloys after heat treatment (quenching at 1000–1150 °C in water and tempering at 600 °C) are presented. The bulk hardness of the matrix ranged from 370 HV to 660 HV. After heat treatment, the secondary, dispersed vanadium carbides, precipitated in the alloy matrix.

APA, Harvard, Vancouver, ISO, and other styles

44

Furutani, Katsushi. "Proposal for Abrasive Layer Fabrication on Thin Wire by Electrical Discharge Machining." International Journal of Automation Technology 4, no. 4 (July 5, 2010): 394–98. http://dx.doi.org/10.20965/ijat.2010.p0394.

Full text

Abstract:

This paper deals with a method of fabricating an abrasive layer on a thin wire by means of electrical discharge machining (EDM). An electrodeposited wire saw is useful for slicing a silicon ingot. However, strong acids are used in the production process and the depositing speed is slow. To overcome these problems, a fabrication process for an abrasive layer on a thin wire by EDM is proposed. The layer deposited by EDM with a green compact electrode is porous under certain electrical conditions so that the layer is composed of abrasive grit, pores and bond. A mixture of WC, Co, and the abrasive was compressed to make the green compact electrode. Two green compact electrodes were placed facing each other and were reciprocally fed during the process. The WC layer was deposited in 1s on an area in a preliminary experiment. The feed rate of 0.12-mm piano wire was set to 50mm/min. Al2O3abrasive powders with a size of 35-50µm were able to be contained in the WC layer on the wire. The deposit containing the abrasive firmly adhered. Because the deposited WC layer was very hard, tight gripping of the grit can be also expected. A copper block was cut with a raw piano wire, with wires with or without the abrasive deposited by EDM, and with electrodeposited or resinoid wire saws available on the market to compare their cutting performance. The initial tension was set to 5N and the cutting load was changed from 5.5 to 9.0N. The average feed speed of the wire was set to 8m/min. After 2000 reciprocating motions, the amounts machined with the deposited wire were larger than those with the wire saw available on the market. The deposited wire endured the same cutting load as the electrodeposited wire saw.

APA, Harvard, Vancouver, ISO, and other styles

45

Kim, Jeong Su, Lida Heng, Sieb Chanchamnan, and Sang Don Mun. "Machining the Surface of Orthopedic Stent Wire Using a Non-Toxic Abrasive Compound in a Magnetic Abrasive Finishing Process." Applied Sciences 11, no. 16 (August 6, 2021): 7267. http://dx.doi.org/10.3390/app11167267.

Full text

Abstract:

The orthopedic stent wire is one of the critical medical components, which is mainly used for the replacement of physically damaged parts in the human body. Therefore, a smooth surface and lack of toxic substances on the surface of this component are highly demanded. In this study, a magnetic abrasive finishing (MAF) process was carried out using a non-toxic abrasive compound (a mixture of iron powder, diamond particles, cold cream, and eco-friendly oils) to achieve high-quality surface finishing of orthopedic stent wire. The surface roughness (Ra) of the stent wire was investigated according to various processing parameters: different rotational speeds (500, 1000, and 2000 rpm), diamond particle sizes (1.0 µm), and three eco-friendly oils (olive oil: C98H184O10; grapeseed oil: C18H32O2; and castor oil: C57H104O9) within 300 s of the finishing time. The results showed that the surface roughness of the wire was reduced to 0.04 µm with a rotation speed of 1000 rpm and a diamond particle size of 1 µm when using grapeseed oil. SEM microimages and EDS analysis showed that the MAF process using a non-toxic abrasive compound could improve the surface quality of orthopedic Ni-Ti stent wire with a lack of toxic substances on the surface finish.

APA, Harvard, Vancouver, ISO, and other styles

46

Pozo-Antonio, Jose, Laura López, Amelia Dionísio, and Teresa Rivas. "A Study on the Suitability of Mechanical Soft-Abrasive Blasting Methods to Extract Graffiti Paints on Ornamental Stones." Coatings 8, no. 10 (September 24, 2018): 335. http://dx.doi.org/10.3390/coatings8100335.

Full text

Abstract:

Mechanical methods to extract undesired graffiti paints on ornamental stones are efficient cleaning methods from an economical point of view. However, effort on the optimization of mechanical cleaning procedures to avoid any damage to the substrate is required for large areas. In this study, two ornamental stones with different composition and texture, and which are commonly used in Spain and Portugal were selected: Granite Vilachán and Limestone Lioz. Moreover, the most common surface finishes were selected-disc-cutting and bush-hammering to simulate the stones found in buildings. Two graffiti spray paints were selected: Blue Ultramarine and Silver Chrome. As cleaning methods, three soft-abrasive blasting procedures: Hydrogommage (mixture of air–water–micro grained silicon abrasive), IBIX (mixture of air–micro grained silicon abrasive), and dry-ice procedure (carbon dioxide ice pellets), were tested at pressure below 0.4 MPa. The methodology for evaluating the effectiveness and harmfulness of each cleaning method was based on stereomicroscopy, scanning electron microscopy, color spectrophotometry, and confocal microscopy. As result, IBIX achieved the highest level of graffiti paint extraction although this method increased the surface roughness. Conversely, cleaning based on dry-ice projection did not achieve a satisfactory extraction of the graffiti, mainly of the blue paint. Dry-ice blasting can induce acid environments and IBIX causes dust emission during the projection. Hydrogommage was the most efficient cleaning method amongst the tested procedures, because it induced the lowest roughness change and although the graffiti extraction was not complete, it achieved the highest removal level. Therefore, the most satisfactory cleaning method was that achieving a satisfactory extraction level, minimal modifications of the surface roughness, an economic suitability, an environmental integration, and lower human health risks.

APA, Harvard, Vancouver, ISO, and other styles

47

Ranjan, A., S. Chakraborty, D. Kumar, and D. Bose. "An Investigation on Surfactant Added PMWEDM of Inconel 718." International Journal of Automotive and Mechanical Engineering 17, no. 3 (October 6, 2020): 8140–49. http://dx.doi.org/10.15282/ijame.17.3.2020.07.0611.

Full text

Abstract:

This paper shows the impact of different process parameters and powder characteristics on the material removal rate and surface roughness obtained in surfactant added Powder Mixed Wire Electric Discharge Machining (PMWEDM). Inconel-718 is selected as the workpiece material, which has ample application in the industries handling environment of extreme stress, pressure and temperature. It has high work hardening properties along with high rupture strength, fatigue, and creep, making it extremely difficult to machine. So, additives having different thermo-physical properties are studied to improve the machining efficiency. The additives experimented includes aluminium, silicon carbide, graphite, and aluminium oxide. It is found that the electrostatic force present creates an agglomeration effect with dielectric additive powders, causing inhomogeneity in the mixture. So, a surfactant SPAN20 is used here to maintain the homogeneity of the mixture. The obtained MRR and SR are then modelled and optimised through Particle Swarm Optimization technique (PSO). It is observed that the addition of SPAN20 has improved the MRR by 13.56% and, SR by 45.05%. Also, it has been found that due to the combined abrasive action, abrasive powders increase MRR significantly than others. Furthermore, it is found that low grit size powders with lower density produces better machined surfaces.

APA, Harvard, Vancouver, ISO, and other styles

48

Abd El Aal, Mohamed Ibrahim, Hossam Hemdan El-Fahhar, Abdelkarim Yousif Mohamed, and Elshafey Ahmed Gadallah. "Influence of Parallel Tubular Channel Angular Pressing (PTCAP) Processing on the Microstructure Evolution and Wear Characteristics of Copper and Brass Tubes." Materials 15, no. 9 (April 20, 2022): 2985. http://dx.doi.org/10.3390/ma15092985.

Full text

Abstract:

The influence of the number of passes and the tube materials on the microstructural evolution, mechanical properties, and wear behavior of Cu and brass tubes after parallel tubular channel angular pressing (PTCAP) was investigated. The grain size decreased to final grain sizes of 138.6 nm and 142.7 nm, after PTCAP of the Cu and brass tubes was conducted in up to 4 and 2 passes, respectively. PTCAP contributes to obtaining an ultra-fine grain (UFG) microstructure, with a mixture of different grain sizes that conferred high hardness. The present results indicate the superior wear resistance of Cu and brass PTCAP tubes, relative to Cu and brass samples that were previously deformed by different severe plastic deformation (SPD) processes. The wear mechanism of the Cu tubes changed from delamination and cracks with a high degree of adhesive wear before PTCAP into a combination of adhesive and abrasive wear, with a decrease in the presence of oxygen content after the PTCAP procedure. The wear mechanism also changed from a combination of adhesive and abrasive mechanisms into abrasive ones with the absence of oxygen after the PTCAP of brass tubes.

APA, Harvard, Vancouver, ISO, and other styles

49

Singh, Kanwal Jeet, Inderpreet Singh Ahuja, and Jatinder Kapoor. "Experimental Investigation and Study the Effect of Hydro Fluoric Acid in Ultrasonic Machining of Polycarbonate Bullet Proof UL-752 and Acrylic Heat Resistant BS-476 Glass." Advanced Engineering Forum 24 (October 2017): 24–39. http://dx.doi.org/10.4028/www.scientific.net/aef.24.24.

Full text

Abstract:

The main objective of this experimental work is to study the effect of Hydro Fluoric acid in ultrasonic machining of polycarbonate bullet proof UL-752 and Acrylic Heat resistant BS 476 Glass. In which, mixture of abrasive particle are also used as the input machining parameter. Three types of abrasive; Alumina, Silicon Carbide and Boron Carbide are used for machining. Experiment has been performed with 8mm of high carbon high chromium tool steel (D2), high carbon steel (HCS) and high speed tool steel (HSS) tools. The material removal rate was father enhanced by HF acid. The experimentation date represent the main effect plots for tool wear rate and material removal rate. After analysis, results reveals that Al2O3+SiC+B2C mixed slurry (1:1:1), Hydro Fluoric acid with 1% concentration and High Speed tool Steel material produce the higher material removal affect.

APA, Harvard, Vancouver, ISO, and other styles

50

Ion, Constantin Sorin, Mihaela Bombos, Gabriel Vasilievici, Casen Panaitescu, and Raluca Dragomir. "Fuels Desulphurization by Adsorption on Blasting Grit." Revista de Chimie 68, no. 4 (May 15, 2017): 732–36. http://dx.doi.org/10.37358/rc.17.4.5540.

Full text

Abstract:

Desulphurization by reactive adsorption was studied on sand abrasive blasting grit/ bentonite. The adsorbent was characterized by determining the composition, adsorption isotherms, specific surface area, pore volume and average pore diameter. Adsorption experiments were performed in continuous system at 260�300oC, 25 atm and volume hourly space velocities of 1-2 h-1. The efficiency of adsorption was evaluated at desulphurization of a synthetic reaction mixture and a catalytic cracking gas oil.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Abrasive mixture'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles