Статті в журналах: "Abrasion Resistance Machine"

1

TARASIUK, Wojciech, Jerzy NAPIÓRKOWSKI, Krzysztof LIGIER, and Bazyli KRUPICZ. "COMPARISON OF THE WEAR RESISTANCE OF HARDOX 500 STEEL AND 20MnCr5." Tribologia 273, no. 3 (June 30, 2017): 165–70. http://dx.doi.org/10.5604/01.3001.0010.6254.

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The paper presents the results of experimental studies on abrasion resistance of Hardox 500 steel and 20MnCr5 steel subjected to thermo-chemical treatment. These types of steel are often used for agricultural or construction machinery. Abrasion tests were performed on a T-11 pin using a disc tester. The test conditions correspond to the wear caused by micro-grinding and grain-cutting using particles from the product as well as a result of abrasion produced by loose abrasive material created through the chipping of silica sand grains. The obtained results can be useful in the selection of materials for machine components.

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2

Li, Hao Ping, Feng Li, Zhi Fan Fang, and Yong Qing Chen. "Study on Turbine Blade Abrasion Mechanism and Abrasion Resistance Performance Testing Machine." Advanced Materials Research 621 (December 2012): 206–10. http://dx.doi.org/10.4028/www.scientific.net/amr.621.206.

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This paper studied the flow indicators affecting abrasion through turbine component surface, analyzed the indicator data of major rivers, which provided design parameters and design basis of the abrasion test equipment; and studied abrasion test methods of turbine overflow surface, determined the rotating-jet mode abrasion test principle and design parameters of the rotating-jet abrasion testing machine

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3

Müller, M., and P. Hrabě. "Overlay materials used for increasing lifetime of machine parts working under conditions of intensive abrasion." Research in Agricultural Engineering 59, No. 1 (March 6, 2013): 16–22. http://dx.doi.org/10.17221/64/2011-rae.

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We evaluated a degree of the machine part abrasive wear with secondary focus on their hardness. The paper states laboratory results of overlay systems from their wear resistance point of view. Laboratory experiments were carried out by two-body abrasion on bonded abrasive of a P120 granularity. The results proved an increased abrasive wear resistance of martensitic, ledeburitic and stellitic overlays against eleven different original products. The overlay UTP Ledurit 60 reached the optimum values. The GD-OES (Glow Discharge Optical Emission Spectroscopy) method proved the different chemical composition of the overlay from the stated chemical composition of the overlaying electrode.    

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4

Ueda, Keiji, Nobuyuki Ishikawa, and Yasuhiro Murota. "Influence of Matrix Structure and Hard Carbide on Abrasive Resistance of Steel Plates." Materials Science Forum 706-709 (January 2012): 2342–47. http://dx.doi.org/10.4028/www.scientific.net/msf.706-709.2342.

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The microstructure of abrasion resistant steel plate usually consists of as quenched martensite, because harder matrix structure improves abrasion resistance of a steel plate. However hard martensitic material has lower formability, which is the important material property for fabricating machine parts. In this paper, a new type of abrasion resistant technique for steel plate is introduced. The steel provides good combination of high abrasion resistance and excellent formability without increasing hardness. The key technology to balance abrasion resistance and formability is the microstructural control of the ferritic matrix structure with dispersed extremely hard carbide particles. Basic research of abrasion mechanism revealed that abrasion resistance is strongly affected by the kind of carbides and the dispersed condition.

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5

Tian, Hao Liang, Shi Cheng Wei, Yong Xiong Chen, Hui Tong, Zhi Bin Zhang, and Bin Shi Xu. "Study on Composition and Mechanical Property of New High Abrasion Resistant Alloy Used in High Arc Spaying." Advanced Materials Research 531 (June 2012): 189–93. http://dx.doi.org/10.4028/www.scientific.net/amr.531.189.

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Spraying wire was widely used in remanufacturing work piece for worn failure. With the demand of high abrasion resistant wire, new type alloy was developed. The solidification structures of the new high abrasion resistant alloy (HARA) containing Mn, Cr, Si, C and the structure was studied after tension by scanning electron microscopy (SEM). The phase evolution was analyzed by X-ray diffraction and Rockwell hardness evaluated on the hardness testing. The abrasion behavior of HARA alloy used in the liner of wet-grinding machine in metallurgical industry is investigated under impacted energy of 0.5-3 J in acid-ironstone slurry; the test was carried out by a modified MLD-10 tester. The result show that the solidification structures of HARA alloy consist of austenitic Fe and the hardness neared to HRC60. Under the high energy, the wear resistance of HARA alloy is three times more than Mn13. Therefore, the new material has better abrasive wear resistance and lower environmental impact

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6

Czaplicki, Zdzisław, Adam Rylski, Wioleta Serweta, and Stanisław Strzelecki. "Research on Footwear Laces with Respect to Abrasion Resistance and Spontaneous Untying." Fibres and Textiles in Eastern Europe 28, no. 3(141) (June 30, 2020): 23–26. http://dx.doi.org/10.5604/01.3001.0013.9014.

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In this paper, two types of footwear laces research were undertaken. The first was connected with abrasion resistance and the second with the displacement force at the knot. The abrasion resistance was registered by the level of abrasion for standard eyelet. The displacement force was measured with the use of a tensile test machine, where the force and extension were registered. As a criterion of test evaluation, the maximum force was established when the knot was untied. The research was conducted for a set of different types of shoelaces (differing in shape, structure and raw materials). The evaluation criteria proposed can be used in order to determine the raw materials and optimal construction of shoelaces. From the user’s point of view, the measures identified i. e. the displacement force in the knot (Fpw) and abrasion resistance (Ks) are the most important factors.

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7

Matseevich, Andrey, Tatyana Matseevich, and Andrey Askadskii. "Study of the abrasion resistance of wood-polymer composites and mixtures of ABS-plastic with polyvinyl chloride." MATEC Web of Conferences 196 (2018): 04069. http://dx.doi.org/10.1051/matecconf/201819604069.

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The abrasion of materials based on blends of ABS plastic with polyvinyl chloride (PVC) as well as terraced boards based on wood-polymer composites (DPC) has been studied. The measurements were carried out on a drum-type machine, and on a Taber's abrasimeter. For blends of ABS plastic with PVC at abrasion path length 600 m wear is 0.85%. For terracotta boards based on WPC, the wear during the test (loss of mass) was 0.0042 g. The abrasion of the sample was 9.29×10-5 g/cm2. Thus, the obtained blends should be recommended for application for floor coverings, since they possess negligible abrasion.

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8

Xie, Jing Pei, Ai Qin Wang, Wen Yan Wang, Ji Wen Li, and Luo Li Li. "Erosion Wear Behaviors of Low Chromium Cast Iron Containing Nickel." Advanced Materials Research 233-235 (May 2011): 2984–87. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.2984.

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The erosion wear experiments of low-chromium cast iron containing nickel were done by MCF-30 Erosion Abrasion Experimental Machine. The structure and surface morphology after erosive wear were analyzed by SEM and XRD. The results indicated that the distribution of carbide was reticular after tempering at 250and oil quenching at 960. The maximal erosion wear rate was appeared at 60 °erosion angle, high acid corrosion media have great influence on the abrasion resistance of experimental material and corrosion effects almost had no influence on the abrasion resistance of experimental material in the weak acid environment of pH≥3. The erosive wear mechanism of the experimental material was studied.

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9

Krauledaitė, Julija, Kristina Ancutienė, Virginijus Urbelis, Sigitas Krauledas, and Virginija Sacevičienė. "Development and evaluation of 3D knitted fabrics to protect against mechanical risk." Journal of Industrial Textiles 49, no. 3 (June 17, 2018): 383–401. http://dx.doi.org/10.1177/1528083718783316.

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In this research, eight different 3D weft-knitted fabrics were developed and evaluated. 3D fabrics have been knitted on circular weft-knitting machines with two different gauges: 20E gauge and 28E gauge. Three different raw materials were used for the fabric’s production: high molecular mass polyethylene (HPPE) yarn and 0.05 mm diameter steel wire in the outer layers (for the front and reverse) and polyamide yarn in the binding layer. The experiments were conducted on the developed 3D knitted fabrics to determine the fabric’s resistance to mechanical risks such as circular blade cut, puncture, abrasion, and also to evaluate the comfort parameter, such as air permeability. It was defined that 3D weft-knitted fabrics best results on tests: circular blade cut, puncture and abrasion resistant were achieved using HPPE yarn twisted with steel wire, higher mass per unit area with more significant amount of steel wire. According to the standard EN 388:2003, three samples of developed 3D weft-knitted fabrics had the highest 5th blade cut and the highest (4th) abrasion resistance level. All of them had the highest (4th) level of puncture resistance. 3D fabrics knitted on a circular weft-knitting machine of gauge 28E ensured 1.3–2.1 times greater blade cut and 4.9–12.1 times greater abrasion resistance result, than fabrics knitted on gauge 20E, due to a higher stitch density, higher mass per unit area, density and fabric’s thickness. But on the other hand, these parameters lowered air permeability by 20.2–43.0%.

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10

Cheng, Zhi Fang, Hong Sheng Ding, Hui Rong, and Li Geng Zhao. "Abrasion Resistance of Alumina-Titanium Dioxid Coating at High Temperature." Applied Mechanics and Materials 302 (February 2013): 115–18. http://dx.doi.org/10.4028/www.scientific.net/amm.302.115.

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Nano-structured and micron Al2O3-13%TiO2 coatings were deposited by air plasma spraying.Wear properties of the coatings under different temperature trough SRV friction and wear testing machine were studied, the results shows that the friction coefficient of nano and micron Al2O3-13%TiO2 coatings both have rising trend.with the temperature increases.The wear volume of micron coating is 1.8-2 times that of the nano coating..The nanometer Al2O3-13%TiO2 coating slide with ZrO2 is still compact and has no large crack after abrasion.

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11

Abu Obaid, A., and JW Gillespie. "Effects of abrasion on mechanical properties of Kevlar KM2-600 and S glass tows." Textile Research Journal 89, no. 6 (February 28, 2018): 989–1002. http://dx.doi.org/10.1177/0040517518760753.

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In this effort, the effects of abrasion on the mechanical properties of Kevlar KM2-600 and two types of S glass tows (AGY S2 and Owens Corning Shield Strand S) are studied. Data was generated from cyclic abrasion tests conducted at a tension level of 8% of failure load at10 mm/s (24 in/min) using a specially developed abrasion test machine. Fit curves for axial modulus and tenacity loss were established as a function of abrasion time/contact length for each tow type. Fiber surface damage and fiber breakage within the tows were identified as the major source of tow property degradation. Based on scanning electron microscopy measurements, glass fibers exhibited surface damage (micro-cracks and sizing/coating removal) that were more extensive in AGY S2 glass fibers. Kevlar KM2 fibers after tow abrasion tests exhibited fibrillation and peeling of broken fibrils from the fiber surface. In all three fibers, surface damage increased at longer abrasion times/friction contact length. Overall, the results indicated that the abrasion resistance is the highest for Kevlar KM2, followed by OCV Shield Strand and AGY S2 glass tows. The sizing material on OCV Shield Strand fibers contributed to the improved abrasion resistance compared to AGY S2.

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12

Chen, Hui Min, L. J. Xu, and H. G. Wang. "Research on Frictional Wear Property of the High Vanadium High Speed Steel in Conditions of Low Slip-Roll Ratio." Key Engineering Materials 455 (December 2010): 431–34. http://dx.doi.org/10.4028/www.scientific.net/kem.455.431.

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The frictional resistance and abrasion mechanism of high vanadium high speed steel were studied by the self-made friction wear testing machine under the conditions of 0.5% slip-roll ratio. Results show that the frictional resistance increases with the increase of carbon content. The retained austenite and the shapes of carbides will change when the carbon content alters, which make the frictional resistance of the material change, and the proper quantities of retained austenite makes the impact toughness the matrix better; The spherical VC can prevent the initiation and expansion of cracks forming and make the frictional resistance increase. The abrasion mechanism is fatigue flake under the condition of rolling and sliding.

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13

Chen, Hui Min, and Liu Jie Xu. "Study on Frictional Wear Property of the High Vanadium High Speed Steel." Key Engineering Materials 458 (December 2010): 252–57. http://dx.doi.org/10.4028/www.scientific.net/kem.458.252.

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The frictional resistance and abrasion mechanism of high vanadium high speed steel were studied by the self-made friction wear testing machine under the conditions of 10% slip-roll ratio. Results show that the frictional resistance increases with the increase of carbon content and is optimal when the carbon content is 2.92%. The carbon content affect the wear resistance by changing the amount of the retained austenite and the shapes of carbides, the moderate quantities of retained austenite makes the matrix have better impact toughness and hardness; The spherical VC can prevent the initiation and expansion of cracks forming and make the frictional resistance increase. The abrasion mechanism is fatigue flake under the condition of rolling and sliding.

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14

Pan, Yong Tai, and Yong Zhi Li. "Experimental Study on Improving Abrasion Resistance of Sizing Crusher Tooth." Advanced Materials Research 150-151 (October 2010): 1311–14. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.1311.

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The shorter service life of sizing crusher tooth is a difficult technology problem. At present the coal classification used in crushing machine, due to poor working conditions, despite the use of wear resistant surfacing electrode to improve the wear resistance of broken teeth, broken teeth, but not to the average life of six months, the subject of study was significantly improve the life of the crusher tooth. To improve the service life of sizing crusher tooth, some research has been done, through system analysis and test some result can be concluded.

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15

Liu, Ke Ming, Lian Yong Zhang, Zhuang Ma, and Bo Liu. "Research on the Properties of Grind-Hardening and Abrasion of 42CrMo Steel in Agricultural Diesel Engine Crankshaft." Advanced Materials Research 619 (December 2012): 567–71. http://dx.doi.org/10.4028/www.scientific.net/amr.619.567.

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In order to improve the strength and wear-resistance of agricultural diesel engine crankshaft, the grinding-hardening experiment of crankshaft material 42CrMo steel was carried out on MM7132 surface grinder. Microstructure of the specimens was observed with SSX-550 scanning electron microscope (SEM) and the abrasion experiment was carried out on ML -100 abrasive wear testing machine. The results showed that the maximum mircrohardness of 42CrMo steel after grind hardening was 850HV and the maximum depth of grind hardening layer was 1.25mm. The hardened layer was fully occupied by lath martensite; a little of martensite and much tempered sorbite appeared in the transitional region. The wear-resistance of the specimens after grind hardening was improved by three times.

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16

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.

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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.

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17

Březina, Roman, Josef Filípek, and Jaroslav Šenberger. "The abrasion of austempered cast iron in laboratory and work conditions." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 53, no. 4 (2005): 15–22. http://dx.doi.org/10.11118/actaun200553040015.

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Austempered ductile iron (ADI) is nowadays used for machine parts, which used to be made of steel. It is suitable for abrasive conditions and cast irons exhibit sufficient strength and toughness. The paper deals with the possibility of manufacturing machine parts working in soil of austempered ductile iron. The authors find out the influence of heat treatment mode of ADI on wear resistance and compare it with formed steel.

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18

TARASIUK, Wojciech, Mariusz LISZEWSKI, Bazyli KRUPICZ, and Ewa KASPRZYCKA. "THE ANALYSIS OF THE SELECTED PROCESSES OF THERMO-CHEMICAL HEAT TREATMENT OF 20MnCr5 STEEL IN THE CONTEXT OF ABRASIVE WEAR." Tribologia 269, no. 5 (October 31, 2016): 183–93. http://dx.doi.org/10.5604/01.3001.0010.6699.

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This paper presents the results of tribological tests performed on a T-11 pin-on-disc type, which made it possible to determine the intensity of abrasive wear of steel 20MnCr5 subjected to selected thermo-chemical heat treatments. The tested steel, after the hardening and tempering process, is characterized by high endurance parameters and is used on heavily loaded machine parts. It is frequently used for elements subjected to intense abrasion. The analysis involved the following: carburizing, boronizing, and various methods of diffusion chromizing. For large loads, it is advisable to apply boronizing or carburizing with hardening. Chrome plating entails a very thin layer of increased hardness, which is characterised by a low abrasive wear resistance at high loads.

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19

KUDOU, Rumi, and Hidenori ONO. "DEVELOPMENT OF ABRASION ACCELERATING MACHINE OF THE FLOOR FOR REPRODUCING CHANGE OF THE SLIP RESISTANCE FROM ABRASION IN WALKING." Journal of Structural and Construction Engineering (Transactions of AIJ) 73, no. 631 (2008): 1483–87. http://dx.doi.org/10.3130/aijs.73.1483.

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20

Saygılı, Yaşar Serhat, and Bülent Çakmak. "Toprak İşleme Makinalarının Aktif Elemanlarında Yüzey Kaplama Uygulamaları." Turkish Journal of Agriculture - Food Science and Technology 8, sp1 (December 12, 2020): 92–99. http://dx.doi.org/10.24925/turjaf.v8isp1.92-99.3994.

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Tillage machines such as plow, cultivator, rotavator, and rototiller are widely used for this purpose. However, one of the major problems in working with tillage machines is the wear of active parts over time. Abrasion occurs differently in active parts of tillage machines and can cause the machines used to lose the functionality expected of them. It is preferred to cover the active parts with wear-resistant coating materials to reduce the level of wear to meet both agro technical demands and high tillage efficiency. The way of wear the active parts of the machines; it is abrasive wear caused by friction against solid materials in the soil (clods, stones, harder materials, etc.) and/or adhesive wear caused by soil moisture. Reducing the wear on the active parts with the coating process to be made will both prevent material loss caused by abrasion in the active part and increase the efficiency/effectiveness of the machine. Because of the limited number of studies on this subject in the agricultural sector shows that the subject is open to improvement. In this study, the use of new coating methods used in other production sectors (especially in mold manufacturing) for the last decade in coating the active parts of soil tillage machines and their effects on product performance and life by increasing wear resistance are compiled. Coating methods that can be adapted to the agricultural sector can be listed as; Gas Phase, Liquid Phase and Melted/Semi-Melted Phase. Among these, studies on Plasma Thermal Spraying (Molten / Semi-Molten Phase Coating Methods) and thin film coating (Vapor Phase Coating Methods) are prominent. On the other hand, it is predicted that the desired wear resistance can be further improved by applying different coating methods and combinations.

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21

Feng, Yi Fan, Ren Bo Song, Zhong Zheng Pei, and Lun Li. "Microstructural Evolution and Wear Behavior Involving the K-Carbides Precipitation of a Fe-25Mn-6.6Al-1.3C Austenitic Steel." Materials Science Forum 941 (December 2018): 668–73. http://dx.doi.org/10.4028/www.scientific.net/msf.941.668.

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In this paper, the microstructural evolution and mechanical properties of the as-cast Fe-25Mn-7Al-1.3C austenitic steel after different heat treatment were investigated. After solution treatment and subsequent aging treatment, the κ-carbides with perovskite structure were found to precipitate coherently within the austenite matrix, which improved the initial hardness and mechanical strength. The experimental steel exhibited an optimal comprehensive performance after being solution treated at 1050 °C for 1 h and then aged at 550 oC for 2 h. The tensile strength was 751 MPa, the yield strength was 581 MPa, the elongation was 48%, the hardness was 252 HB, and the Charpy V-notch impact toughness was 168 J, respectively. The impact wear test was carried out on MLD-10 abrasive wear testing machine, and the worn out surfaces under different heat treatment were characterized by scanning electron microscopy (SEM). The results indicated that the abrasion resistance of the steel under the additional aging treatment was better than that of the as-solutionized steel. The optimal abrasion resistance was obtained after being soluted at 1050 °C for 1 h and then aged at 550 oC for 2 h. However, with the aging time increasing, the coarse κ-carbides precipitating around the grain boundaries would deteriorate toughness, which lead to increase of the abrasive wear volume loss. Besides, obvious micro-cracking and relatively larger peeling pit were observed.

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22

Zhu, Licheng, Maryam Naebe, Ian Blanchonette, and Xungai Wang. "Mechanical properties of bifacial fabrics." Textile Research Journal 88, no. 12 (March 28, 2017): 1335–44. http://dx.doi.org/10.1177/0040517517700193.

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This study focuses on the qualitative evaluation of the mechanical properties of bifacial fabrics, which have a knitted structure on one face and a woven structure on the other. Woven, knitted, and bifacial fabrics were produced on a purpose-built machine, using wool/acrylic and polyester yarns. The bifacial fabric was manufactured with the woven structure being a plain weave and the knitted structure being a single jersey. The results of load–extension test showed unique tensile behavior, with two breakages in both the warp and weft directions, representing the woven and knitted structures. The bending length of the bifacial fabric in the weft direction with its knitted face up was smaller than that in the warp direction, and the bending length in the warp direction with its knitted face up was similar to that in two directions with the woven face up. The bifacial fabric demonstrated unique abrasion resistance on two faces, combining the performance of the knitted and woven fabrics in abrasion resistance. The abrasion resistance on the woven face was better than that on the knitted face. The knitted face of the bifacial fabric generally pilled less than the knitted fabric after abrasion over a certain number of cycles.

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23

Wang, Yu Ling, Yin Xiang Kong, and Bao Hua Wu. "Study on Repair Techniques of Loader pin Based on Remanufacturing." Applied Mechanics and Materials 220-223 (November 2012): 83–86. http://dx.doi.org/10.4028/www.scientific.net/amm.220-223.83.

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Pins of loader are damaged easily, and most of them have been abandoned every year. Remanufacturing for pins can reduce waste of natural resources and energy sources. In this paper, pins with different abrasion loss were selected and remanufactured by electrical arc spraying and oxy-acetylene flame spray welding, respectively. Then, the parameters of remanufactured pins such as dimension, surface roughness, surface hardness and crack were measured. Furthermore, the friction and wear characteristics of the repair coating/nickel coating pair were tested under dry lubrication condition with the MRH-3 high-speed ring-block friction and wear testing machine. With the help of SEM (scanning electron microscope) to observe the surface morphology of blocks, abrasion resistance of spray welding coating and spray coating were analyzed. Results indicate that two remanufacturing techniques both can make the scrap pins as new products, but pins which are remanufactured in the way of oxy-acetylene flame spray welding have better abrasion resistance than the way of electrical arc spraying.

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24

Deng, San Peng, Chuan Chuan Cao, Hong Chang Sun, and Xi Bin Wang. "Research on Open CNC System for Rolling Machine Based on PMAC." Applied Mechanics and Materials 496-500 (January 2014): 1313–17. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.1313.

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In order to meet the requirements raised by the surface strengthening and rolling technology of torsion shafts on heavy-duty armored vehicles, an open CNC system, based on PMAC, is developed. The paper covers a detailed description of its hardware and software. Experiments show that the introduction of rolling shafts processed by CNC rolling machines not only improves the surface roughness and abrasion resistance, but also raises endurance strength and production efficiency. Introduction

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25

Lou, Bai Yang, Bao Liang, and Xiao Li. "The Influence of Micro-Arc Oxidation on Corrosive-Wear Behavior of Magnesium Alloy." Applied Mechanics and Materials 55-57 (May 2011): 1785–88. http://dx.doi.org/10.4028/www.scientific.net/amm.55-57.1785.

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Using an alternative pulse current source and in silicate solution electrolyte，a uniform coating on the surface of AZ9lD alloy was fabricated by micro-arc oxidation(MAO) with current density of 40mA/cm2. Friction wear testing machine was used to study the wear behavior under corrosive environment of the film and scanning electron microscopy(SEM)were used to study microstructures of film and worn surface．The result shows that the corrosion resistance of micro-arc oxidation film is large better than that of magnesium alloy. The corrosive solution great weaken the abrasion resistance of the coating. As the influence of the corrosive solution, the wearing mechanism is varying with the loading. Abrasive wear is the main mechanism when the loading is small, if the loading is large enough, the binding force will be destroyed and the coating will peel off from magnesium alloy.

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26

Zhao, Na Na, Yun Hua Xu, Ke Song, Liu Liu Shen, and V. E. Ovcharenko. "Study on TaC Reinforced Iron Matrix Surface Gradient Composites Produced In Situ." Materials Science Forum 848 (March 2016): 38–42. http://dx.doi.org/10.4028/www.scientific.net/msf.848.38.

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Анотація:

Tantalum carbide (TaC) gradient composites were fabricated via in-situ fabrication method from the tantalum plate and gray cast iron. The morphology, phase constituents, micro-hardness, and relative abrasion resistance of the composites were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), micro-hardness tester and abrasive wear testing machine. The surface layer, which was ~160μm thick, was dense ceramic layer composed by ~90% submicron TaC particulates. The highest micro-hardness value of the dense ceramic layer was 13.84 GPa. In the sub-layer, the gradient distribution of TaC particulates reflected in the volume fraction decreased from 90% to 0%. While the micro-hardness value decreased from 10.81 GPa to 4.10 GPa. The metallurgical combination of the interface between the composites and matrix was perfect. The wear resistance of TaC reinforced iron matrix surface gradient composites increased significantly.

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Tęcza, Grzegorz. "Changes in Abrasive Wear Resistance during Miller Test of High-Manganese Cast Steel with Niobium Carbides Formed in the Alloy Matrix." Applied Sciences 11, no. 11 (May 24, 2021): 4794. http://dx.doi.org/10.3390/app11114794.

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Анотація:

High-manganese Hadfield cast steel is commonly used for machine components operating under dynamic load conditions. The high fracture toughness and abrasive wear resistance of this steel are the result of an austenitic structure, which—while being ductile—at the same time tends to surface harden under the effect of cold work. Absence of dynamic loads (e.g., in the case of sand abrasion) causes rapid and premature wear of parts. To improve the abrasive wear resistance of high-manganese cast steel for operation under the conditions free from dynamic loads, primary niobium carbides are produced in this cast steel during the melting process to obtain in castings, after melt solidification, the microstructure consisting of an austenitic matrix and primary niobium carbides uniformly distributed in this matrix. The measured hardness of the tested samples as cast and after solution heat treatment is 260–290 HV and is about 30–60 HV higher than the hardness of common Hadfield cast steel, which is 230 HV. Compared to common Hadfield cast steel, the abrasive wear resistance of the tested high-manganese cast steel measured in the Miller test is at least three times higher at the niobium content of 3.5 wt%. Increasing the niobium content to 4.5 wt%. in the tested samples increases this wear resistance even more.

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28

Chen, Xu Qin, Gui Lan Jiang, and Guang Zhen Cheng. "Research on Material Properties and Heat Treatment of Clamping Blocks." Advanced Materials Research 568 (September 2012): 43–46. http://dx.doi.org/10.4028/www.scientific.net/amr.568.43.

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Анотація:

This paper briefly introduces the basic component of dismantle pillar machine, respectively analyzes the structure of rotating hydraulic clamping device and fixed hydraulic device. Here mainly discussed hardenability carburizing steels 20CrNi3 that selected for clamping block, after carburizing, quenching and low-temperature tempering, obtains mechanical properties as following, intensity limit 950Mpa, yield limit 750Mpa, expanding rate 11%, section shrinkage rate 55%, impact toughness 90J.cm-2, surface hardness HRC58-63. The paper points out that the surface abrasion resistance and center impact resistance of clamping block is obviously better than surface hardening medium-carbon steel, and lamping block has a higher flexural fatigue performance. 40Cr is selected to make locating sleeve, it was quenched and tempered. The steering parts of dish-shape spring is chromalized on surface, so it can resist bending, twist and impact, its surface abrasion resistance is high and service life is long.

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29

Su, Hua Li, Xiao Peng Miao, and Yong Zhang. "The Process Study on Laser Heat Treatment for CNC Machine Tool Guide." Applied Mechanics and Materials 42 (November 2010): 335–38. http://dx.doi.org/10.4028/www.scientific.net/amm.42.335.

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Анотація:

With the continuous development of CNC technology, CNC machine tools run at the higher speed. Cutting force will be greater, which is bound to exacerbate the wear and tear of the machine tool guides. Therefore, new requirements of numerical control machine tool guide surface hardness are proposed. Using Laser surface heat treatment process to scan the guide surface of CNC Machine Tool, the guide can get high hardness hardened layer. After being casted iron HT300 was heat treated by the laser, the microstructure is homogeneous, very fine martensite. Its Surface hardness can get to HV832. The treatment enhances the surface abrasion resistance, scratch-resistant capacity.

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30

Vishvanathperumal, S., and S. Gopalakannan. "Reinforcement of Ethylene Vinyl Acetate with Carbon Black/Silica Hybrid Filler Composites." Applied Mechanics and Materials 852 (September 2016): 16–22. http://dx.doi.org/10.4028/www.scientific.net/amm.852.16.

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Анотація:

Carbon black and silica have been used as the main reinforcing fillers that increase the usefulness of rubbers. In this work the effect of carbon black (high abrasion furnace)/silica hybrid fillers on the mechanical properties, crosslink density and morphological behaviour of ethylene vinyl acetate (EVA) was investigated. EVA reinforced with 0/50, 10/40, 20/30, 30/20, 40/10 and 50/0 phr of carbon black (CB)/silica hybrid filler. The total hybrid filler is kept constant at 50 phr (parts per hundred rubbers) and six different compounds were prepared. EVA, CB and silica followed by compounding on a two roll mill and molding at 180°C and 20 megapascal (MPa) pressure. The mechanical properties such as tensile & tear strength, elongation at break and 100% modulus have been measured at 23°C on universal testing machine. Abrasion resistance, hardness and rebound resilience are studied using DIN abrader, Shore A durometer and vertical rebound resilience respectively. The tensile strength, modulus, tear strength, abrasion resistance, hardness and crosslink density increased with the CB filler content in hybrid filler, reached the maximum value at 50 phr of high abrasion furnace carbon black. Morphological properties of composites were evaluated by scanning electron microscopy analysis.

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31

Serekpayeva, M. A., G. А. Kokayeva, R. K. Niyazbekova, and S. Kardybai. "Investigation of the properties of composite materials based on epoxy resins with microsilica additives." Kompleksnoe Ispolʹzovanie Mineralʹnogo syrʹâ/Complex Use of Mineral Resources/Mineraldik Shikisattardy Keshendi Paidalanu 318, no. 3 (September 12, 2021): 63–70. http://dx.doi.org/10.31643/2021/6445.29.

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Анотація:

The outcomes of studying epoxy-based composite materials supplemented with microsilica are provided in the article. Microsilica was used as a filler. The samples were produced on the epoxy ED-20 basis supplemented with 2, 5 and 10 mas. % of microsilica. The structure and size of finely dispersed filler particles were defined. The obtained composites were tested for resistance to the effect of variable temperatures, corrosive, and abrasion. The study outcomes proved that samples supplemented with 2% of microsilica are more resistant to acid and alkali as well as to petrol than those ones supplemented with 25% of microsilica. Besides the amount of the filler from 2 to 10% doesn’t sufficiently affect the resistance to variable temperatures. When microsilica is added to epoxy resin, it causes scuff resistance increase. The conducted testing proved that the developed composite materials are resistant to the effect of variable temperatures, corrosive, and abrasion. This enables to use these materials as coatings and anti-corrosion protection during machine maintenance.

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32

Schwarz, Ivana, Stana Kovačević, and Ivana Vitlov. "Influential Parameters of Starching Process on Mechanical Properties of Yarns Intended for Multifunctional Woven Fabrics for Thermal Protective Clothing." Polymers 13, no. 1 (December 27, 2020): 73. http://dx.doi.org/10.3390/polym13010073.

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Анотація:

The investigation of influential parameters of the starching process on mechanical properties of yarns intended for multifunctional woven fabrics for thermal protective clothing was performed on four different yarn samples starched on an innovative starching machine, adapted to industrial starching conditions. The starching was conducted with two different processes with different starch mass concentrations: the standard starching process and a newer starching process (with yarn prewetting). Based on the results obtained, it can be concluded that starching positively affects all the properties of tested samples and that the increase of starch mass concentration is not accompanied by the improvement of those yarn properties. Synthetic polymer fibers that achieve satisfactory yarn strength need to be starched with lower starch mass concentrations in order to retain the breaking properties and to be protected from abrasion and static electricity, which occurs during the weaving process. The yarn prewetting starching process shows significantly better results than the standard starching process, especially for aramid yarns, where abrasion resistance increased from 42 to 135%. Therefore, we can conclude that the goal of starching such yarns is aimed at increasing the wear resistance. Linear regressions and correlations between the values of breaking properties and abrasion resistance obtained by the testing and their values that were estimated by the analysis show a high correlation coefficient.

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33

Di, Chang Chun, Kai Bo Cui, Jun Qi Qin, and Da Lin Wu. "Parameters Identification of Johnson-Cook Constitutive Equation for Aluminum Brass." Advanced Materials Research 887-888 (February 2014): 1032–35. http://dx.doi.org/10.4028/www.scientific.net/amr.887-888.1032.

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Анотація:

Aluminum brass HAL66-6-3-2 is abrasion-resistant alloy with high strength, hardness and wear resistance, corrosion resistance is also well, commonly used in the field of marine and ordnance industry. The quasi static and dynamic mechanical properties were tested through the use of electronic universal testing machine and Split Hopkinson Tension Bar (SHTB). Meanwhile, the material stress-strain curve at different temperatures and different strain rates is also obtained. Based on Johnson-Cook constitutive model, using the method of least squares fitting the experimental data to determine the model parameters, fitting and experimental results agree well.

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34

Meding, Judith Tabea, Khorolsuren Tuvshinbayar, Christoph Döpke, and Ferdinand Tamoue. "Textile electrodes for bioimpedance measuring." Communications in Development and Assembling of Textile Products 2, no. 1 (June 26, 2021): 49–60. http://dx.doi.org/10.25367/cdatp.2021.2.p49-60.

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Анотація:

This article deals with the development and comparison of eight different electrodes made out of a cotton fabric substrate, a silver coated yarn and partly conductive finishes, i.e. a PEDOT:PSS Orgacon ICP 1050 dip-coating and a Powersil coating. The purpose is the application especially in the medical field of angiopathy like for bioimpedance measurements during compression therapies. To be able to compare the suitability of the electrodes, various tests have been performed of the coating abrasion resistance, the stability of electrical resistance values, as well as resistance and bioimpedance measurements. Significant differences between the electrodes regarding their resilience and resistance that are visualized in a value-added analysis were found, with one hand-embroidered, one machine-sewn and one commercial electrode showing optimum properties.

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35

Tian, Lin, and Su Ying Chen. "The Properties of the Bamboo Rib Fabric." Advanced Materials Research 482-484 (February 2012): 688–91. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.688.

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Анотація:

In order to understand the fabric properties of the bamboo, 1×1 rib fabrics were woven in knitting machine separately using entire bamboo yarns in 3 shares, cotton 2 and bamboo 1 yarns, and entire cotton yarns in 3 shares. The fabric properties were tested and compared with each other in this paper. The results show that, the bamboo rib fabric has a better drapability, rigidity and abrasion resistance than the cotton fabric, but its bursting strength and wrinkle recovery ability are worse.

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36

Xia, Shao Ling, Lin Qi Zhang, Dong Mei Wang, Wen Jun Zou, Jin Peng, and Shao Kui Cao. "Tribology Study of Nanodiamond Hybrid Polyurethane/Epoxy Interpenetrating Polymer Networks Materials." Advanced Materials Research 557-559 (July 2012): 1533–38. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.1533.

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Анотація:

Tribology behavior of Nanodiamond(ND) polyurethane(PU)/epoxy(EP) interpenetrating polymer networks hybrid materials were tested by friction wear testing machine. Results showed that when EP content was 30%, resultant PU/EP IPNs exhibited best wear resistance. For ND-PU/EP IPNs hybrids, when the ND addition was 0.2wt%, the best wear resistant ability was obtained. Under dry condition, the effect of wear parameters, such as rotational speed, load and central distance to friction and abrasion value were also investigated.

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37

Tusief, Muhammad Qamar, Nasir Mahmood, Nabeel Amin, and Akmal Saeed. "Investigating the Abrasion Resistance and Pilling Properties of Knitted Fabrics: Effect of Yarn Type and Machine Gauge." Pakistan Journal of Scientific & Industrial Research Series A: Physical Sciences 62, no. 1 (April 8, 2019): 52–56. http://dx.doi.org/10.52763/pjsir.phys.sci.62.1.2019.52.56.

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38

Zhang, Ning, Na Shi, Min He, Feng Yang, and Hao Chen. "Study on Wear Behavior of Plasma Arc Cladding of Tunneling Machine Pick." Advanced Materials Research 886 (January 2014): 105–8. http://dx.doi.org/10.4028/www.scientific.net/amr.886.105.

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Анотація:

The working environment of tunneling machine is very harsh. In the high-impact, high-stress, and high abrasion conditions, the cutting pick is a large number of wearing parts in the tunneling process. In this experiment, the tooth head of the cutting pick which was welded by furnace brazing was strengthened by plasma arc powder surfacing with F30 alloy powder, then analyse the surface topography and component, the hardness distribution from the surfacing layer to the interior of the matrix, the friction and wear properties of the surfacing layer, study the microstructure of grinding marks, and the wear mechanism. So as to improve the wear resistance of the cutting pick, to solve the wear failure, and provide a good reference for extending the service life.

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39

Qi, Xiao Qian, and Xu Ping Zhang. "Mechanical and Friction-Wear Properties of MoS₂ Al-Matrix Self-Lubricating." Advanced Materials Research 304 (July 2011): 6–11. http://dx.doi.org/10.4028/www.scientific.net/amr.304.6.

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Анотація:

Al-matrix self-lubricating which added MoS2 as solid lubricant was prepared by casting under variation in content of Si、Fe、Mn、MoS2、Cr3C2. Friction and wear behavior were investigated on MPX-2000 friction and abrasion machine. The microscopic structure and phases were analyzed by metallographic microscopic and XRD. The results show that the main factor influencing friction coefficient is Si, it can reduce the wear rate. Addition of MoS2 can reduce friction coefficient, Fe is used to improve the mechanical properties. Cr3C2 enhances the wear resistance.

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40

Kozyrev, N. A., A. A. Usol’tsev, R. E. Kryukov, A. I. Gusev та I. V. Osetkovskii. "Operation indices of the new cored wire of Fe−C−Si−Мn−Сr−Ni−Mo system". Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 75, № 7 (8 серпня 2019): 860–68. http://dx.doi.org/10.32339/0135-5910-2019-7-860-868.

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Анотація:

To protect and repair details of equipment, subjected to abrasive and shock-and-abrasive wear, a build-up of hard alloy is widely used to increase the wear resistance of details, operating under abrasion conditions. Cored wires of Fe−C−Si−Мn−Сr−Ni−Mo system of type A and B by MIS classification are the main wires used for wear-resistant build-up in Russia. For effective application of building-up wires it is necessary to know the dependence of built-up layer hardness and its wear resistance on mass share of elements included into the composition of the cored wires systems. Influence of chemical composition of he built-up layer, obtained by the building-up with application of new powder systems of Fe−C−Si−Мn−Сr−Ni−Mo, protected by RF patents, on its physical and mechanical properties studied. Based on the results of the multifactor correlation analysis accomplished, dependences of the built-up layer hardness and its wear resistance on mass share of elements included into the composition of the cored wires of Fe−C−Si−Мn−Сr−Ni−Mo system determined. The dependences obtained were used for forecasting of the built-up layer hardness and its wear resistance at changes of the chemical composition of the built-up layer. The tests of JOY 4LS20 mining machine screw protective plates at Kemerovo region mines, built-up by the elaborated cored wire, showed an increase of the resistance by 19.3% comparing with the analog plates built-up by DRATEC wire.

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41

Chairman, Chelliah Anand, Manickam Ravichandran, Vinayagam Mohanavel, Thanikodi Sathish, Ahmad Rashedi, Ibrahim M. Alarifi, Irfan Anjum Badruddin, Ali E. Anqi, and Asif Afzal. "Mechanical and Abrasive Wear Performance of Titanium Di-Oxide Filled Woven Glass Fibre Reinforced Polymer Composites by Using Taguchi and EDAS Approach." Materials 14, no. 18 (September 13, 2021): 5257. http://dx.doi.org/10.3390/ma14185257.

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Анотація:

Two-body abrasive wear behavior of glass fabric reinforced (GC) epoxy and titanium dioxide (TiO2) filled composites have been conducted out by using a tribo test machine. GC and TiO2 filled GC composites were produced by the hand layup technique. The mechanical performances of the fabricated composites were calculated as per ASTM standards. Three different weight percentages were mixed with the polymer to develop the mechanical and abrasive wear features of the composites. Evaluation Based on Distance from Average Solution (EDAS), a multi-criteria decision technique is applied to find the best filler content. Based on the output, 2wt% TiO2 filler gave the best result. Abrasive wear tests were used to compare GC and TiO2 filled GC composites. The abrasion wear mechanisms of the unfilled and TiO2 filled composites have also been studied by scanning electron microscopy. The outcome of the paper suggests the correct proportion of filler required for the resin in order to improve the wear resistance of the filled composites. Taguchi combined with Multi-Criteria Decision Method (MCDM) is used to identify the better performance of the TiO2 filled epoxy composites.

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42

Rudresh, B. M., B. N. Ravikumar, and D. Madhu. "Tribological Response of Polyamide 66 and Polytetrafluroethylene (PA66/PTFE) Blends in Two Body Abrasion Through Multipass Condition." International Journal of Surface Engineering and Interdisciplinary Materials Science 6, no. 1 (January 2018): 1–16. http://dx.doi.org/10.4018/ijseims.2018010101.

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Анотація:

The different weight percentages of 95/5, 90/10, 85/15, 80/20, 75/25 and 70/30 of PA66/PTFE blend composition was investigated as per the ASTM G99 method. The abrasive wear studies were conducted in multipass condition against waterproof silicon carbide (SiC) abrasive paper of 180 and 320 grit at a constant load of 5 N and 10 N with a sliding velocity of 1 m/s for varying abrading distances using pin-on-disc machine. It was found that the wear volume loss of composites increases linearly with increase in applied load and abrading distance. A significant reduction in wear resistance has been observed in terms of wear volume and specific wear rate with increase in addition of PTFE dosage in PA66/PTFE blend. Further, it was observed that the wear volume loss of composites has been decreased with increase in the rank of grit size. Higher wear volumes was due to deep penetration of large sized particles of 180 grit abrasives and less for 320 grit abrasives due to the transition of abrasion wear to sliding. The specific wear rate decreases with an increase in abrading distance for all the tested specimens. Microcutting, microploughing and fatigue loading of abrasive particles are the major failure mechanisms observed during the worn surface analysis using SEM.

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43

Beygi, Hossein, M. Shaterian, E. Tohidlou, and M. R. Rahimipour. "Development in Wear Resistance of Fe-0.7Cr-0.8Mn Milling Balls through In Situ Reinforcing with Low Weight Percent TiC." Advanced Materials Research 413 (December 2011): 262–69. http://dx.doi.org/10.4028/www.scientific.net/amr.413.262.

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Анотація:

In order to increase wear resistance of Fe-0.7Cr-0.8Mn cold work tool steels, low weight percentage of Ti incorporated to the alloy and subsequently, because of high affinity between additive titanium and carbon content in this alloy, low weight percentage of TiC in situ formed in matrix. These composites can be used as the milling balls in mining and cement industries because of their improved wear resistance. Formation, shape, size and distribution of TiC particles within the matrix were studied by optical microscopy equipped with image analyzer, optical emission spectroscopy, scanning electron microscopy and energy dispersive spectroscopy. Also microhardness and density of the samples measured. Abrasion wear tests were carried out using a pin on disc type machine. An experimental design based on Taguchi method was applied to investigate the effect of TiC content, applied load, sliding distance and roughness of SiC abrasive paper on wear behavior of samples. The results show that by reinforcing the Fe-0.7Cr-0.8Mn steels with low weight percentage of TiC, wear resistance of these kind of milling balls significantly increases. Sliding distance has the most influence on wear rate of samples, also weight loss of samples decreases as sliding distance, applied load and roughness of grinding decreases.

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44

Yang, Ke, Jiaqi Li, Yefeng Bao, and Yongfeng Jiang. "Microstructure and wear property of Fe–Cr13–C hardfacing alloy reinforced by WC particles." International Journal of Modern Physics B 31, no. 16-19 (July 26, 2017): 1744030. http://dx.doi.org/10.1142/s0217979217440301.

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Анотація:

Tungsten as the most effective carbide-forming element was added in the Fe–Cr13–C hardfacing alloy to precipitate WC particles. Optical microscope (OM), scanning electron microscope (SEM) and energy-dispersive spectrometer (EDS) were used to investigate the microstructures of the hardfacing alloy. The wear resistance was tested through a slurry rubber wheel abrasion test machine, and the wear behavior was also studied. The results indicate that the microstructures of the hardfacing alloy consist of lath martensite, residual austenite and WC particles. The wear resistance can be significantly improved through the addition of tungsten element being provided by the precipitation of WC particles. And the predominant wear mechanism was microcutting with shallow grooves and spalling.

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45

SILVA, Claudia Maria Zarpelon, José Virgílio de Paula EDUARDO, Milton Edson MIRANDA, Roberta Tarkany BASTING, and Karina Andrea Novaes OLIVIERI. "A method of comparing the wear resistance of various materials used for artificial teeth." RGO - Revista Gaúcha de Odontologia 62, no. 3 (September 2014): 229–34. http://dx.doi.org/10.1590/1981-8637201400030000012170.

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Анотація:

OBJECTIVE: Abrasion resistance of three commercial brands of acrylic resin for artificial teeth, available on the domestic market (Biotone(r), Plus(r) and Vipi Dent Artiplus(r)) was evaluated by a new methodology called "Pirassununga Method ". METHODS: The Manufacturers produced the maxillary central incisor-shaped incisal resin specimens (n=27). These were embedded in chemically activated acrylic resin in an insulated metal matrix to fabricate test specimens, which were flattened on a lathe and refined manually with sandpaper. Wear testing was conducted in an experimental machine at the Vipi dental products factory. In the "Pirassununga Method" a polished metal sphere 4.8 mm in diameter, attached to a rotary device passes over the fixed specimens in programmable cycles, under 5N pressure, using distilled water as lubricant. In each sample, the groove caused by abrasion, was analyzed in two ways: Readout under a microscope to determine the breadth and depth of the groove caused by the ball, and by laser roughness meter readout, which obtained a value Rt. RESULTS: The nonparametric Kruskal Wallis test showed no statistically significant difference between the medians of brands evaluated in the cycles performed (p = 0.936). CONCLUSION: Artiplus(r) Brand showed a lower tendency to wear than commercial brands Biotone(r) and Plus(r) Vipi Dent, with the best performance shown for the IPN polymer.

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46

Ge, Ya Qiong, and Wen Xian Wang. "Experimental Study on Laser Surface Cladding of Ni60 Alloy on AZ31B Magnesium Alloy." Advanced Materials Research 314-316 (August 2011): 3–9. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.3.

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Анотація:

In order to improve the corrosion and wear resistance of AZ31B magnesium alloy, Ni alloy cladding layer which had no crack and hole on AZ31B magnesium substrate was created by a 5kW continuous wave CO2laser. The microstructure was analysed by means of OM(Optical Microscope) and XRD(X-ray Diffraction), the electrochemical corrosion and the abrasion performance were also tested by electrochemical corrosion equipment and the abrasion testing machine. The results show that: the Ni alloy cladding layer can combine with the substrate metallargically, the microstructure of cladding layer is dendritic crystal, and becomes fine significantly from the interface to surface, and the phase of the cladding layer are MgNi2、Mg2Ni、Mg2Ni3Si、Mg2Si and FeNi. Micro-hardness of the cladding layer is 470~601HV which is improved 840%~1102% to the substrate(40~50HV). Average friction coefficient of the cladding layer is 0.321 lower than AZ31B substrate, and the wear mass loss is 91.43% less than the substrate, the wear resistance of the cladded layer has been improved observably. The corrosion voltage of cladding layer moves 136~417mV to plus direction compared to AZ31B magnesium substrate, and the corrosion current of the cladding is 2~3 stages lower.

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47

Wada, Tadahiro. "Tool Wear in Intermittent Cutting of AISI 304 Stainless Steel by Thermally-Sprayed Coatings." Key Engineering Materials 821 (September 2019): 287–93. http://dx.doi.org/10.4028/www.scientific.net/kem.821.287.

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Анотація:

The use of thermal spray coatings is increasing to improve abrasion resistance, erosion and corrosion resistance. To improve the dimensional accuracy or surface roughness, it is often necessary for thermally-sprayed machine parts to be machined by the removal process. As thermally-sprayed coatings often show difficult-to-cut properties, a cutting, grinding, or honing process is usually employed. Replacement of the grinding process with a cutting process is an effective method for improving productivity. Cutting is performed intermittently because there is a hole in the ball part. However, there are no studies on intermittent cutting of thermally-sprayed coatings. In this study, in order to obtain an effective tool material for intermittent cutting of two types of the thermally-sprayed coating AISI 304, the tool wear was investigated experimentally. The results are as follows: (1) In the case of intermittent cutting of Ni-based self-fluxing alloy coating AISI 304, Si3N4 ceramics were considered an effective tool material. (2) In the case of intermittent cutting of thermally-sprayed (WC-Cr-Ni) cermet coating AISI 304, the uncoated cBN having the large grain size of cBN and a high content rate was effective for wear resistance.

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48

Zhang, Shi Sheng, Zhe Liu, and Zhao Xiang Zeng. "Systemic Design of Four Vat Energy-Saving Quenching Machine Controller." Advanced Materials Research 383-390 (November 2011): 1138–43. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.1138.

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Анотація:

Quenching is the technology that a metal work piece heated to propriety temperature for a while is being put into quenching medium suddenly. Quenching can improve the rigidity and abrasion resistance of metal. Making use of PLC to control quenching process, the quenching has simple technology, cheap price, stable function and convenient operation. This quenching system constitutes heating system, quenching liquid cycle system, hydraulic pressure system and electric control system. The quenching machine control system introduced in this thesis has three control modes, Manual, Auto and Try-piece designed utilized S7-PLC. This system can rise and fall worktable, clamp and relax work piece, sway forward and backwards, unload-work piece control high degree by approach-switch, produce many kinds of auto-spring plate, meet the requirement of auto-spring plate nowadays. It is presented in this thesis detailed, control-demand, element list for electric control, I/O distribute list, control LAD and improved measure for system in the end.

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49

Sobula, S., E. Olejnik, and T. Tokarski. "Wear Resistance of TiC Reinforced Cast Steel Matrix Composite." Archives of Foundry Engineering 17, no. 1 (March 1, 2017): 143–46. http://dx.doi.org/10.1515/afe-2017-0026.

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Анотація:

Abstract Wear resistance of TiC-cast steel metal matrix composite has been investigated. Composites were obtained with SHSB method known as SHS synthesis during casting. It has been shown the differences in wear between composite and base cast steel. The Miller slurry machine test were used to determine wear loss of the specimens. The slurry was composed of SiC and water. The worn surface of specimens after test, were studied by SEM. Experimental observation has shown that surface of composite zone is not homogenous and consist the matrix lakes. Microscopic observations revealed the long grooves with SiC particles indented in the base alloy area, and spalling pits in the composite area. Due to the presence of TiC carbides on composite layer, specimens with TiC reinforced cast steel exhibited higher abrasion resistance. The wear of TiC reinforced cast steel mechanism was initially by wearing of soft matrix and in second stage by polishing and spalling of TiC. Summary weight loss after 16hr test was 0,14÷0,23 g for composite specimens and 0,90 g for base steel.

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Lee, Jang-Gun, Jin-Oh Jeong, Sung-In Jeong, and Jong-Seok Park. "Radiation-Based Crosslinking Technique for Enhanced Thermal and Mechanical Properties of HDPE/EVA/PU Blends." Polymers 13, no. 16 (August 23, 2021): 2832. http://dx.doi.org/10.3390/polym13162832.

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Анотація:

Crosslinking of polyolefin-based polymers can improve their thermal and mechanical properties, which can then be used in various applications. Radiation-induced crosslinking can be done easily and usefully by irradiation without a crosslinking agent. In addition, polymer blending can improve thermal and mechanical properties, and chemical resistance, compared to conventional single polymers. In this study, high-density polyethylene (HDPE)/ethylene vinyl acetate (EVA)/polyurethane (PU) blends were prepared by radiation crosslinking to improve the thermal and mechanical properties of HDPE. This is because HDPE, a polyolefin-based polymer, has the weaknesses of low thermal resistance and flexibility, even though it has good mechanical strength and machinability. In contrast, EVA has good flexibility and PU has excellent thermal properties and wear resistance. The morphology and mechanical properties (e.g., tensile and flexure strength) were characterized using scanning electron microscopy (SEM) and a universal testing machine (UTM). The gel fraction, thermal shrinkage, and abrasion resistance of samples were confirmed. In particular, after storing at 180 °C for 1 h, the crosslinked HDPE-PU-EVA blends exhibited ~4-times better thermal stability compared to non-crosslinked HDPE. When subjected to a radiation dose of 100 kGy, the strength of HDPE increased, but the elongation sharply decreased (80%). On the other hand, the strength of the HDPE-PU-EVA blends was very similar to that of HDPE, and the elongation was more than 3-times better (320%). Finally, the abrasion resistance of crosslinked HDPE-PU-EVA was ~9-times better than the crosslinked HDPE. Therefore, this technology can be applied to various polymer products requiring high heat resistance and flexibility, such as electric cables and industrial pipes.

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