共查询到17条相似文献,搜索用时 171 毫秒
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润滑条件下三维编织炭复合材料的摩擦学特性 总被引:1,自引:0,他引:1
采用MM-200型摩擦磨损试验机研究了润滑条件下三维编织炭/环氧复合材料的摩擦磨损性能,探讨了载荷及滑动速度等外界因素的影响;并采用XL30 ESEM电子显微镜观察磨损表面形貌,分析了其磨损机理.结果表明,润滑条件下复合材料的摩擦磨损性能远优于干摩擦,且磨合期较短;随着载荷的增加,复合材料的摩擦系数和比磨损率降低,但滑动速度对摩擦磨损性能的影响很小;润滑条件下的磨损机理主要是磨粒磨损. 相似文献
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采用冷压烧结粉末冶金法制备了铜基受电靴滑块材料。测试了材料的力学性能,用SEM、电滑动磨损试验等方法分析了材料的断口形貌和载流摩擦磨损性能,探讨了其磨损机理。结果表明,该材料的拉伸断裂呈脆性断裂,在非载流条件下,试样的磨损量随着试验载荷的增加而增大;载流条件下,电流产生大量的电弧热促进了石墨的润滑作用;加载10A电流情况下,磨损量随滑动速度的增加先减小后增大;加载30A电流情况下,磨损量随滑动速度的加快而增大。摩擦系数在滑动初始阶段迅速升高,在低速、载流情况下,这一现象更为明显。电流的加入使平稳阶段的摩擦系数相对较低。 相似文献
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目前,鲜见关于过冷度对GH4169高温合金摩擦磨损性能的研究报道。采用复合熔盐净化法对GH4169高温合金进行过冷处理。采用光学显微镜分析过冷合金凝固组织的演化规律,采用硬度计测量其硬度;利用球-盘干摩擦磨损试验研究了不同过冷度下GH4169高温合金的摩擦系数和磨损机理,采用扫描电镜及能谱仪分析其磨损形貌及成分。结果表明:在小过冷度范围内(10 K≤△T63 K),摩擦系数随着过冷度的增大先增大后减小;在中等过冷度范围内(63 K≤△T90 K),摩擦系数随过冷度的增大而增大;在大过冷度范围内(90 K≤△T250 K),摩擦系数随过冷度的增大而减小;过冷GH4169高温合金的磨损机制也分为3个阶段,前期以磨粒磨损为主,中期由接触疲劳磨损向黏着磨损转变,后期为黏着磨损和氧化磨损的竞争机制。 相似文献
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The dry sliding wear behavior of Ti2AlC reinforced AZ91 magnesium composites was investigated at sliding velocity of 0.5 m/s under loads of 10, 20, 40 and 80 N using pin-on-disk configuration against a Cr15 steel disc. Wear rates and friction coefficients were registered during wear tests. Worn tracks and wear debris were examined by scanning electron microscopy, energy dispersive X-ray spectrometry and transmission electron microscopy in order to obtain the wear mechanisms of the studied materials. The main mechanisms were characterized as the magnesium matrix oxidation and self-lubrication of Ti2AlC MAX phase. In all conditions, the composites exhibit superior wear resistance and self-lubricated ability than the AZ91 Mg alloy. In addition, the anisotropic mechanisms in tribological properties of textured Ti2AlC-Mg composites were confirmed and discussed. 相似文献
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Onur Güler Mahir Gökdağ Aykut Çanakçi Müslim Çelebi 《Particulate Science and Technology》2018,36(7):899-907
ZA27 alloy composites reinforced with alumina and graphite nanoparticles are a unique class of advanced engineered materials that have been developed to use in tribological applications. In this study, dry sliding wear behavior of ZA27 alloy matrix hybrid nanocomposites has been investigated. Mechanical alloying and hot pressing methods have been used for the fabrication of these composite materials. Sliding wear tests were conducted using a block-on-disc type sliding wear testing apparatus under unlubricated conditions. Scanning electron microscopy analyses have been carried out to examine the wear surfaces. The results showed that the increase of alumina nanoparticle content can positively influence improvement of the tribological behavior of the hybrid nanocomposites. 相似文献
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Microstructural changes in the surface layer of Ti-6Al-4V alloy after sliding wear in vacuum have been studied by means of scanning and transmission electron microscopy (SEM and TEM). The wear rates of Ti-6Al-4V alloy in vacuum were measured under different sliding velocities and loads. The experimental results showed that a severely deformed layer with a grain size of 50–100 nm and thickness about 70 μm was formed underneath the worn surface. Under the slower sliding velocities, the substructure of the layer had a high dislocation density, while under higher sliding velocities, twins were found to exist in the substructure. A process by which the deformed layer formed has been proposed and the deformation of materials at the contacting spots of the Ti-6Al-4V sample is discussed. 相似文献
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《Materials Letters》2003,57(24-25):3713-3721
Wear behaviour of age-hardened 6063 aluminium alloy was evaluated under dry sliding conditions. A certain part of the aluminium samples was solution treated at 510 °C for 2, 4, 6 and 8 h, water-quenched then aged at 180 °C for 4 h, and the other part was solution treated at 510 °C for 6 h, water-quenched then aged at 180 °C for 1, 2, 3, 4 and 5 h in a muffle furnace. The as-cast and the aged samples were fully characterised before and after the wear testing using hardness, profilometer, scanning electron microscopy (SEM), optical microscopy, X-ray diffraction, and energy dispersive detector (EDS). The wear tests using on a pin-on-disc machine showed that the aging treatments improved the wear behaviour of AA 6063 alloy compared to as-cast samples. 相似文献
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Mohammed Almomani Mohammed T. Hayajneh Majd Draidi 《Particulate Science and Technology》2013,31(3):317-323
ABSTRACTIn this study, zinc aluminum alloy (Zamak) (ZA-27) composites reinforced by different weight fractions of fly ash, alumina (Al2O3), or both particles were produced using compo-casting technique. The composites were subjected to hardness and wear tests. The hardness of the composites increases with increase of the weight fractions of reinforcements. In wear test, the composites were examined under dry sliding conditions using pin on disc apparatus. The wear results revealed that the wear resistance increases with increase of the weight fractions of reinforcements. However, the effect of fly ash particles on the wear resistance of the produced composites is more statistically significant than the effect of Al2O3 particles. The morphology of the composites was examined using scanning electron microscopy (SEM) after the test. The SEM images revealed the existence of adhesion and delamination wear mechanism. 相似文献
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Electroless nickel (EN) coatings are commonly used as an engineering coating for protecting components from corrosion and wear. In the present work, EN was applied to a mild steel substrate and its wear performance under dry as well as lubricated conditions was evaluated for reciprocating sliding wear. A sliding pin made from nodular cast iron was used as the mating surface. In order to assess the wear mechanisms involved in the process, both optical and scanning electron microscopy were utilized to study the wear surface and the debris. The results indicate that the EN coating performed very well under lubricated conditions. In dry tests, extensive adhesion and material transfer was observed. Scanning electron micrographs have been interpreted to analyse various wear mechanisms operating under different loading conditions. 相似文献
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《Materials and Manufacturing Processes》2008,23(4):400-406
In the present article, microstructure, hardness, X-ray diffraction (XRD), thermal gravimetric and differential thermal analysis (TGDTA), and wear performance of a Cast ZA Alloy were studied by using scanning electron microscopy (SEM), XRD analysis, thermal gravimetric and differential thermal analysis and tensile strength, hardness, and wear test techniques. Wear performance of the alloy was investigated on a pin-on-disk wear tester under dry sliding conditions, rubbing against nitrided steel. The wear performance of some specimens was superior to others, for which microstructure and precipitated particulates were important. It has showed that some important phases occurred and improved the wear performance after solution-treatment. 相似文献