共查询到19条相似文献,搜索用时 109 毫秒
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钛合金耐磨性能较差,对微动磨损十分敏感,使其应用和发展受到了一定的限制。为此,总结了钛合金微动磨损性能的影响因素,综述了钛合金抗微动损伤方法的研究进展。目前,关于钛合金微动磨损的研究主要存在两方面的局限性:(1)对于钛合金微动磨损的研究大多是在单一影响因素及稳定参数下进行的;(2)缺乏关于钛合金在特殊工况下微动磨损的研究。因此,未来对于钛合金微动磨损的研究应多结合工业应用中微动磨损的失效实例,加强多因素、变参数以及特殊工况下的微动磨损研究;在掌握微动磨损失效机理的基础上,根据钛合金的特性,探索新型表面处理技术,进一步改善钛合金微动磨损失效问题。 相似文献
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热喷涂技术在抗微动损伤中的应用 总被引:1,自引:0,他引:1
微动损伤普遍存在于紧密配合部件中,是造成零部件失效的主要祸患之一。采用热喷涂技术,在配合件接触面喷涂抗微动损伤涂层,能有效地降低微动损伤,具有抗损伤效果好、经济效益显著等特点,得到了较广泛的研究与应用。 相似文献
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在PLINT微动磨损试验机上附加电化学测试系统,采用十字交叉接触方式,位移幅值为100μm,法向载荷20、50和80 N条件下,研究NC30Fe合金传热管在氯化钠溶液中的微动腐蚀行为.使用电化学工作站记录微动腐蚀过程中开路电位变化,运用电位扫描法测量微动过程的极化曲线;采用扫描电子显微镜观察磨痕的表面形貌,光学轮廓仪测定磨痕的三维形貌及磨损量.微动磨损使损伤区域金属原子活性增大,腐蚀倾向增大,加速了NC30Fe合金的腐蚀.在氯化钠溶液中,NC30Fe合金由于微动磨损过程产生腐蚀产物膜起到润滑减摩作用,摩擦系数较纯水中降低;但因腐蚀与磨损的交互作用,在氯化钠溶液中的磨损量比纯水中高.氯化钠溶液中的磨损机制主要表现为磨粒磨损和剥层的共同作用. 相似文献
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本文通过对常用单级单吸离心泵叶轮防松方式的研究,发现微动磨损是造成常用叶轮防松装置松动的主要原因,提出了一种避免微动磨损的新的叶轮防松方案,并在煤化工厂的单级泵上进行了试用,取得了较好的效果,该防松方式可以在相关泵上推广使用。 相似文献
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采用超音速等离子喷涂法在1045钢表面制备NiCr-Cr_3C_2涂层,分析涂层的微观结构及化学成分以及涂层的晶粒结构,利用MICROMET-6030显微硬度仪和Nano-test 600纳米压痕仪测定涂层的显微硬度与弹性模量,通过油润滑微动摩擦磨损试验测试涂层的微动磨损性能。结果表明,NiCr-Cr_3C_2涂层为明显的层状结构,具有单晶、纳米多晶与过渡区共存的复杂晶体学结构,显微硬度HV0.3高达998,约为基体材料硬度的3倍,弹性模量为224.6GPa;涂层的微动摩擦因数随载荷增大而减小,随温度升高而增大。喷涂层的抗微动摩擦磨损性能较基体优异,摩擦因数及体积磨损量分别比基体降低36.7%和55.6%。涂层的磨损机理以磨粒磨损和疲劳剥落为主。 相似文献
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Fretting is a form of adhesive wear normally occurring at the contact points gradually leading to premature failure of load bearing medical implants made of titanium alloys. The aim of this work is to characterize the fretting fatigue damage features of PVD TiN coated, plasma nitrided, ion implanted, laser nitrided and thermally oxidized Ti-6Al-4V and Ti-6Al-7Nb contact pairs. The surface layers were characterized. The damage progression during fretting process is apparently explained with tangential force coefficient curves. Plasma nitrided pairs showed highest fretting fatigue life compared to others. PVD TiN coated pairs have experienced early failures due to third body mode of contact interaction with irregular tangential force coefficient pattern. Ion implanted layers showed similar damage as unmodified alloys. Laser nitrided and thermally oxidized pairs experienced early failures due to brittle and irregular modified layers. 相似文献
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Amit Siddharth Sharma Krishanu Biswas Bikramjit Basu 《Metallurgical and Materials Transactions A》2014,45(1):482-500
The dispersion of a softer phase in a metallic matrix reduces the coefficient of friction (COF), often at the expense of an increased wear rate at the tribological contact. To address this issue, unlubricated fretting wear tests were performed on spark plasma sintered Cu-Pb nanocomposites against bearing steel. The sintering temperature and the Pb content as well as the fretting parameters were judiciously selected and varied to investigate the role of microstructure (grain size, second-phase content) on the wear resistance properties of Cu-Pb nanocomposites. A combination of the lowest wear rate (~1.5 × 10?6 mm3/Nm) and a modest COF (~0.4) was achieved for Cu-15 wt pct Pb nanocomposites. The lower wear rate of Cu-Pb nanocomposites with respect to unreinforced Cu is attributed to high hardness (~2 to 3.5 GPa) of the matrix, Cu2O/Fe2O3-rich oxide layer formation at tribological interface, and exuding of softer Pb particles. The wear properties are discussed in reference to the characteristics of transfer layer on worn surface as well as subsurface damage probed using focused ion beam microscopy. Interestingly, the flash temperature has been found to have insignificant effect on the observed oxidative wear, and alternative mechanisms are proposed. Importantly, the wear resistance properties of the nanocomposites reveal a weak Hall–Petch-like relationship with grain size of nanocrystalline Cu. 相似文献
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采用高精度微动磨损试验机SRV Ⅳ研究蒸汽发生器传热管材料Inconel600合金在不同位移幅值下的微动磨损行为,分析了位移幅值对摩擦因数和磨损体积的影响.采用光学显微镜和扫描电子显微镜观察磨损表面和截面的形貌,并用透射电子显微镜对摩擦学转变组织进行观察.结果表明:随位移幅值的增加,摩擦因数和磨损体积逐渐增大,材料的微动行为先后经历以黏着为主的部分滑移区以及滑动为主的完全滑移区;磨损机制也由黏着磨损逐步转变为氧化磨损和剥层磨损的共同作用;微裂纹出现在黏着区域和滑动区域的交界处以及滑动区域内;黏着区氧分布密度和磨痕外基体的相一致,氧化主要发生滑动区域;磨痕亚表层的组织发生了严重的塑性变形,产生纳米化现象,摩擦学转变组织的晶粒尺寸约100 nm,远小于原始组织的15~30μm. 相似文献