银基纳米自润滑复合材料的润滑膜演变行为  

Microstructural evolution of lubricating films of silver matrix selflubricating nanocomposite

作　　者：张强[1] 张可墨 周元子[1] 曲强[1] 康潇 ZHANG Qiang;ZHANG Kemo;ZHOU Yuanzi;QU Qiang;KANG Xiao(Beijing Institute of Control Engineering,Beijing 100094,China;State Key Laboratory for Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]北京控制工程研究所,北京100094 [2]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2020年第11期3144-3151,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(11972078)。

摘　　要：采用热压烧结法制备具有低摩擦因数和超低磨损率的银基纳米自润滑复合材料,并研究润滑膜的化学组成、微观结构和演变规律。研究结果表明:润滑膜由WS2和MoS2组成,降低滑动速度会增加润滑膜中WS2和MoS2的含量以及润滑膜的厚度。平稳的摩擦因数曲线归因于润滑膜形成和消耗之间的动态平衡,当润滑膜的厚度超过80 nm时,摩擦因数曲线会比较平稳。在真空摩擦磨损的初始阶段,MoS2颗粒比WS2更容易黏附在磨损表面形成润滑膜,使得该复合材料既可以在初始阶段迅速形成润滑膜,又可以在稳定阶段保持低摩擦因数。因此,银基纳米自润滑复合材料可以作为卫星用的滑动电接触材料。A silver matrix self-lubricating nanocomposite with low friction coefficient and ultra-low wear rate was prepared by hot pressing sintering method,and the chemical composition,microstructure and microstructural evolution of the lubricating films were fully evaluated.The results show that the lubricating films are composed of WS2 and MoS2,and decreasing the sliding speed will increase the content of WS2 and MoS2 as well as the thickness of the lubricating films.The smooth friction coefficient curve is attributed to the dynamic balance between the formation and consumption of the lubricating films.When the thickness of the lubricating films exceeds 80 nm,the friction coefficient curve will be relatively smooth.In the initial stage of vacuum friction and wear,MoS2 particles are more likely to stick to the worn surface to form a lubrication film than WS2,which makes Ag-WS2-MoS2 composite not only form a lubrication film rapidly in the initial stage,but also maintain a low friction coefficient in the stable stage.Therefore,the silver matrix self-lubricating nanocomposite can be used as the sliding electrical contact materials for satellites.

关 键 词：润滑膜 金属基自润滑复合材料 摩擦学行为 复相固体润滑剂 

分 类 号：TH117.1[机械工程—机械设计及理论]