Electrical sliding friction and wear properties of Cu-MoS2-graphite-WS2 nanotubes composites in air and vacuum conditions
Electrical sliding friction and wear properties of Cu-MoS2-graphite-WS2 nanotubes composites in air and vacuum conditions
复制标题
Cu-MoS2-石墨-WS2纳米管复合材料在空气和真空条件下的电滑动摩擦磨损性能
DOI：
10.1016/j.msea.2012.10.014
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发表时间：
2013-01-10
期刊：
影响因子：
6.4
通讯作者：
Qian, Gang
中科院分区：
文献类型：
--
作者：
Huang, Shiyin;Feng, Yi;Qian, Gang
采用粉末冶金热压法制备了Cu-MoS 2-石墨-WS 2纳米管复合材料。采用块-环摩擦磨损试验机，分别在空气和真空条件下，以不同电流与Cu-5wt%Ag合金环摩擦，研究了复合材料的摩擦学性能和接触电压降。用扫描电子显微镜（SEM）和X射线光电子能谱（XPS）对摩擦膜进行了表征。结果表明，由于MoS 2和石墨混合物在空气中的润滑协同作用和石墨在真空中的有限润滑性能，空气中的摩擦系数和磨损率低于真空中的摩擦系数和磨损率。由于电流释放产生的焦耳热，摩擦系数和磨损率随着电流密度的增加而逐渐增大。由于摩擦膜的逐渐形成，使复合材料和圆环接触界面的自然粗糙度由金属-金属型转变为金属-膜-金属型，接触电压降在初始阶段较低，然后逐渐增大到一个稳定值。(C)2012爱思唯尔有限公司版权所有。
Cu-MoS2-graphite-WS2 nanotubes composites were fabricated by the P/M hot pressing method. The tribological properties and contact voltage drops of the composites were investigated using a block-on-ring friction and wear tester in air and vacuum respectively, rubbing against Cu-5 wt% Ag alloy ring with different electric current. Tribo-films formed on the worn surfaces were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Results illustrated that the friction coefficients and wear rates in air were lower than those in vacuum due to the synergistic effect of lubrication from the mixture of MoS2 and graphite in air and the limited lubrication properties of graphite in vacuum. The friction coefficients and wear rates increased gradually with the increasing current density because of the additional Joule heat resulting from the release of current. The contact voltage drops were low in the initial stage, and then increased to a stable value owing to the gradual formation of tribo-films on the sliding surface which changed the nature asperities from metal-metal to metal-film-metal type on the contact interfaces of composites and rings. (C) 2012 Elsevier B.V. All rights reserved.