Ag/MoS_(2)-WS_(2)复合材料的微纳摩擦学特性  

Micro-nano tribological properties of Ag/MoS_(2)-WS_(2)composites

作　　者：曲强[1] 朱修崇 涂有旺 康潇 张雷[2] QU Qiang;ZHU Xiuchong;TU Youwang;KANG Xiao;ZHANG Lei(Beijing Institute of Control Engineering,Beijing 100094,China;State Key Laboratory of 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）》2024年第8期3060-3071,共12页Journal of Central South University:Science and Technology

基　　金：北京控制工程研究所空间驱动与操控机构实验室开放基金资助项目(YF-E-2023-KF003)。

摘　　要：为探明Ag/MoS_(2)-WS_(2)复合材料在解决空间载流摩擦部件高稳定载流和抗磨损问题的作用效果,采用纳米压痕、纳米划痕、表面轮廓仪、扫描电镜等研究微/纳力学尺度下、不同载荷和电流时Ag/MoS_(2)-WS_(2)复合材料的力学行为和摩擦磨损特性。研究结果表明:Ag/MoS_(2)-WS_(2)复合材料在精准微小力作用下具有良好的塑性,压痕模量和硬度与载荷呈非线性关系,其变化机制主要由压痕尺寸效应和塑性变形共同主导;随着载荷增加,Ag/MoS_(2)-WS_(2)复合材料压痕最大深度和塑性深度呈线性增大,当载荷从10 mN增加到20 mN时,压痕最大深度增加约44%,塑性深度增加约51%,而当载荷从20 mN增加到50 mN时,压痕最大深度增加约78%,塑性深度增加约79%,材料的弹塑性转变载荷约为20 mN。在较低载荷(50~100 mN)下,Ag/MoS_(2)-WS_(2)复合材料具有较好的耐磨性。In order to investigate the effect of Ag/MoS_(2)-WS_(2)composites in solving the problems of high stable current-carrying and anti-wear of space current-carrying friction components,nanoindentation,nano-scratching,surface profilometer,and scanning electron microscopy were used to study the mechanical behaviour and friction and wear characteristics of Ag/MoS_(2)-WS_(2)composites at different loads and currents on the micro-and nano mechanical scales.The results show that the Ag/MoS_(2)-WS_(2)composites exhibit good plasticity under the precise small forces,and the indentatioon modulus and hardness show a nonlinear relationship with the load,and the change mechanism is mainly dominated by the size effect and plastic deformation together.With the increase of load,the maximum depth of indentation and the plastic depth of Ag/MoS_(2)-WS_(2)composites increase linearly.When the load increases from 10 mN to 20 mN,the maximum depth increases by about 44%,and the plastic depth increases by about 51%.When the load increases from 20 mN to 50 mN,the maximum depth increases by about 78%,and the plastic depth increases by about 79%,and the transition load is about 20 mN.At lower loads(50−100 mN),the Ag/MoS_(2)-WS_(2)composites have better wear resistance.

关 键 词：Ag/MoS_(2)-WS_(2)复合材料 纳米压痕 纳米划痕 摩擦磨损 

分 类 号：TH117.1[机械工程—机械设计及理论]