不同载荷条件下浸银石墨材料水润滑摩擦磨损性能研究  

Tribological behaviors of silver impregnated graphite under different loads in water lubrication conditions

作　　者：李昱鹏[1] 朱小鹏[1] 王伟光 雷明凯[1] 李梦启 LI Yu-peng;ZHU Xiao-peng;WANG We-guang;LEI Ming-kai;LI Meng-qi(Surface Engineering Laboratory,School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China;Harbin Electric Power Equipment Company Limited,Harbin 110060,China)

机构地区：[1]大连理工大学材料科学与工程学院,大连116024 [2]哈尔滨电气动力装备有限公司,哈尔滨150066

出　　处：《炭素》2022年第3期3-9,共7页Carbon

基　　金：国家自然科学基金项目(U21B2078);国家973计划项目(2015CB057306)。

摘　　要：采用环-块式摩擦磨损实验机,研究了水润滑条件下不同载荷和滑动时间对浸银石墨材料摩擦磨损性能的影响,利用表面轮廓仪和扫描电子显微镜对浸银石墨材料在磨合阶段和稳定磨损阶段的磨损行为进行分析和探讨。结果表明:滑动时间1 h内为磨合阶段,随载荷增加浸银石墨在水润滑条件下的摩擦系数降低,比磨损率增大。滑动时间5 h达到了稳定磨损阶段,高载荷导致浸银石墨在水润滑条件下的摩擦系数和比磨损率降低。在浸银石墨的稳定磨损阶段,500 N载荷下的摩擦系数最低,为0.038,700 N载荷下的比磨损率最低,为2.26×10^(-7)mm^(3)/Nm。高载荷条件下,浸银石墨在磨合阶段和稳定磨损阶段展现出相似的磨损机制,浸银石墨表面石墨区域发生较大磨损,增强的银颗粒支撑了水润滑界面间的载荷作用,边界润滑状态的局部流体润滑作用和小尺寸磨屑的自润滑作用,降低了浸银石墨材料的摩擦系数和比磨损率。The friction and wear properties of silver impregnated graphite slid against WC-Ni cemented carbide had been investigated under different loads and sliding time in aqueous environment. The wear surfaces of silver impregnated graphite were observed by surface profilometer and scanning electron microscope to analyze and discuss the wear mechanisms in the runningin stage and the steady wear stage. The results showed that the friction coefficient of silver impregnated graphite decreased and the specific wear rate increased with the increase of loads during the running-in stage within sliding time of 1 h in water lubrication conditions. Both friction coefficient and specific wear rate of the silver-immersed graphite decreased with the increase of loads, when the sliding time increased to 5 h and the sliding interfaces transferred into the steady wear stage. The lowest friction coefficient of silver immersed graphite is 0.038 under the load of 500 N in the stable wear stage. The lowest specific wear rate of silver-immersed graphite is 2.26×10^(-7)mm^(3)/Nm under the load of 700 N. The high loads aroused the similar wear mechanisms of silver impregnated graphite in the running-in stage and the steady wear stage. The severe loss of graphite happened on the surface of silver immersed graphite. The exposed silver bore the main load under the boundary lubrication state. The elastohydrodynamic effect of local water film and the lubrication of transferred tribofilms reduced the friction coefficient and specific wear rate of the silver immersed graphite.

关 键 词：浸银石墨 水润滑 摩擦系数 比磨损率 磨损机制 

分 类 号：TQ165[化学工程—高温制品工业]