表面机械滚压处理T2紫铜的载流摩擦学行为  

Tribological behavior of T2 copper induce by surface mechanical rolling treatment under current carrying condition

作　　者：庄辉 季德惠 沈明学[1,2] 刘少鹏 肖叶龙 熊光耀 ZHUANG Hui;JI De-hui;SHEN Ming-xue;LIU Shao-peng;XIAO Ye-long;XIONG Guang-yao(Key Laboratory of Conveyance and Equipment,Ministry of Education,East China Jiaotong University,Nanchang 330013,China;State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学载运工具与装备教育部重点实验室,南昌330013 [2]华东交通大学轨道交通基础设施性能监测与保障国家重点实验室,南昌330013

出　　处：《中国有色金属学报》2023年第2期521-530,共10页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(52061012,52105184);江西省杰出青年基金资助项目(20212ACB214003)。

摘　　要：采用表面机械滚压处理(SMRT)技术在T2紫铜棒表面制备出厚度约306μm的梯度纳米细晶结构层(GNG),考察0 A和5 A载流条件下有无SMRT处理(细晶和粗晶)铜棒的往复摩擦学行为,探讨载流条件及SMRT处理对T2紫铜棒载流摩损性能和接触电阻的影响。结果表明:与粗晶铜棒相比,在0 A和5 A载流条件下,SMRT处理后铜棒的摩擦因数分别从约0.68和0.77降低到约0.35和0.44,分别降低约48.5%和42.9%;磨痕宽度分别从约708.6μm和766.3μm减小到约186.9μm和236.2μm,降幅分别约73.6%和69.2%;表面粗糙度S a从约3.9和5.1下降到约0.18和0.48,降幅分别约为95.4%和90.6%,表明SMRT处理可以显著增强粗晶T2铜棒的耐磨性。SMRT处理前后铜棒的磨损机制由以严重疲劳磨损和磨粒磨损为主转变为以磨粒磨损和氧化磨损为主,此外,SMRT处理后铜棒接触电阻变化幅值显著降低,表现出优异的载流稳定性。A gradient nanostructured layer(GNG)with thickness of about 300μm was prepared on the surface of T2 copper bar by surface mechanical rolling treatment(SMRT).And the reciprocating tribological behavior of copper bars with or without SMRT treatment(coarse and fine grain)under 0 A and 5 A current-carrying conditions were investigated.The effects of current carrying conditions and SMRT treatment on the tribological properties and contact resistance of T2 copper bars were investigated.The results show that,under 0 A and 5A current,the friction coefficients(COF)of copper bars with or without SMRT treatment decrease from 0.68 and 0.77 to 0.35 and 0.44,decreasing by about 48.5%and 42.9%,respectively.The widths of wear marks decreases from 708.6μm and 766.3μm to 186.9μm and 236.2μm,decreasing by about 73.6%and 69.2%,respectively.The surface roughness(Sa)decreases from 3.9 and 5.1 to 0.18 and 0.48,decreasing by about 95.4%and 90.6%,respectively,indicating that SMRT treatment can significantly enhance the wear resistance of T2 copper bar.After SMRT treatment,the dominant wear mechanism of copper bars change from severe fatigue wear and abrasive wear to abrasive wear and oxidation wear,and the fluctuation of contact resistance is smaller,showing excellent current carrying stability.

关 键 词：紫铜 表面机械滚压处理 载流摩擦磨损 梯度纳米结构层 载流性能 

分 类 号：TH117[机械工程—机械设计及理论]