表面织构对滑动电接触界面摩擦学行为的影响  

Effect of Surface Texture on Tribological Behavior of Sliding Electrical Contact Interface

作　　者：王东伟 李发强 黄起昌 赵阳[1] 丁昊昊[2] WANG Dongwei;LI Faqiang;HUANG Qichang;ZHAO Yang;DING Haohao(Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu 610213,China;School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中国核动力研究设计院设计研究所核反应堆系统设计技术重点实验室,成都610213 [2]西南交通大学机械工程学院,成都610031

出　　处：《表面技术》2024年第9期137-147,179,共12页Surface Technology

基　　金：国家自然科学基金(52105220);四川省自然科学基金(2022NSFSC1950)。

摘　　要：目的利用表面织构减摩抗磨的优良特性,将其应用于电接触摩擦表面,探讨它对滑动电接触界面摩擦磨损及电接触可靠性的影响。方法利用激光系统制备2种织构,即方坑型表面织构(SPT)和沟槽型表面织构(GT),并与光滑表面的载流摩擦学信号进行对比分析。利用ABAQUS模拟试验,分析界面接触应力、电压和位移的变化特性。结果随着试验的进行,GT表面的摩擦因数逐渐增大,并与光滑表面达到同一水平(0.7),SPT表面的摩擦因数在整个试验过程中始终较低(0.4)。光滑表面在电接触过程中发生了多频振动现象,2种织构表面的振动信号非常微弱,尤其是SPT表面,仅出现了100 Hz的振动频率。光滑表面和GT表面出现较严重的磨损现象,而SPT表面磨损轻微。有限元分析结果表明,表面织构的存在能够避免应力集中现象,GT表面的应力较大(90MPa),且始终分布在沟槽棱边。结论在电接触状态下,2种织构表面均能不同程度地降低界面的摩擦因数和摩擦力,其中SPT表面的减摩降磨效果最显著。GT表面沟槽棱边的损伤和磨屑堆积是导致其逐渐失去减摩效果的主要原因。模拟分析结果证实,SPT表面织构的存在能避免应力集中,有利于改善磨损和降低振动强度。虽然GT表面的最大应力分布也具有时变特征,但是其值较大,且分布在沟槽棱边,导致沟槽织构的减摩效果逐渐减弱。In this work,brass(H65)was selected as the friction pair material,and two kinds of surface textures,i.e.square pit textured(SPT)surface and groove textured(GT)surface were fabricated on the surface of flat specimens by laser system.The width of pit edges and grooves was 100μm,the texture spacing was 300μm,and the texture depth was 20μm.A series of current-carrying tribological tests was carried out on the ball-on-flat friction and wear testing machine.The normal load was set as 1 N and the input current was set as 1 A.The tribological properties of the surface texture and smooth surface under current-carrying condition were compared and analyzed.Furthermore,the test process was simulated by thermal-electric-mechanical coupling analysis method,to reveal the effect mechanism of surface texture on the tribological behavior of the electrical contact interface.The friction coefficient of GT surface was low in the initial stage,which gradually increased with the test and reached the same level as that of smooth surface,at about 0.7.While the friction coefficient of SPT surface remained a low value throughout the whole test,which was about 0.4 during the whole test.Similarly,the friction force measured from GT surface was relatively low in the initial stage,which exhibited a sawtooth shape.With the progress of the test,the sawtooth shape feature gradually disappeared,and the anti-friction ability of the GT was gradually alleviated.Therefore,both of the two textured surfaces can reduce the interfacial friction coefficient and friction force to varying degrees,and the ability of SPT surface in reducing friction is the most significant.The vibration analysis results show that the smooth surface generates friction-induced vibration with multi-frequencies during the friction process,which is 100 Hz,500 Hz and 1000 Hz.While the vibration signals of the two textured surfaces are very weak,especially for the SPT surface,the vibration intensity is very weak and only one frequency of 100 Hz is detected.In the condition of slid

关 键 词：表面织构 滑动电接触 摩擦磨损 试验测试 有限元分析 

分 类 号：TH117[机械工程—机械设计及理论]