不同含氧量环境下紫铜/黄铜电接触微动磨损性能研究  

Electrical Contact Fretting Wear Behavior of Copper/Brass under Different Oxygen Content

作　　者：何莉萍[1] 彭金方[2] 蔡振兵[1] 朱旻昊[1] HE Liping;PENG Jinfang;CAI Zhenbing;ZHU Minhao(Tribology Research Institute,Ministry of Education Key Laboratory of advanced materials technology,Southwest Jiaotong University,Sichuan Chengdu 610031,China;Traction Power State Key Laboratory,Southwest Jiaotong University,Sichuan Chengdu 610031,China)

机构地区：[1]西南交通大学材料先进技术教育部重点实验室摩擦学研究所,四川成都610031 [2]西南交通大学牵引动力国家重点实验室,四川成都610031

出　　处：《摩擦学学报》2022年第4期680-689,共10页Tribology

基　　金：四川省科技计划项目支持(2022JDJQ0019)资助。

摘　　要：电连接器常因接触界面磨损发生严重失效,因此有必要研究电接触模式下的微动磨损行为。本文中基于电接触模式和不同环境含氧量(即氧气体积分数分别为10%、20%和30%,后文统一称作10%O_(2)、20%O_(2)和30%O_(2)环境),着重研究含氧量对紫铜/黄铜微动磨损行为与磨损机制的影响。研究发现:10%O_(2)、20%O_(2)和30%O_(2)环境时所对应的摩擦系数稳定值分别为0.77、0.71和0.80,摩擦耗散能和磨损体积的结果变化趋势一致,即10%O_(2)环境下最高,20%O_(2)最低,30%O_(2)介于两者之间,可以推测,含氧量最低条件时的损伤比含氧量高时更严重。通过电接触寿命可以看出,20%O_(2)环境中电接触性能最优,10%O_(2)次之,30%O_(2)最差,不同含氧量时的微动磨损区均发生不同程度的氧化,理论上含氧量越高氧化现象越严重,但10%O_(2)时的抗微动磨损性能最差,30%O_(2)时的电接触性能最差,而类大气含氧量的20%O_(2)环境时的电接触性能和抗磨损性能最佳。结果表明:电接触性能与环境含氧量存有非线性依赖关系,30%O_(2)的环境中氧化最严重,微观形貌为尺寸粗大和团聚状的氧化颗粒,导致其接触电阻高于其余两种含氧量时;而在10%O_(2)环境中,因微动产生的磨屑多,新鲜的磨屑松散覆盖在磨痕区域,极易与氧气发生氧化反应,使其接触电阻高于20%O_(2)环境,但是低于30%O_(2)时,说明环境中含氧量和微动产生的磨屑协同主导铜电接触性能与磨损行为,结合白光干涉、扫描电镜和电子探针等微观分析结果发现,在不同含氧量环境下的铜磨损机制主要表现为氧化、材料转移和剥落。The contact interface of electrical connector often occurs serious failures due to wear,so it is necessary to study the fretting wear behavior in electrical contact mode.Based on the difference of ambient oxygen concentration(10%,20%,30%)in electrical contact mode,this paper focused on the effect of oxygen concentration on fretting wear behavior and wear mechanism of copper/brass.It indicated that the stable values of friction coefficient corresponding to oxygen content of 10% O_(2),20% O_(2) and 30% O_(2) in the environment were 0.77,0.71 and 0.80,respectively.The result of friction dissipation energy was consistent with that of wear volume,i.e.the highest in 10% O_(2) environment,the second in 30% O_(2) environment,the lowest in 20% O_(2) environment.It can be inferred that the damage under the condition of lowest oxygen content was more serious than that under the condition of high oxygen content.It can be seen from the electrical contact life that the electrical contact performance was the best with 20% O_(2),the second with 10% O_(2) and the worst with 30% O_(2).The fretting wear zone was oxidized in varying degrees under different oxygen concentrations,theoretically,the more sufficient the oxygen content,the more serious the oxidation.Among them,the fretting wear resistance was the worst in 10 %O_(2) environment and the electrical contact performance was the worst in 30% O_(2) environment;while the electrical contact performance and wear resistance were the best 20% O_(2) environment.The results showed that there was a nonlinear dependence between the electrical contact performance and the oxygen concentration in the atmosphere.The oxidation wear was the most serious at 30%oxygen concentration,the microstructure was coarse and agglomerated oxide particles which resulted in the higher contact resistance than the other two oxygen concentrations.However,more debris induced by fretting wear was easy to be oxidized at lower concentration with 10%,so the contact resistance was higher than oxygen concentration wit

关 键 词：电接触模式 接触电阻 微动磨损 接触失效 含氧浓度 

分 类 号：TH117.1[机械工程—机械设计及理论]