含纳米添加剂的润滑体系在摩擦过程中的接触电阻研究  

Investigation of the Electrical Contact Resistance between Tribo-pairs Lubricated by Nanoparticle Additive

作　　者：张明[1] 王晓波[1] 伏喜胜[2] 刘维民[1] 

机构地区：[1]中国科学院兰州化学物理研究所固体润滑国家重点实验室 [2]中国石油兰州润滑油研究开发中心,甘肃兰州730060

出　　处：《摩擦学学报》2007年第6期504-508,共5页Tribology

基　　金：国家973项目资助(2007CB607601);西部之光项目资助;甘肃省自然科学基金资助项目(3YS051-A25-003)

摘　　要：采用UMT-2型微摩擦磨损试验机考察了4种纳米颗粒LaF3、Ag、SiO2及Al2O3作为润滑油添加剂在摩擦过程中的接触电阻随时间变化的情况,并由此监测摩擦副表面的成膜状况;采用X射线光电子能谱仪分析4种纳米添加剂润滑下磨损表面典型元素的化学状态,并结合接触电阻测试结果分析纳米油润滑添加剂的润滑机理.结果表明:接触电阻测试能够适时监测添加剂在摩擦副表面的成膜过程,4种纳米润滑油添加剂在边界润滑条件下均能够在磨损表面沉积成膜,其在试验过程中的化学状态没有发生变化,但4种纳米润滑油添加剂在摩擦过程中的成膜性能不同,Ag和LaF3在摩擦过程中的沉积速率、沉积膜厚度及其在摩擦副表面的结合强度优于SiO2和Al2O3.A UMT-2 tribometer was performed to measured the Electrical contact resistance （ECR） between tribopairs lubricated by base oil and base oil containing nano-LaF3 （NLa） ,nano-Ag （NA） ,nano-SiO2 （NS） and nano- Al2O3 （NAl） particles. ECR measuring technique was used to verify the formation of tribo-film generated by nanop- articulate oil additive. The test was done in a reciprocating ball-on-disk mode under boundary lubricated condition at frequency of 15 Hz and normal load of 5 N. Variation of electrical contact resistance between tribo-pairs was observed during the first 250 s when it was lubricated by base oil, then a drop of base oil containing 2% NLa,NA ,NS or NAl was added. ECR was recorded continuously, thus a curve of the ECR versus time was obtained. Because the interface film generated by nanoparticulate oil additive acted as either an insulating barrier or electrical layer for electrical current, ECR was used to visualize the formation of interface film. The formation of tribo-films was further proved by surface analysis on wear scar using XPS. ECR measuring technique provided real-time information about the formation of surface films. The chemical state change of nanoparticles did not happen during rubbing, but its capability of forming a film were different. The deposit velocity and the protective film thickness of NLa and NA were larger than that of.NS and NAl. Friction test performed in the presence of NLa or NA was characterised with the formation of an interface film which was strongly bonded to worn surface.

关 键 词：接触电阻 纳米颗粒 润滑油添加剂 润滑机制 

分 类 号：TH117.3[机械工程—机械设计及理论]