天然蛇纹石粉体润滑油添加剂的自修复性能及自修复层形成机理研究  

Self-repairing Performance and Formation Mechanism of Self-repairing Layer of Natural Serpentine Powder as a Lubricating Oil Additive

作　　者：高飞[1] 许一[1] 徐滨士[1] 张保森[1,2] 张博[1] 史佩京[1] 

机构地区：[1]装甲兵工程学院再制造技术重点实验室,北京100072 [2]上海交通大学激光制造与材料表面改性重点实验室,上海200240

出　　处：《摩擦学学报》2011年第5期431-438,共8页Tribology

基　　金：国家自然科学基金青年科学基金项目(50904072;50805146);中国博士后科学基金特别资助(第三批);中国博士后科学基金面上项目(20090461452)资助~~

摘　　要：采用RFT-III型往复摩擦磨损试验机(盘-块接触方式)考察了油酸表面修饰天然蛇纹石粉体润滑油添加剂对钢-钢摩擦副的自修复性能;采用显微硬度计测定了试块磨损表面硬度,采用扫描电镜、能谱仪、X射线光电子能谱仪分析了试块磨损表面和截面的形貌、组成、典型元素的化学状态,探讨了天然蛇纹石粉体的自修复机理.结果表明:油酸表面修饰天然蛇纹石粉体作为润滑油添加剂可显著减小钢-钢摩擦副的摩擦系数和磨损率.这是由于其可经由摩擦化学作用而在磨损表面生成具有良好减摩抗磨性能的自修复层所致.自修复层由不同粒径的纳米颗粒密堆积而成,主要成份为Fe2O3和非晶石墨,并含有少量Fe、有机物碎片、含硅有机化合物、SiO2等.A RFT-III reciprocating friction and wear tester（pin-on-block contact mode） was used to investigate the self-repairing performance of oleic acid-surface-capped natural serpentine powder as a lubricating oil additive for steel-steel frictional pair.The microhardness of worn block surface was measured using a hardness meter.The morphology,elemental composition,and chemical state of typical elements on worn steel surfaces and cross-sections were analyzed by means of scanning electron microscopy,energy dispersive spectrometry;and the self-repairing mechanism of the surface-capped natural serpentine powder was explored.Results indicate that the surface-capped natural serpentine powder as a lubricating oil additive can greatly reduce the friction coefficient and wear rate of the steel-steel pair,which was attributed to the formation of a self-repairing layer with good friction-reducing and antiwear performance on worn steel surface viatribochemical reaction in the presence of the lubricating oil additive.The self-repairing layer was composed of densely packed nanoparticles with various sizes.It contained a large amount of Fe2O3 and amorphous graphite as well as a small amount of Fe,organic fragments,Si-containing organic compounds,and SiO2.

关 键 词：天然蛇纹石 润滑油添加剂 自修复性能 自修复机理 

分 类 号：TH117.3[机械工程—机械设计及理论]