油溶性纳米Cu在微动磨损条件下的自修复行为与机理研究  

Study of Self-repair Property and Mechanism of Nano Cu as Lubricating Oil Additives under Oscillating Friction and Wear

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

出　　处：《摩擦学学报》2005年第6期504-509,共6页Tribology

基　　金：国家自然科学基金资助项目(50235030)

摘　　要：将质量分数为1%的油溶性纳米铜分散于SJ 15W/40汽油机油中并以SJ 15W/40汽油机油为参比油、采用SRV型微动摩擦磨损试验机考察了油溶性纳米铜添加剂的摩擦磨损自修复行为.用表面轮廓仪、显微硬度计、扫描电子显微镜以及X射线光电子能谱仪等对摩擦副磨损表面进行了分析.结果表明,在本试验条件下,与参比油相比,添加油溶性纳米铜的SJ 15W/40汽油机油的摩擦系数和磨损体积损失均有大幅降低,且在达到一定试验时间和载荷后出现磨损负增长,表现出了明显的磨损自修复效应.油溶性纳米Cu能够改善摩擦副的表面磨损状况,使其得到整平和修复,其机理主要为软金属纳米颗粒(纳米Cu颗粒)在摩擦过程中由于物理、化学和电化学等作用而沉积于摩擦表面,形成含有单质铜的自修复沉积膜,从而起到了磨损自修复作用.Oil-soluble nano-Cu additives were synthesized in laboratory. 1%nano-Cu particle was dispersed in SJ 15W/40 gasoline engine oil （NC） and SJ 15W/40 gasoline engine oil （SJ） was used for comparing. Its self-repair properties as lubricating oil additives were investigated by SRV oscillating friction and wear tester. Test condition are room temperature,frequency 25 Hz,stroke 1 mm. Self-repair properties of nano-Cu additives in connection with distance and load were, investigated in terms of variation in friction coefficient and wear volume loss with time and load. Reqardless of time and load, friction coefficient and wear volume lubricated by NC are all lower relative to SJ 15W/40 oil. When load was 400 N, experiment time was as longer as 1.5 h instead of 0.5 h, also when load more than 500 N wear volume will minish than foregoing. These phenomena represent wear self-repair effect evidently. Analytical tools such as profilometer, microsclerometer, scanning electron microscopy, X-ray photoelectron spectroscopy were used to analyse worn surface of steel discs. Profilometer and micro-sclerometer analysis results show that 1% nano-Cu additives contained in SJ 15W/40 lubricating oil have very good self-repair performance to steel-steel rubbing relative to SJ 15W/40 lubricating oil, it can level off and mend the worn surface. Analysis of scanning electron microscopy,X-ray photoelectron spectroscopy indicate that nano-Cu additive take place in situ tribochemistry reaction and built a self-repair deposit soft film composed of copper on the steel discs surface. The film has lower shear intensity and significant reduced friction coefficient, at the same time it can compensate wear loss of rubbing.

关 键 词：油溶性纳米Cu 微动磨损 磨损自修复 磨损机理 

分 类 号：TH117.3[机械工程—机械设计及理论]