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用X射线衍射仪分析了在550℃和900℃热处理的两种蛇纹石粉体的相结构变化,并研究了不同的分散剂对蛇纹石微细粉体在润滑油中的分散性。在MM–200型摩擦磨损试验机上进行摩擦磨损试验,使用的润滑油为基础油和分别含有2种经热处理的蛇纹石粉体的润滑油。借助扫描电子显微镜和能谱仪分析了在上述3种润滑油润滑下#45钢环的表面形貌和成分。结果表明:在900℃热处理后蛇纹石发生相变;用钛酸酯偶联剂进行表面修饰的蛇纹石粉体在润滑油中具有良好的分散性;润滑油中,2种经热处理的蛇纹石都可以在金属摩擦磨损表面形成保护膜。在摩擦过程中,两接触表面上的微凸部分对粉体的研磨作用使粉体粒子表面带有大量的悬挂键,同时接触的金属摩擦副也形成活化表面,从而使粉体颗粒吸附在金属表面。在载荷的作用下,蛇纹石粉体颗粒在磨损表面铺展形成自修复膜。
The phase structure of two serpentine powders heat-treated at 550 ℃ and 900 ℃ was analyzed by X-ray diffractometer. The dispersibility of different dispersants on the serpentine fine powder in lubricating oil was also studied. Friction and wear tests were carried out on a Model MM-200 friction and wear tester using as a base oil and as lubricants each containing two heat-treated serpentine powders. The morphology and composition of # 45 steel rings lubricated with the above three lubricants were analyzed by scanning electron microscopy and energy dispersive spectroscopy. The results show that the serpentine phase changes after heat treatment at 900 ℃. The serpentine powder with surface modified by titanate coupling agent has good dispersibility in lubricating oil. Among the two kinds of lubricating oil, Serpentine can form a protective film on the surface of metal friction and wear. During the rubbing process, the micro-convex part on the two contact surfaces polls the powder with a large amount of dangling bonds on the surface of the powder particles, and the activated metallic friction pair also contacts the activated surface so that the powder particles are adsorbed on the metal surface. Under the action of the load, the serpentine powder particles spread on the worn surface to form a self-repairing membrane.