几种润滑添加剂的自修复性能研究

STUDY ON SELF-REPAIRING PERFORMANCE OF LUBRICANT ADDITIVES

利用四球摩擦磨损试验机考察了几种润滑添加剂在润滑脂中的自修复性能,借助光学显微镜、能量色散谱仪、电子天平等对自修复效果进行评价。结果表明,改性层状二硅酸钠与传统添加剂复配体系具有较好的减摩抗磨及自修复效果,尤其在载荷为100N、转速为800r/min、温度为60℃、摩擦时间为80min的条件下,具有最佳的自修复效果。添加剂与摩擦表面发生了复杂的物理化学作用,在表面有缺陷的区域(磨损区)沉积,形成了修复表面层。

A phyllosilicate lubricating material was prepared by ball-milling and mixing with tradi- tional additives. The self-repairing performance of lubricant additives in lithium grease was investigated by four-ball friction and wear tester, and the self-repairing effect was evaluated by optical microscope （OM）, energy dispersive spectrometer （EDX）, and electronic balance. The results were compared with that of the traditional additives and the mechanism was discussed. The results indicate that the compos- ite system of the phyllosilicate and traditional additives exhibits excellent tribological and self-repairing properties. It exhibits the best self-repairing effect at 100 N loading, 800 r/min, 60 ℃, and friction time 80 min. It is concluded that the complex physical chemistry reactions occur between additives and friction surface, resulting in a ceramic-like metal that sinks to the surface defects and forms a protective layer, the so-called self-repairing surface layer.