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采用高速往复摩擦磨损试验机考察了载流和无载流条件下蒙脱石作为添加剂在复合锂基润滑脂中的摩擦学性能,用高倍显微镜、扫描电子显微镜和X射线能谱分析仪对试块磨斑表面进行表征,探讨了其减摩抗磨及自修复机理。结果表明:蒙脱石的加入很好地改善了复合锂基润滑脂的减摩抗磨性能,并具有一定的自修复功能。在无载流条件下,当无机蒙脱石的添加量为1.6%时,其摩擦因数和磨痕宽度分别比基础脂降低约12.6%和38%。这是由于其摩擦化学作用在磨损表面生成具有良好减摩抗磨性能的自修复层。自修复层表面较为光滑平整且具有多孔状特征,主要由Fe、Mg、Al等元素构成,有效地降低了摩擦磨损。在载流条件下,自修复层能减轻电弧对摩擦接触面的侵蚀。
The tribological properties of montmorillonite as additive in lithium complex grease were investigated by high speed reciprocating friction and wear testing machine. The tribological properties of montmorillonite as additive in lithium complex grease were investigated by high power microscope, scanning electron microscope and X-ray energy spectrum analyzer The surface of the plaque was characterized and its anti-friction and self-repairing mechanism was discussed. The results show that the addition of montmorillonite improves the anti-friction and anti-wear properties of lithium complex grease and has a certain self-healing function. Under no-current condition, the friction factor and wear scar width were reduced by 12.6% and 38% respectively when compared with the base fat when the amount of inorganic montmorillonite was 1.6%. This is due to its tribochemical effect on the wear surface to produce a self-healing layer with good friction and wear resistance. The surface of the self-repairing layer is relatively smooth and porous, and is mainly composed of Fe, Mg, Al and other elements, effectively reducing the friction and wear. Under current-carrying conditions, self-healing layers reduce the arc erosion of the frictional contact surfaces.