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实验室自制了锂基润滑脂,通过四球试验研究Zn作为锂基润滑脂添加剂在不同工况条件的摩擦学性能,利用光学显微镜和EDX分析了磨斑表面形貌及元素组成,探讨了Zn的润滑作用机理,并对Zn与SiO2不同复配方案的摩擦学性能进行了研究。结果表明:在低载荷条件,Zn能更显著地提高锂基润滑脂的抗磨性能;在中高载荷条件,Zn同时具有减摩抗磨性能,但对PB值的提高没有太大帮助。EDX能谱分析表明磨斑表面存在特征Zn元素,说明Zn能够在摩擦表面沉积,形成摩擦学性能显著的表面润滑层;同时,Zn与硬质颗粒SiO2在适宜的复配比例时具有一定的协同效应,能提高锂基润滑脂的摩擦学性能。
The lithium-based grease was prepared in the laboratory. The tribological properties of Zn as a lithium grease additive in different working conditions were studied by four-ball test. The surface morphology and elemental composition of the wear scar were analyzed by optical microscope and EDX. Lubrication mechanism and the tribological properties of different compounding schemes of Zn and SiO2 were studied. The results show that Zn can significantly improve the wear resistance of lithium-based grease under low loading conditions. In medium and high loading conditions, Zn has both anti-friction and anti-wear properties, but not much to PB. EDX EDS analysis showed that there is a characteristic Zn element on the surface of the wear spot, indicating that Zn can be deposited on the friction surface to form a surface lubricating layer with significant tribological properties. Meanwhile, Zn and the hard particle SiO2 have a certain synergy Effect, can improve the tribological properties of lithium-based grease.