Zn/(Si、Al)型化合物复合粉体作为润滑添加剂的摩擦学性能研究

在实验室自制锂基脂，以Zn与(Si、Al)型混合物作为锂基脂润滑添加剂，根据加入量不同设计不同的复配方案，利用四球机考察各复合粉体对润滑脂摩擦学性能的影响，并与市场上成品添加剂的摩擦学性能进行比较。利用光学显微镜、能量散射谱仪对钢球磨损表面进行了分析。结果表明：复合粉体比单剂及成品添加剂在锂基脂中的综合摩擦学性能更优异；在588N载荷下，与基础脂相比，添加复配2(0.5%Zn,0.5%(Si、Al))添加剂的润滑脂作用下的钢球磨斑直径及平均摩擦因数分别降低了54.99%、23.62%。由瞬时摩擦因数变化可知，复合粉体能够有效降低摩擦因数的振幅，有利于减少机器的噪声和增强机器运行的平稳性。在长磨过程中，磨损表面形成了一层由SiO2与Zn组成的具有良好摩擦学性能的润滑膜层。

STUDY ON TRIBOLOGICAL PROPERTIES OF ULTRAFINE SILICON AND Zn COMPOSITE POWDER AS LUBRICATING ADDITIVE

Lithium base grease was prepared in laboratory. Different composites of ultrafine silicon material (Si-Al type) and Zn powder were designed as the Lithium base grease additives. The four-ball friction tester was used to investigate the influence of different composites on the tribological properties. The results were compared with that of the market additives. The worn surfaces were analyzed by means of optical microscope (OM) and energy dispersive X-ray Detector (EDX). The results show that the tribological properties of the composite powders were more excellent than that of the base grease and market product additives. Compared with base grease, the wear scar diameter and the average friction-coefficient using the composite additive (0.5%Zn/0.5%(Si、Al)) was reduced by 54.97% and 23.62%, respectively, at 588N loading. The analysis of the instant changes of friction-coefficient shows that the amplitude of the friction factor can be effectively reduced by the composite powder, which is helpful to reduce the noise and enhance the steady ability of machine. EDX show that a lubricating film mainly composed of SiO2 and Zn is formed on the worn surface that has notable tribological properties.