(Si、Al)型混合物作为锂基润滑脂添加剂的摩擦学性能研究

STUDY ON TRIBOLOGICAL PERFORMANCE OF LITHIUM GREASE USING ULTRAFINE SILICON MATERIAL(Si-Al TYPE)AS ADDITIVE

利用四球摩擦磨损试验机考察了(Si、Al)型混合物作为锂基润滑脂添加剂的摩擦学性能;采用光学显微镜、扫描电子显微镜和能量色散谱仪对钢球磨损表面进行表征。结果表明:(Si、Al)型混合物作为锂基润滑脂添加剂能够显著提高基础脂的抗磨能力,但对减摩性能没有明显改善,当载荷为392N和588N、(Si、Al)型混合物添加量(w)为0.5%时,与基础脂相比,(Si、Al)型混合物润滑脂使钢球磨斑直径分别降低22.37%和48.97%,抗磨效果达到最佳;经过表面修饰,(Si、Al)型混合物粉体的油溶性有了一定程度的提高,但表面修饰并未使粉体的摩擦学性能明显改变;在长磨过程中,磨损表面形成了一层由SiO2,Fe2O3,Al2O3组成的具有良好摩擦学性能的润滑膜层。

A four-ball friction tester was used to investigate the tribological properties of lithium base grease using ultrafine silicon material （Si-Al type）as additive. The steel ball wear surface was characterized by optical microscope,scanning electron microscope （SEM）and energy dispersive spec-trometer. The results show that anti-wearing ability is improved significantly but no effect on the anti-friction performance. Compared with base grease,when the Si-Al additive is 0.5%,the wear scar diam-eters are reduced 22.37%,48.97% at loading of 392 N and 588 N,respectively,indicating the best an-ti-wear effect. After surface modification,the Si-Al additive powder is easier to dissolve in oil,but the tribological performance of the modified powder did not significantly change. Results of SEM and EDX show that in the process of long wear,a lubricating film mainly composed of SiO2 ,Fe2 O3 ,Al2 O3 is formed on the wear surface which has more notable tribological properties.