茂金属聚α烯烃制备的复合锂基润滑脂摩擦学性能研究

分别以茂金属聚α烯烃(mPAO)和聚α烯烃(PAO40)为基础油、复合锂皂为稠化剂制备复合锂基润滑脂,采用高速往复摩擦磨损试验机考察MoDTC,MoS2,ZnSiO4添加剂及其复配剂对复合锂基脂摩擦磨损性能的影响,用扫描电子显微镜(SEM)和能谱分析仪(EDS)对钢球摩擦副磨斑形貌进行观察和分析。结果表明:在mPAO基础脂中分别加入5%MoDTC,2%MoS_2,4% ZnSiO_4,或1%MoS_2+2% ZnSiO_4时制备的复合锂基润滑脂具有良好的减摩抗磨性能。

TRIBOLOGICAL PROPERTIES OF METALLOCENE POLY ALPHA-OLEFINS LITHIUM COMPLEX GREASE

Using metallocene poly alpha-olefins (mPAO) and poly α-olefin (PAO40) as base oils, and complex lithium soap as thickener, a kind of lithium complex greases were prepared. The high-speed reciprocating friction and wear testing machine was used to investigate the effect of molybdenum disulfide, molybdenum dithiocarbamates, zinc silicate additives and their mixtures on the friction and wear properties of complex lithium grease on steel - steel friction pair. Scanning electron microscopy (SEM) and energy spectrum analysis (EDS) were employed to analyze the worn surfaces. The tribological properties of the composites are significantly improved with addition of 5% molybdenum dithiocarbamate, 2% molybdenum disulfide or 4% zinc silicate in the lithium grease. The lithium grease using mPAO as base oil has better tribological properties compared to poly α-olefin as base oil.