非硫磷型添加剂在聚脲基润滑脂中的摩擦学性能

以聚α烯烃(PAO40)合成油为基础油,制备了聚脲润滑脂,研究了硫化烯烃棉籽油和两种无硫磷型有机钨和有机钼添加剂对聚脲润滑脂性能的影响。利用往复摩擦磨损试验机分别考察了硫化烯烃棉籽油、有机钨和有机钼在钢-铜摩擦副条件下对聚脲润滑脂摩擦磨损性能的影响,用扫描电子显微镜(SEM)和能谱仪(EDS)观察并分析了铜磨斑表面形貌和磨斑表面主要化学元素组成,考察了3种添加剂对聚脲润滑脂铜片腐蚀的影响。结果表明:PAO型聚脲润滑脂对无硫磷型有机钨和有机钼添加剂的感受性好于硫化烯烃棉籽油,其中以有机钨效果最优,当添加量(w)为2.0%时,摩擦因数和磨痕宽度最小;含有无硫磷型添加剂的润滑脂对铜片的腐蚀也较轻。

TRIBOLOGICAL PROPERTIES OF PHOSPHORUS AND SULFUR-FREE ADDITIVES IN POLYUREA GREASE

Poly α-olefin was used as a base oil to prepare polyurea grease. The properties of phosphorus and sulfur-free organic tungsten and organic molybdenum, sulfurized olefin cotton oil additives in polyurea grease were studied on friction pair of copper disc and steel ball. The reciprocating friction and wear tester was used to evaluate the tribological properties. Scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS) were employed to analyze the worn surfaces of copper. The copper strip tests were also investigated in this article. The results show that the polyurea greases prepared with phosphorus and sulfur-free organic tungsten and organic molybdenum have excellent tribological properties. Among of the additives tested, the organic tungsten is the best, and the results are better than that of the sulfurized olefin cotton oil additive. When the contents of three additives are 2.0%, the friction coefficient and wear width are all the lowest. The corrosion on copper of lubricating greases with phosphorus and sulfur-free additive is lower.