磷型极压抗磨剂对双酯基础油摩擦学性能的影响

Effect of P-Extreme Pressure and Anti-wear Additives on Tribological Properties of Diester Base Oil

采用四球摩擦试验机研究磷酸三甲酚酯(T306)和硫代磷酸铵盐(T307)2种磷型极压抗磨添加剂在双酯中的摩擦学性能;采用扫描电子显微镜(SEM)分析钢球磨损表面的微观形貌,采用X射线光电子能谱仪(XPS)分析摩擦表面典型元素的化学状态,进而对摩擦机制进行探讨。结果表明,在所考察的添加剂添加量和载荷范围内,2种添加剂均可不同程度地改善双酯的摩擦学性能,其中,T307在双酯中展现出更为优异的减摩抗磨以及极压性能,其综合性能优于T306。SEM和XPS分析表明,添加剂分子在摩擦副表面发生了复杂的摩擦化学反应,在摩擦表面上形成了复杂的含有S、P、N等元素的边界润滑膜,从而起到一定的降低摩擦磨损的作用。

Tribologieal properties of tricresyl phosphate （T306） and ammonium thiophsphonate （T307） as extreme pres- sure and anti-wear additives in diester base oils were performed by using a four-ball tester.The morphologies of the worn surface and the chemical state of elements on the worn surface were investigated by scanning electron microscopy （SEM） and X-ray photoelectron spectroscopy（XPS）.The results show that two additives can improve tribological properties of diester base oils in different degrees under the investigated test conditions such as additive content and test load.In particular,T307 exhibits superior friction reducing, anti-wear and extreme pressure properties in diester base oils than T306.SEM and XPS results show that excellent tribological performance can be attributed to the formation of boundary lubrication films containing elements S, P, N on the rubbing surfaces.