磷系极压抗磨剂在酯类油中的摩擦学性能

Tribological Behaviors of P-Extreme Pressure and Anti-Wear Additives in Ester Base Oil

采用四球摩擦试验机研究了多元醇酯(3987)中添加磷酸三甲酚酯(T306)和硫代磷酸铵盐(T307)2种添加剂后的摩擦学性能,采用扫描电子显微镜(SEM)分析了钢球磨损表面的微观形貌,采用X射线光电子能谱仪(XPS)分析了摩擦表面典型元素的化学状态,进而探讨了摩擦机理。结果表明,2种添加剂均可不同程度地改善酯类油的摩擦学性能;当添加浓度越大或试验载荷越高时,T306对改善酯类油的减摩抗磨性能的作用较小,而T307在所考察的浓度或载荷范围内均可有效提高酯类油的减摩抗磨以及承载性能,综合性能优于T306。由于T307可在摩擦表面形成复杂的含有S、P、N等元素的边界润滑膜,从而能够更好地起到降低摩擦磨损的作用。

Tribological properties of polyol ester（3987）with tricresyl phosphate（T306）and ammonium thiophsphonate（T307）as additives were performed by using a four-ball tester.The morphologies and element analysis of the worn surface of steel ball were investigated by scanning electron microscopy（SEM）and X-ray photoelectron spectroscopy（XPS）,and then the tribological mechanism was discussed.The results showed that the two additives could improve the tribological properties of polyol ester in different degrees.In particular,T307 was of the abilities to improve load carrying capacity,anti-wear and friction-reduction properties of 3987 superior to T306 under the same experimental conditions（additive concentration and test load）,due to the formation of boundary adsorption films containing elements S,P,N on the rubbing surfaces.