两种无灰型含磷/硫润滑添加剂在菜籽油中的摩擦学性能及膜分析

以合成的两种无灰型含磷/硫化合物为润滑添加剂, 以可生物降解的菜籽油作为基础油, 用四球机研究了体系的抗磨减摩性能, 以X射线光电子能谱(XPS)和X射线吸收精细结构光谱(XANES)对所形成的摩擦膜和热膜进行了表面分析, 并初步探讨了其润滑机理. 摩擦学研究结果表明, 两种含磷/硫化合物作为菜籽油的润滑添加剂时, 具有良好的抗磨减摩性能. XPS和XANES分析结果显示, 摩擦膜和热膜主要由吸附层和反应层组成; 在表面膜中, 磷主要以磷酸盐或焦磷酸盐等形式存在, 而硫主要以硫酸盐的形式存在. 研究结果还表明, 摩擦热在两种不同添加剂的摩擦膜形成过程中发挥着不同的作用.

Tribological Behaviors and Film Analysis of Two Ashless Phosphorus/ Sulfur-Containing Additives in Rapeseed Oil

Two synthetical ashless phosphorus/sulfur-containing compouds were used as additives in biodegradable rapeseed oil (RSO). Their anti-wear and friction-reduction performances as lubricating oil additives were evaluated using four-ball tester. The chemistry of their tribofilms and thermal films was analyzed with X-ray photoelectron spectroscopy (XPS) and X-ray absorption near-edge spectroscopy (XANES), The results showed that the two phosphorus/sulfur-containing compounds possessed rather good anti-wear properties and friction-reducing performances. According to the XPS and XANES analytic results, the tribofilms and thermal films generated from the additives were mainly composed of adsorbed-film and reaction film, in which phosphate and pyrophosphate were main existence form of P, FeSO4 was the main existence form of S. The results also showed that tribo-heat played different roles in the formation of tribofilms generated fromthe two different additives.