中文摘要：

合成了1种不含硫磷的新型稀土化合物,该化合物在液体石蜡中具有较好的溶解性.热重分析（TGA）表明该化合物热稳定性较好.采用四球摩擦磨损试验机考察了其作为添加剂在液体石蜡中的减摩抗磨性能,结果表明当添加剂的含量为3.0%（w/w）时,与商业化的ZDDP相比具有更好的减摩抗磨效果.当与一定量的有机配体进行复配后,其性能可得到进一步提升.采用X射线光电子能谱（XPS）对磨斑表面进行了分析,结果发现La以羧酸镧和单质镧的形成存在,表明添加剂与金属表面发生了摩擦化学反应.俄歇电子能谱（AES）对元素的深度分布情况表明La向金属基体发生了渗透.含有羧酸镧的吸附膜和含有单质镧、羧酸亚铁的反应膜共同构成了高性能的边界润滑膜.

英文摘要：

A novel oil-soluble rare earth compound（La-Ci8）free of sulfur and phosphorus was synthesized as lubricant additive.The thermogravimetric analysis（TGA）shows that it possesses good thermal stability.The tribological properties of La-Ci8 added to liquid paraffin were evaluated using a four-ball tester.The results show that it exhibits the better anti-wear properties.When combining with a certain amount of organic ligands,it can further improve the friction-reducing and anti-wear properties.The characterizations of the worn surface were analyzed by X-ray photoelectron spectroscope（XPS）and Auger electron spectroscope（AES）.The result indicates that La-Ci8 was adsorbed on rubbed surface,some of which reacted with iron from the steel ball to form La by a redox reaction during friction process.La element deeply penetrated into sublayer of surface.Both the adsorption film containing La（III）carboxylate and the reaction film containing La and Fe（II）carboxylate contribute to the formation of a high performance composite boundary lubrication film.