二烷基二硫代磷酸镧的摩擦化学机理  

Study on the Tribochemical Mechanism of Lanthanum Dialkldithiophosphate

作　　者：蒋松[1] 陈国需[2] 程西云[1] 陈波水[2] 余红华[1] 

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400044 [2]后勤工程学院,重庆400016

出　　处：《重庆大学学报（自然科学版）》2000年第4期15-17,29,共4页Journal of Chongqing University

基　　金：国家自然科学基金 !(598750 83);重庆大学机械传动国家重点实验室开放基金 !(990 1 )

摘　　要：以稀土元素的摩擦学应用为出发点 ,用四球机考察了自制的新型油溶性润滑油极压抗磨剂———二烷基二硫代磷酸镧 (LaDDP)的减摩抗磨性能 ,用质谱仪模拟其摩擦分解过程 ,通过x射线光电子能谱仪和俄歇电子能谱对边界润滑状态下形成的磨斑表面膜元素组成及化学状态进行分析。提出了其摩擦化学反应机理。试验结果表明 :这种添加剂使ISOVG6 8的摩擦因素明显降低和卡咬负荷提高2 2倍 ,主要原因是在摩擦过程中发生摩擦化学反应 ,生成了由La、La2 O3 、FeS、硫酸盐和磷酸盐组成的边界润滑膜和镧渗透层 。Aiming at the study of rare earth mischmetals as lubricant additives,an new oil-soluble lanthanum dialkldithiophosphate(LaDDP) is prepared as antiwear and extreme pressure additive,and its tribological performances are evaluated by four-ball mechine.The tribological decomposition reactions are simulated through mass spectroscopy.The tribochemical characteristics under boundary lubrication conditions are studied by means of AES and XPS.The tribological mechanism is suggested.The experimental results indicate that LaDDP possesses better lubrication ability than ZDDP.This can mainly be attributed to the formation of boundary film containing La,La 2O 3,FeS,sulphate,phosphate and lanthanum diffused layer.It indicates that the triblogical mechanism suggested is reasonable.

关 键 词：稀土元素 摩擦 化学机理 表面膜 润滑油 

分 类 号：TH117[机械工程—机械设计及理论]