Tribological Performance and Tribochemical Mechanism of Lanthanum Dialkyldithiophosphate  

作　　者：蒋松 韦云隆 程西云 陈波水 

机构地区：[1]Department of Mechatronic Engineering, Shantou University Shantou 515063, China [2]Logistical Engineering University, Chongqing 400016, China [3]Chongqing Institute of Technology, Chongqing 400050, China

出　　处：《Journal of Rare Earths》2005年第1期20-23,共4页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (59875083)

摘　　要：Lanthanum dialkyldithiophosphate (LaDDP) was synthesized. Its tribological behavior was evaluated with a four-ball machine. The results show that LaDDP possesses very good antiwear and friction reduction capacities. The boundary film composition, characterized by X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES), reveals that the antiwear and friction reduction layer containing metallic La, La_2O_3, phosphate, sulphate, tribopolmer and lanthanum tribodiffusion layer prevent the rubbing pairs from contacting directly and result in better extreme pressure and antiwear behavior. The microhardness of frictional surface increases by 25%. It indicates that the frictional surface is strengthened by La tribodiffusion layer. The tribological decomposition reactions of LaDDP are simulated through mass spectroscopy. Its tribological mechanism was suggested.Lanthanum dialkyldithiophosphate (LaDDP) was synthesized. Its tribological behavior was evaluated with a four-ball machine. The results show that LaDDP possesses very good antiwear and friction reduction capacities. The boundary film composition, characterized by X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES), reveals that the antiwear and friction reduction layer containing metallic La, La_2O_3, phosphate, sulphate, tribopolmer and lanthanum tribodiffusion layer prevent the rubbing pairs from contacting directly and result in better extreme pressure and antiwear behavior. The microhardness of frictional surface increases by 25%. It indicates that the frictional surface is strengthened by La tribodiffusion layer. The tribological decomposition reactions of LaDDP are simulated through mass spectroscopy. Its tribological mechanism was suggested.

关 键 词：lanthanum dialkyldithiophosphate surface analysis tribochemical mechanism rare earhs 

分 类 号：TH117.2[机械工程—机械设计及理论]