Tribological Performance and Tribochemical Mechanism of Lanthanum Dialkyldithiophosphate
来源期刊：JOURNAL OF RARE EARTHS2005年第1期
论文作者：Cheng Xiyun Chen Boshui Wei Yunlong Jiang Song
Key words：lanthanum dialkyldithiophosphate; surface analysis; tribochemical mechanism; rare earhs;
Abstract: 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, La2O3, 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.
Cheng Xiyun1，Chen Boshui2，Wei Yunlong3，Jiang Song1
(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;
4. Logistical Engineering University, Chongqing 400016, China)
Abstract: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, La2O3, 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.
Key words:lanthanum dialkyldithiophosphate; surface analysis; tribochemical mechanism; rare earhs;
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