The Investigation of Improvement Effects on Friction Properties of Mononuclear MoDTCs having Azaheterocycles by Episulfidation

Tribology Online

Eiji Nagatomi¹  Toru Sugiyama¹  Izumi Takayanagi²  Noriaki Shinoda²  Hiroyukii Tazaki³  Chihiro Bandoh³  Hashimoto Hashimoto³  Masatsugu Kajitan³ 

[1] Automotive Lubricants Group, Central R&D Laboratory, Showa Shell Sekiyu K.K.;Department of Materials and Life Science, Faculty of Science and Technology, Sophia University;

关键词: molybdenum dithiocarbamate;    episulfidation;    lubricant;    additive;    friction;    surface analysis;   

DOI  :  10.2474/trol.5.199

来源: DOAJ

【 摘 要 】

The effects of episulfidation on the frictional properties of mononuclear molybdenum dithiocarbamates having azaheterocycles were investigated. It was shown that the friction coefficients of the lubricants with the episulfided mononuclear molybdenum dithiocarbamates, as measured by the SRV friction test, were lower than those with non-episulfided ones. The friction coefficients of episulfided compounds are also similar to that of binuclear molybdenum dithiocarbamate, which is frequently used as friction modifier in lubricants in actual practice. The extent of decrease in friction in the SRV test differed with the number of carbon atoms in the azaheterocycles of the molybdenum compounds, suggesting that the thermal stability of the compounds affected the friction characteristics of the tested oils. The results from EPMA surface analyses of the disks from the SRV tests suggest that episulfidation of the molybdenum compounds led to effective formation of molybdenum disulfide film by the corresponding oils during the friction tests.

【 授权许可】

Unknown