Abstract
The effects of the concentration of zinc dialkyldithiophosphate (ZDDP) on the tribological properties of a tetrahedral amorphous carbon (ta-C) film in the presence of organic friction modifiers (FMs) were investigated. Friction tests were conducted under lubrication with poly-alpha-olefin (PAO) and PAO containing glycerol-mono-oleate (GMO), tallow-diethanol-amine (TDEA), ZDDP, GMO+ZDDP, and TDEA+ZDDP. For PAO+GMO+ZDDP, the friction coefficients increased as the concentration of ZDDP increased. For PAO+TDEA+ZDDP, the ultralow friction was observed at the ta-C/ta-C contact regardless of the concentration of ZDDP. Surface analyses demonstrated the combination of TDEA and ZDDP promoting the formation of sulfur-rich tribofilms, which play important roles in the low friction of the ta-C film.
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