In situ Synthesizing Carbon-Based Film by Tribo-Induced Catalytic Degradation of Poly-alpha-Olefin Oil for Reducing Friction and Wear
X Xu and ZB Xu and JF Sun and GB Tang and FH Su, LANGMUIR, 36, 10555-10564 (2020).
Reducing friction and wear in a convenient and economical way has always been desired for industrial production. Here, a carbon-based film with excellent friction-reducing and antiwear abilities was formed in situ from the degradation of poly-alpha-olefin oil (PAO10) on the friction interfaces of the MoN/Pt coating sliding against the Si3N4 ceramic ball during the rubbing process. The MoN/Pt coating was prepared on stainless steel by direct current magnetron sputtering, in which an active 10 nm Pt layer grew well on the MoN layer. The MoN/Pt coating, lubricated by trace amounts of 5 mL PAO10 oil, exhibited a super low friction coefficient of 0.042 and an extremely low wear rate of 1.08 x 10(-8) mm(3) (N m)(-1) after a long duration of applied friction under a high Hertz contact stress of 1.7 GPa. Raman spectra and transmission electron microscopy images revealed that the carbon-based film was composed of amorphous carbon phase dotted with sporadic Pt, MoO3, and SiO2 crystal phases. Molecular dynamics simulations illustrated that the MoN/Pt coating had catalytic action and resulted in the degradation of PAO10 during the rubbing process, which corresponded to the formation of the amorphous carbon-based film on the wear surfaces.
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