Abstract
The present study describes friction properties of polymer overlay containing molydenum disulfide (MoS2) fine particles formed on the aluminum cast alloy (AC8A) surface in lubricated condition. Poly amide imide (PAI) was employed as an overlay material and fabricated on the micro dimpled surface using a spin coating process. The overlay thickness was approximately 10 μm and the different layer structures of the overlay containing 10 vol.% of MoS2 were prepared. The friction properties evaluated with a 3-ball on disc type testing apparatus showed that the friction coefficient of the overlay was low and stable from the beginning of the experiment in comparison with the case of non-overlay substrate. Moreover, the overlay with the thin surface layer containing MoS2 showed quickly transition to the stable friction coefficient. This result indicates that the MoS2 alignment in the surface layer became higher by the high-speed spin coating.
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