Abstract
The effect of MoDTC with and without ZnDTP on reduction in friction and wear was determined under the partial EHL conditions with a two roller machine, where the experiments were conducted using polyalphaolefin (PAO), polyol ester (POE) and their blended oils as the base fluids. When using PAO as a base fluid, a significant friction and wear reducing effect appeared at a low Mo concentration. On the contrary, the coefficient of friction and the wear amount in POE containing MoDTC with and without ZnDTP increased with increasing Mo concentration. In the blended oils containing MoDTC with a constant Mo concentration the additive effect decreased as the ratio of POE was increased. This indicates that the co-adsorption between POE and MoDTC onto the rubbing surface prevented the formation of an effective boundary lubrication film. The experimental results also showed a friction and wear-reducing effect depends on the ratio of concentration of ZnDTP to that of POE.
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