Abstract
Surface texturing techniques have been focused as one of the methods to reduce friction. Previous studies show that surface texturing has the effect of lubricant reservoir, trapping wear debris under boundary and mixed lubrication regimes, and modifying hydrodynamic pressure under hydrodynamic lubrication regime. However, the mechanism of friction reduction phenomena on textured sliding surface has not been clarified yet. In this study, we observed the interference patterns on sliding surface with block-on-disk type testing apparatus in order to try to observe dimpled surface under the sliding contact. Dimples were produced by laser processing. PAO and hexadecane were used in order to investigate the effects of dimpled surface from boundary to hydrodynamic lubrication regimes. We proved that friction property was improved by dimpled surface and observed that the specimen attitude was influenced by dimple dimensions.
