Surface composition-lubrication design of Al2O3/Mo laminated composites—Part I: Influence of laser surface texturing on the tribological behavior at 25 and 800 °C

Abstract

This paper proposes a method to improve the tribological properties of Al2O3/Mo laminated composites. Eight types of micro-textures with different patterns and area densities were produced on the surfaces of Al2O3/Mo laminated composites. The friction properties and wear mechanisms at room temperature and 800°C were studied. Results show that the method is effective in achieving composition-lubrication on the surface of laminated ceramics by laser texturing. We demonstrated that the friction coefficient can be reduced to 0.5 and 0.22 at room temperature and 800°C, which were 0.39 times and 0.55 times lower than those of untextured Al2O3/Mo laminated composites, respectively. The contribution of surface texturing to the tribological properties of the laminated composites was mainly related to the increase of the frictional contact pressure, trapping wear debris in the patterns and promoting the formation of lubricating film at 800°C.