Correlating surface topography of relaxed layer of ZA/ZrB₂ <i>in situ</i> composites to wear and friction

Abstract

Abstract In the present study, the correlation between the surface topography of relaxed layer and wear and friction has been investigated. For this purpose, the lubricating tribology and surface topography of insitu formed ZrB 2 reinforced Zn-Al (ZA) composites have been studied. The wear and friction properties of composites have been evaluated on a pin-on-disc tribometer under synthetic SAE20W40 motor oil. The worn surface has been studied by SEM, AFM, and profilometer. Results indicate high wear resistance and low COF with smoother topography with ZrB 2 reinforcement. The composite with 9 vol. % ZrB 2 exhibits lower kurtosis and negative skewness values confirming the smoother topography with higher load-carrying capacity. This composite exhibits little wear and COF even at higher loads and sliding distances in the presence of lubricant. A comparative study with existing tribological materials indicates that the present materials have huge potential to be used as bearings and bushings.