Effect of Hybridizing MoS2 on the Tribological Behaviour of Mg–TiC Composites

Abstract

The present investigation deals with the development of magnesium–TiC–MoS2 hybrid composites by powder metallurgy route. Powder morphology of the matrix and reinforcement powder particles has been carried out using particle size analyzer, scanning electron microscopy (SEM) and X-ray diffraction. The microstructural study confirms the uniform distribution of TiC and MoS2 particulates throughout the magnesium matrix. The hybrid composite displays increase in hardness when compared to base material, which is attributed to the presence of hard TiC. Furthermore, a slight decrease in hardness is noted for the hybrid composite when compared to Mg–TiC composite which may be due to the presence of MoS2 particles. The tribological properties of these composite materials were investigated by pin-on-disc wear test apparatus under dry sliding condition. The wear resistance of the developed composites improves significantly when compared to that of the magnesium matrix due to the courteous effect offered by both the reinforcements. The SEM analysis was carried out on the worn surfaces to understand the wear mechanisms. In addition to that wear debris analysis was conceded for better sympathetic of wear mechanisms.