Tribology and surface topographical analysis of insitu formed BN and Si3N4 in SiC-Al2O3 Ceramic composites

Abstract

Abstract A multi-phase ceramic composite comprising of a SiC matrix reinforced with Si3N4 and BN was prepared by insitu formation during nitridation of Si metal and B2O3. Al2O3 was used as a sintering additive as well as to improve oxidation and corrosion resistance. XRD and SEM techniques were effectively utilized to confirm phases and analyze the evolutionary changes in microstructure. Dry wear tests were conducted to evaluate the composite’s wear resistance. It was discovered that the SiC-Si3N4–BN–Al2O3 composite possessed exceptional properties, such as high hardness, high abrasive wear resistance, and low coefficient of friction. The examination of surface topography using atomic force microscopy indicates that the composites exhibit improved smoothness and enhanced capacity for load bearing. These characteristics make the composite material highly promising for diverse tribological applications. Furthermore, the strengthening and wear mechanisms of this composite were analysed and discussed in this paper.