Microstructure and Wear Resistance of ZrO₂/SiC-WSi₂/MoSi₂ Ceramic Nanocomposites

ZrO2/SiC-WSi2/MoSi2 ceramic composites were prepared by hot-pressed sintering after ZrO2 and SiC nanoparticles were dispersed and mixed by wet-milling.The microstructure and wear resistance of the composites were investigated.The compositing of SiC and ZrO2 nanoparticles and alloying of W induced the grain of ceramic composites fined.The hardness and wear resistance of ceramic composites are much higher than those of MoSi2 ceramic.The wear mechanism is mainly adhesive wear accompanied with microfracture induced by fatigue.