Study on Preparation and Reaction Mechanism of B4C/β-Sialon/SiC/Al2O3 Composite Powder

B4C, Si, Al, and γ-Al2O3 were used as raw materials, formed β-Sialon SiC in situ by solid-state reaction for preparation of B4C composite powder. grains are uniformly dispersedly distributed the The effects molar ratio nitridation temperature soaking time phase composition, microstructure powder studied. When Si is 2: 3, with columnar growing alternately can be prepared after at 1500°C 4 h. liquid melting high promoted dissolution formation SiC. was increased or prolonged, gas volatilization Al intensified, AlN whiskers tend to