Abstract
Three-dimensional SiC fiber-reinforced SiC_f/SiC composites were fabricated by melt infiltration (MI) method using a Si-Hf alloy. The matrix of SiC_f/SiC composites consisted of SiC and small amounts of Si and HfSi_2- The molar ratio of Si and HfSi_2 was 82.9% and 17.1%, respectively. Moreover, the endothermic reaction temperature of SiC_f/SiC composites fabricated with Si-Hf alloy was about 26℃ as higher as that of raw Si-Hf alloy powder. Three-point bending strength and the fracture behavior at room temperature and 1200℃ were investigated. The SiC_f/SiC composite fabricated with Si-Hf alloy at 1375℃ showed higher bending strength than composite fabricated with conventional Si-MI at 1450℃.
