Mechanical properties of the SiCf/SiC composites reinforced with KD-I and KD-II fibers fabricated assisted by a microwave heating method

摘要

SiCf/SiC composites using KD-I and KD-II SiC fibers braided preforms as the reinforcements were fabricated by applying the polymer impregnation and pyrolysis (PIP) technique with a microwave heating assistance. The microwave heating temperature was 1100 degrees C, 1200 degrees C, 1300 degrees C, and 1400 degrees C, respectively. Microstructures, flexure properties, and fracture behaviors of the composites were investigated. The KD-II-SiCf/SiC composites exhibited higher flexure properties and improved non-brittle fracture characteristics than those of the KD-I-SiCf/SiC composites. The differences in the flexural properties, fracture behaviors and microstructures between the KD-I- and KD-II-SiCf/SiC composites were discussed based on the tensile properties of the SiC filaments and the interfacial bonding statues in the composites.