Abstract
Abstract 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 °C, 1200 °C, 1300 °C, and 1400 °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.
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