Fabrication of Cf/SiC-BN composites using polycarbosilane(PCS)- boron-SiC for matrix derivation

Cf/SiC-BN composite was fabricated via in situ reaction by applying boron as active filler. The influence of pyrolysis temperatures on ceramic yields and linear shrinkages were studied. At 1200°C B4C was synthesized and above 1300°C h-BN appeared as a result of the reaction between boron and N 2. There are some fiber pull-outs in both Cf/SiC composite and Cf/SiC-BN composite on the fracture surface, otherwise, the layered structure of h-BN can be observed on the fracture surface of C f/SiC-BN composite.