Fabrication of Cf/SiC Ceramic Matrix Composites by Polymer Precursor Pyrolysis

摘要

In this paper, continuous carbon fiber reinforced silicon carbide ceramic matrix composites were fabricated through polymer precursor pyrolysis methods, using PAN M40JB carbon fiber as reinforcement and polycarbosilane as precursor. The relationships of the number of infiltration-pyrolysis on the composites bulk density, bending strength (three-point), fracture toughness (SENB) and the interfacial shear strength were systematic studied. The processing condition such as molding pressure and the number of infiltration-pyrolysis cycles were determined and optimized. The fracture surface were characteristic by Scanning electron microscopy (SEM) at the same time. The results showed that with the number of infiltration-pyrolysis increased the amount of fiber pull-out decreased, the bulk density, fracture toughness and interfacial shear strength increased but the bending strength increased then decreased. The molding pressure 15MPa was suitable.