Effect of Enterfacial Treatment Process on the Microstructure and Properties of C_f/SiC Ceramic Matrix Composites

摘要

This paper investigated the CVSiC ceramic matrix composites. By utilizing different interfacial treatment processes to prepare carbon-fiber preform, the preform was then densified by infiltration and pyrolysis with polycarbosilan/xylene solution as precursor, and the Cf/SiC ceramic matrix composite specimens were fabricated. Mechanical tests such as bending test and fracture toughness were performed for Cf/SiC samples. The results show that the interfacial bonding strength in the sample with high-temperature treatment process was improved due to removing surface sizing. The samples which were treated up to 1400°C exhibited the highest three-point flexural strength, up to 595MPa;;The samples which were treated up to 1400°C and deposited by pyrolytic carbon coating shows the highest fracture toughness value which was 20.70 MPa?m~(1/2).