Mechanical Properties of C/SiC Composites via Precursor Pyrolysis with Pretreated Carbon Fiber
3D C/SiC composites were fabricated by polycarbosilane (PCS) infiltration and pyrolysis process. The influence of pretreatment of carbon fiber, including pyrolytic carbon coating and thermal treatment, on mechanical properties of C/SiC composites was investigated. The results showed that the composites without fiber pretreatment had a flexural strength of 154MPa and a fracture toughness of 4.8 MPa•m1/2, while those with carbon coating or thermal treatment had much higher strength and toughness, that is, more than 400MPa and 15MPa•m1/2 respectively. Weak interfacial bonding and better in-situ strength of carbon fiber were main reasons for mechanical property improvement with pretreated carbon fiber.
Wei Pan and Jianghong Gong
S. Wang et al., "Mechanical Properties of C/SiC Composites via Precursor Pyrolysis with Pretreated Carbon Fiber", Key Engineering Materials, Vols. 336-338, pp. 1245-1247, 2007