Characterization of Fiber-Reinforced SiC Composites by Precursor-Pyrolysis and Hot-Pressing

Abstract:

CF/SiC and Hi-Nicalon/SiC composites were prepared by precursor pyrolysis-hot pressing, and the microstructure and fracture behavior of the composites were investigated. Because of a strongly bonded fiber/matrix interface primarily resulting from the direct reactions between the fibers and matrix, Hi-Nicalon/SiC composite exhibited a typical brittle fracture behavior. However, CF/SiC composite displayed a tough fracture behavior with extensive fiber pullout, which was primarily attributed to a weakly bonded fiber/matrix interface as well as higher strength retention of the fibers. As a result, CF/SiC composite achieved better mechanical properties of 691.6 MPa in strength and 20.7 MPa•m1/2 in toughness, which were much higher than those of Hi-Nicalon/SiC composite.

• Periodical: Key Engineering Materials (Volumes 280-283)
• Pages: 1305-1308
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.280-283.1305
• Online since: February 2007
• Authors: Xin Bo He, Xuan Hui Qu, Chang Rui Zhang, Xin Gui Zhou
• Keywords: Fiber, Fracture Behaviour, SiC-Based Composites

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