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

Abstract:

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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.

Info:

Periodical:

Key Engineering Materials (Volumes 280-283)

Edited by:

Wei Pan, Jianghong Gong, Chang-Chun Ge and Jing-Feng Li

Pages:

1305-1308

DOI:

10.4028/www.scientific.net/KEM.280-283.1305

Citation:

X. B. He et al., "Characterization of Fiber-Reinforced SiC Composites by Precursor-Pyrolysis and Hot-Pressing", Key Engineering Materials, Vols. 280-283, pp. 1305-1308, 2005

Online since:

February 2007

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Price:

$35.00

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