（Xi an Aerospace Composites Material Institute, Xi an 710025,China）
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DOI:
10.7502/j.issn.1674-3962.2013.04.07
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Abstract:
Composites with silicone carbide matrix and coatings have been widely used in aerospace field, due to fheir high properties of being resistant to oxidation, high temperature resisting, wearresisting, corrosionresisting and thermal endurant. As a kind of polymer precursor, polycarbosilane can be used to prepare silicone carbide coatings and silicone carbide matrix via polymer pyrolysis in circumstances of high temperature. Synthesizing methods, structures and properties of polycarbosilane are summarized in this article. Applications of silicone carbide fibers, surface/interface coatings of silicone carbide for resisting oxidation, silicone carbide matrix composites original from polycarbosilane are meanwhile included.Oxidation and ablation resisting properties of C/C composites clad with SiC coating are raised, service life are extended. Flexural strength and fracture toughness of C/SiC composite fabricated by CVI+PIP process are attained to be 643 MPa and 2094 MPa·m 1/2 respectively.