摘要
碳化硅(SiC)陶瓷涂层和碳化硅(SiC)基陶瓷复合材料具有抗氧化、耐高温、耐磨、耐腐蚀等优异的综合性能,已在宇航领域得到广泛应用。聚合物先驱体——聚碳硅烷经高温裂解可制备碳化硅陶瓷涂层或碳化硅基体。综述了聚碳硅烷的合成、结构与性能以及其用于制备SiC纤维、SiC表面/界面抗氧化涂层和SiC基陶瓷复合材料的情况。对C/C材料进行SiC涂层,提高了复合材料的抗氧化烧蚀性能,延长了C/C材料的使用寿命。采用"CVI+PIP"工艺研制的C/SiC复合材料弯曲强度高达643 MPa,断裂韧性高达20.94 MPa·m1/2。
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, wear-resisting, corrosion-resisting 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 sili- cone carbide for resisting oxidation, silicone carbide matrix composites original from polycarbosilane are meanwhile includ- ed. Oxidation and ablation resisting properties of C/C composites clad with SiC coating are raised, service life are extend- ed. Flexural strength and fracture toughness of C/SiC composite fabricated by CVI ＋ PIP process are attained to be 643 MPa and 20.94 MPa·m^1/2 respectively.
出处
《中国材料进展》
CAS
CSCD
2013年第4期243-248,共6页
Materials China
