【摘要】 制备了 Si C短纤维增强原位合成的 Si C- BN复合陶瓷 (Si Csf/ Si C- BN) ,对其氧化动力学进行了分析计算 ,并对不同成分的 Si Csf/ Si C- BN复合陶瓷在 80 0～ 12 0 0℃的氧化过程进行了研究。研究表明 ,Si3N4 ,B4 C和 C可以原位合成复合陶瓷的基体。复合陶瓷在高温发生氧化时 ,Si C和 BN氧化产物主要为 Si O2 和 B2 O3,这两者互融形成的薄膜可以有效减缓复合陶瓷的氧化更多还原

【Abstract】 SiC-BN composites, reinforced by SiC short fibers, were fabricated via in-situ synthetic reaction （SiC sf /SiC-BN）. These oxidation kinetics were analyzed and calculated from 800℃ to 1200℃. Oxidation resistance of SiC sf /SiC-BN composites had been analyzed from 800℃ to 1200℃. The results show that the in situ synthesis, which used Si₃N4, B₄C and carbon as reactants, could take place to form the matrix of composites. SiC and BN are oxidized to form SiO₂ and B₂O₃ at high temperature. The SiO₂ and B₂O₃ react to form stable borosilicates glass which can decrease rate of oxidation.更多还原