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中文摘要：
采用化学气相沉积法（CVD）制备单质B和BC。分别对SiC涂层进行改性，在二维碳纤维增强碳化硅（2DC／SiC）复合材料表面制备SiC／B／SiC和SiC／BCx／SiC两种多层自愈合涂层，并利用扫描电镜对多层涂层表面和断面进行显微分析．700℃静态空气条件下氧化结果表明：CVD—B和CVD—BCx改性层氧化后生成的B2O3玻璃相可以较好地封填涂层微裂纹，氧化动力学受氧通过微裂纹和B2O3玻璃层的扩散共同控制；SiC／BCx／SiC-C／SiC复合材料氧化过程中氧化失重率更小，氧化10h后的强度保持率更高．
英文摘要：
Modification of SiC coating was carried out with B and BCx prepared by chemical vapor deposition（CVD）, SiC/B/SiC and SiC/BCx/SiC multi-layer self-healing coatings were prepared on a two-dimensional C/SiC composite. The surface and cross section morphologies of the multi-layer coatings were analyzed by SEM. Oxidation were carried out in static air at 700℃. The results show that the B2O3 glass produced by oxidation of B or BCx can seal the cracks existed in the coating well, the kinetics of oxidation is controlled by diffusion of oxygen through the micro-cracks and B2O3 glass layer; SiC/BCx/SiC-C/SiC composites have lower weight loss during the oxidation and higher strength retention after oxidized for 10h.
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