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中文摘要：
分别以MgO、Al2O3和B2O3为添加剂，利用包埋法在炭／炭（C／C）复合材料表面制取了单层SiC涂层，并在这三种SiC涂层表面采用相同包埋工艺得到SiC外涂层。研究了这三种氧化物对SiC涂层组织结构及抗氧化性能的影响。通过SEM、EDS和XRD分析表明，以MgO为添加剂得到的单层SiC涂层疏松且含有大量孔洞；以Al2O3为添加剂得到的涂层较为致密，但存在部分孔洞；以B2O3为添加剂时涂层均匀、致密。在1500℃空气介质中的氧化实验表明，以B2O3为添加剂的双层SiC涂层（-200μm）可有效保护C／C复合材料200h不被氧化。
英文摘要：
Double-layer SiC-based coatings on carbon/carbon composites were prepared by a wrapping cementation method with different oxides （MgO, Al2O3 or B2O3 ） as additives to the inner layer. The phase morphologies and antioxidation properties of the SiC coated carbon/carbon composites were investigated by SEM, EDS and XRD. Results show that the SiC coating with B2O3 as an additive to the inner layer is more compact than those with MgO or Al2O3 as the additive. Different phases exist in the three different inner layer SiC coatings. The double-layer SiC coating modified by B2O3 is dense and uniform with few flaws and holes, and can protect carbon/carbon composites from oxidation at 1500 ℃ for 200 h in air.
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