采用包埋技术在C/C复合材料表面制备SiC-TaSi2/MoSi2抗氧化复合涂层，通过恒温氧化实验以及X射线衍射分析、扫描电镜观察及能谱分析，研究了包埋粉料中钽钼含量对复合涂层微观结构和高温抗氧化性能的影响。结果表明，钽钼摩尔比为1:1所制备的复合涂层具有相对较大的厚度和较为致密的结构，氧化过程中在该涂层表面形成致密和稳定的玻璃态SiO2保护膜，在1500℃氧化326h和经过23次1500℃↔室温急冷急热后，带有该涂层的C/C试样失重仅为0.97%，说明该涂层具有优异的抗氧化和抗热震性能。
A SiC-TaSi2/MoSi2 multilayer oxidation protective coating for carbon/carbon (C/C) composites was prepared by pack cementation. Effects of the content of Ta and Mo in the second-step pack powders on the microstructure and high temperature anti-oxidation property of the multi-coating were studied by XRD, SEM, EDS and isothermal oxidation test. The results show that the multi-coating prepared at the mol ratio of 1:1 of Ta and Mo has a thicker, denser structure than those at the mol ratios of 0:1, 1:3, 3:1 and 1:0, on which the stable and dense glassy SiO2 film could be formed during oxidation test. After 326h oxidation in air at 1500℃ and thermal cycling between 1500℃ and room temperature for 23 times, the weight loss of the coated specimen was only 0.97%, implying that the multi-coating prepared at the mol ratio of 1:1 of Ta and Mo has excellent oxidation protective ability and thermal shock resistance.
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