采用包埋技术在C/C复合材料表面制备SiC-WSi2/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W、Mo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: 随着包埋粉料中W、Mo含量的增加, 所制备复合涂层的厚度先增加后减小; 含有10.0at％ W和Mo制备的复合涂层具有相对较大的厚度和较为致密的结构, 且WSi2和MoSi2含量相对较高; 氧化过程中在涂层表面形成致密和稳定的SiO2玻璃保护膜; 在1500℃氧化315h后, 带有该涂层的C/C试样仍然没有失重, 且经过18次1500℃←→室温急冷急热后涂层没有开裂和脱落, 说明该涂层具有优异的抗氧化和抗热震性能.
A SiC-WSi2/MoSi2 multilayer oxidation protective coating for carbon/carbon (C/C) composites was prepared by pack cementation. Effects of the total content of W and Mo 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 with the total content of W and Mo increasing in the pack powders, the as-received multi-coating thickness first increases and then decreases. The multi-coating with 10.0at％ (W and Mo) has a thicker, denser structure and higher content of WSi2 and
MoSi2 than those with 0at％, 8.4at％ and 13.1at％ (W and Mo). A stable and dense glassy SiO2 film can be formed on the coating surface with 10.0at％
(W and Mo) during the oxidation test. The coated specimen with 10.0at％ (W and Mo) has no weight loss after oxidation in air for 315h at 1500℃ and no cracks after thermal cycling between 1500℃ and room temperature for 18 times, which implies that the multicoating has excellent oxidation protective ability and thermal shock resistance.
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