采用化学气相沉积法(CVD)和刷涂法在C/SiC复合材料表面制备抗氧化涂层.该涂层由致密的CVD SiC层和多孔的Mo-Si层交替组成,其结构从里到外为:CVD SiC层→Mo-Si层→CVD SiC层→Mo-Si层→CVD SiC层.涂层试样于1400℃的氧化实验和1400℃<=>100℃的热震实验结果表明:在氧化和热震过程中,涂层均保持完整,没有出现脱落和掉块等失效现象.经1400℃、150h氧化后,涂层试样的失重率仅为0.25%,失重速率为6.61×10-6g·cm-2·h-1.在热震过程中,涂层试样基本保持氧化增重.经25次和50次热震后,涂层试样的弯曲强度保持率分别为95.73%和81.61%.SiC/Mo-Si复合涂层具有优异的抗氧化和抗热震性能,可对C/SiC复合材料提供1400℃、长时间的氧化防护.
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