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采用包埋法和刷涂法在C/C复合材料基体上制备SiC/ZrB2-MoSi2抗氧化涂层,并利用SEM和XRD等测试手段对抗氧化涂层的组织结构、抗氧化性能和抗氧化机制进行了研究。研究结果表明,SiC内涂层可有效解决外涂层ZrB2-MoSi2与C/C复合材料基体间热膨胀系数差异较大的难题。刷涂法制备的ZrB2-MoSi2外涂层虽然有大量的龟裂纹,但涂层试样在1500℃空气中氧化10 h,失重率仅为3.58%,涂层具有很好的自愈合能力,表现出优异的高温抗氧化性能和抗热震性能。
The SiC / ZrB2-MoSi2 coatings were prepared by embedding and brushing on the C / C composites. The microstructure, oxidation resistance and oxidation resistance of the coatings were studied by SEM and XRD. Were studied. The results show that the SiC inner coating can effectively solve the problem of large difference in thermal expansion coefficient between the outer ZrB2-MoSi2 and C / C composites. Although there are a large number of cracks in the ZrB2-MoSi2 coating, the coating sample is oxidized in the air at 1500 ℃ for 10 h, the weight loss rate is only 3.58%, and the coating has good self-healing ability , Showing excellent high temperature oxidation resistance and thermal shock resistance.