Anti-oxidation mechanisms of the SiC/ZrB2-MoSi2 coating on the carbon/carbon composites
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摘要: 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。
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关键词:
- C/C 复合材料 /
- 刷涂法 /
- SiC/ZrB2-MoSi2涂层 /
- 抗氧化
Abstract: The anti-oxidation coatings of SiC/ZrB2-MoSi2 on the carbon/ carbon composites were prepared by pack cementation and slurry painting. The coating microstructure, performance and the anti-oxidation mechanisms were investigated by SEM, XRD, etc. The results show that the inner coating of SiC can eliminate the thermal expansion mismatch between carbon/carbon composites and the outer coating of ZrB2-MoSi2. The coating mass loss of ZrB2-MoSi2 prepared by slurry painting with a lot of craze cracks is 3.58 % after 10 h in air at 1500 ℃. The coating exhibits self-healing performance, excellent anti-oxidation ability and thermal shock resistance.-
Key words:
- C/ C composite /
- slurry painting /
- SiC/ZrB2-MoSi2coating /
- anti-oxidation
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