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C/SiC表面SiC涂层氧化的显微CT无损检测与分析

, PP. 126-132

Keywords: C/SiC复合材料,SiC涂层,显微CT,干氧,湿氧

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Abstract:

对C/SiC复合材料表面SiC涂层在1300℃干氧和湿氧环境中退火处理60h,利用显微CT技术对高温氧化后的SiC涂层进行无损检测。通过重构SiC涂层不同深度的氧化形貌,并利用SEM、EDS和XRD进行辅助验证,得到沿SiC涂层表面和厚度方向的氧化形貌。结果表明:显微CT能有效地检测氧化后SiC涂层中存在的氧化产物SiO2及其氧化深度,其在表面及深度方向均呈非均匀分布;在干氧环境中SiC涂层的氧化面积沿着涂层的深度方向呈减少趋势,而在湿氧环境中SiC涂层的氧化面积沿着涂层的深度方向呈先增加后递减的趋势,验证了C/SiC复合材料表面SiC涂层在干氧和湿氧中不同的氧化机制。

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