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炭/炭复合材料用SiC-Glass涂层的高温氧化机理

, PP. 113-118

Keywords: 炭/炭复合材料,抗氧化,涂层

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Abstract:

采用包埋法和预涂-烧结法相结合的组合工艺在炭/炭(C/C)复合材料表面制得SiC-Glass复合涂层,并借助X射线衍射仪(XRD)和扫描电镜(SEM)对该复合涂层进行了表征,研究了涂层C/C试样在不同温度下的氧化动力学规律。结果表明:复合涂层具有双层结构,包埋SiC内层由β-SiC相和少量游离硅相组成,外层由MoSi2颗粒掺杂的硼硅酸盐玻璃构成;内外层之间结合紧密;在1300~1600℃的空气气氛中,SiC-Glass涂层表现出良好的抗氧化性能,其氧化激活能为118.1kJ/mol,氧化主要受控于氧在Glass层中的体扩散速率;在1600℃空气气氛中氧化65h后,SiC-Glass涂层C/C试样的氧化失重率仅为1.02%。

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