研究了疲劳氧化环境中3D SiCf/SiC复合材料损伤演变,并对该环境中SiCf/SiC复合材料的失效机制进行了分析.结果表明,疲劳氧化环境中3D SiCf/Sic复合材料的损伤主要为:基体开裂;热解碳界面相脱粘、氧化及取向性排列;纤维断裂、氧化及其结构的改变.这些损伤使氧化性气体通过基体开裂形成的裂纹不断氧化复合材料内部;界面相脱粘和取向性排列使纤维更容易拔出;纤维的氧化、纤维中无定形碳的增多以及SiC晶粒的长大导致纤维强度降低.
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