SiC/SiC复合材料氧化退化研究进展

从SiC/SiC复合材料氧化行为、氧化环境下的失效机理与力学性能三个方面,对SiC/SiC复合材料氧化退化的研究进展进行了综述。文中总结了影响材料氧化行为的重要因素,包括温度、氧分压、水蒸汽以及界面层厚度等。详细分析了材料在不同温度范围内的失效机制,即氧化脆化是SiC/SiC复合材料在中温范围内的重要失效机制,材料在高温下的失效主要是由纤维强度退化、蠕变及界面氧化引起的。总结出:界面氧化消耗、纤维性能退化是引起材料力学性能退化的关键因素,指出了目前研究中存在的问题和发展方向。

Research Progress of Oxidation Degradation of SiC/SiC Composites

In this paper, the research progress of oxidation degradation of SiC/SiC composites was reviewed from three aspects: oxidation behavior, failure mechanism and mechanical properties of SiC/SiC composites under oxidizing atmosphere. Firstly, the critical fac-tors that affect the oxidation behavior of materials were summarized includingtempera-ture, oxygen partial pressure, water vapor and the thickness of the interface layer et.al. Secondly, the failure mechanism of the composites in different temperature ranges was analyzed in detail. Oxidative embrittlement is a crucial failure mechanism of SiC/SiC composites in the medium temperature range. While the failure of the composites at high temperatures is mainly caused by fiber strength degradation, fiber creep and inter-face oxidation. Then, it was concluded that interface oxidation consumption and fiber performance degradation are the key factors that cause the degradation of the mechani-cal properties of the composites. Finally, the existing problems and research directions were pointed out.