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中文摘要：
通过在不同条件下的氧化试验,结合SEM,研究了金属Si复合Al2O3-SiC材料的高温氧化行为。结果表明,金属Si优先SiC氧化有利于生成玻璃状薄膜,形成结构致密的保护层,保护了碳化硅不被氧化,同时使得内部金属Si保存下来;Si复合Al2O3-SiC材料的1350℃氧化过程包括前期化学反应控制和后期扩散控制两个阶段,扩散控制阶段反应符合Ginsterlinger扩散动力学关系。同Al2O3-SiC材料相比,Si复合Al2O3-SiC材料的氧化更早进入扩散控制反应阶段。
英文摘要：
The oxidation behavior of Al2O3-SiC composites containing Si was investigated by oxidation test at high temperature and SEM. The results show that preferential oxidation of Si metal can speed the formation of dense layer, which not only increases the oxidation-resistant performance of composites, but also makes Si metal exist in the composites at high temperature. The oxidation reaction process at 1300℃ is divided into two reaction kinetics stages, one of which is called the chemical reaction controlling stage at the beginning period, the other is the diffusion controlling stage. The latter is coincided with the Ginsterlinger＇s kinetic models of diffusion controlling type. And entering diffusion controlling stage for the oxidation reaction of Al2O3-SiC composites containing Si is earlier than that of Al2O3-SiC composites.
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