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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。
Through the oxidation test under different conditions, combined with SEM, the oxidation behavior of the metal Si composite Al2O3-SiC was investigated. The results show that the preferential SiC oxidation of metal Si is conducive to the formation of a glassy film and the formation of a dense protective layer that protects the silicon carbide from oxidation while preserving the internal metallic Si. The 1350 ° C oxidation of Si composite Al2O3-SiC includes Pre-chemical reaction control and post-diffusion control two stages, diffusion control phase reaction in line with Ginsterlinger diffusion dynamics. Compared with Al2O3-SiC material, the oxidation of Si-composite Al2O3-SiC material earlier into the diffusion control reaction stage.