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埋碳条件下氮化硅铁-刚玉复合材料的反应机理

DOI: 10.7521/j.issn.0454-5648.2014.09.17

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Abstract:

以热固型酚醛树脂为结合剂,在刚玉中分别引入质量分数为0、5%、10%、15%、20%、25%的氮化硅铁,制备出氮化硅铁-刚玉复合材料。结果表明样品在埋碳气氛下于1450℃保温24h处理后,常温耐压强度增加;添加氮化硅铁质量分数为15%的样品,耐压强度达到132MPa。氮化硅铁中部分Fe3Si转化成为Fe4N;热固酚醛树脂结合剂中部分残碳与氮气反应生成C3N4;氮化硅与刚玉发生固溶,生成Si5AlON7(Z=1)。氮化硅铁中的氮化硅与刚玉固溶形成Sialon。新形成的物相(Fe4N、C3N4和Si5AlON7)改善了样品的性能。

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