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ti3alc2的高温临氢行为

Keywords: 无机非金属材料,临氢,高温,tialc

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Abstract:

?研究了ti3alc2体材料在氢气氛中的高温(1100~1400℃)热稳定性。采用xrd、sem、sims和raman分析等手段对ti3alc2临氢反应前后的物相组成、表面形貌进行了表征;使用热力学软件factsage计算了反应过程中的气态产物。结果表明,在1100~1400℃氢气氛条件下有少量h溶解在ti3alc2材料中,ti3alc2发生了以al元素缺失为特征的有限程度的分解反应。缺失的al元素与气氛中极微量的氧反应形成了均匀但不致密的al2o3膜;而当反应温度为1400℃时,al2o3膜发生了明显的脱落。使用热力学软件的计算结果预测,部分缺失al元素与h2反应生成气体产物alh。初步的研究结果表明,在1300℃以下ti3alc2具有较好的耐氢性能。

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