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OALib Journal期刊
ISSN: 2333-9721
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反应合成ti--35\%al多孔合金的膨胀特性
Keywords: 金属材料,？,ti--al金属间化合物,多孔材料,反应合成,膨胀行为
Abstract:
？烧结膨胀特性是元素粉末反应合成ti--al合金多孔材料的重要特征,与其孔结构性能密切相关。本文在其它制备参数一定的条件下,从普通反应合成和约束烧结二个过程分别论述ti--al合金多孔材料的膨胀行为及其规律。结果表明:ti/al元素的溶解度和扩散速率的差异导致kirkendall孔隙的产生,引起了坯体体积的大幅度膨胀。在al的第一阶段偏扩散过程中,ti--al烧结坯发生了高达60\%以上的大幅度体积膨胀行为,同时坯体的开孔隙度接近40\%;在al的第二阶段偏扩散过程中,ti/al烧结坯的体积膨胀量为1\%--3\%,同时坯体的开孔隙度达到47%左右。而在约束烧结过程中,ti--al合金多孔材料的前期膨胀行为表现出严格的直线变化规律;在烧结后期,ti--al合金多孔材料表现出体积略为收缩的行为。
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