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AgAl2O3粉体复合材料形成过程分子动力学模拟

, PP. 150-155

Keywords: 分子动力学模拟,催化剂,Ag-Al2O3复合材料,扩散,Al2O3氧化膜

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Abstract:

采用分子动力学的方法研究了Al-Ag合金粉末在氧化气氛进行热处理的物相转变与扩散行为,着重对物相扩散速率、转变温度、Ag-Al2O3物相转变过程进行了研究。结果表明:O原子与Al原子的相互作用为Ag原子的扩散提供动力,Ag的析出与Al2O3致密氧化膜的形成相互冲突,在600K氧化气氛下合金粉末中Ag的析出速率大,内部形成Ag2Al相。实验结果验证了模型设计与计算结果的合理性,表明通过控制反应温度、Al2O3致密氧化膜的形成和Ag的短路径扩散能够控制Ag在纳米尺度内。

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