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中文摘要：
利用介质阻挡放电等离子体辅助球磨和普通球磨分别对Al2O3＋C混合物料进行活化,研究等离子体辅助球磨活化后Al2O3＋C合成AlN 的碳热还原反应机制. 结果表明,等离子体辅助球磨30h 的Al2O3＋C,在N2气氛中1400℃下保温4h,Al2O3即可全部转化为AlN,Al2O3＋C 的碳热还原反应符合固-固反应机制.相对于球磨活化单一的Al2O3粉末,等离子体辅助球磨Al2O3＋C混合粉末可以缩短10h的球磨活化时间,这主要是由于在等离子体与球磨的协同作用下,有利于Al2O3与C形成适于固-固反应的均匀互溶的精细复合结构,使得反应扩散通道增加,平均扩散路径缩短,这在动力学方面大大促进了Al2O3＋C的碳热还原反应,并促使反应按照固-固机制进行.
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