α-Al2O3相变机理及制备工艺研究进展

α-Al₂O₃在耐火材料、电子材料等多个领域有着极其重要的应用。本文首先介绍了α-Al₂O₃在工业应用方面的评价指标和α-Al₂O₃的相变机理,接着分别从固相合成、液相合成、气相合成三个方面阐述了α-Al₂O₃制备的相关研究进展,对制备过程中影响α-Al₂O₃晶粒微观状态的若干因素,包括煅烧温度、矿化剂类型、pH值及预处理条件等进行讨论。最后指出了当前对α-A1₂O₃成核生长机理研究缺乏的问题,表明明确的成核机理、高纯度α-A1₂O₃的量产和形貌控制技术将会是该领域未来的研究重点和发展方向。

Research Progress on Phase Transition Mechanism and Preparation Technology of α-Al2O3

α-Al₂O₃ has important applications in refractories, electronic materials and many other fields. This article first introduces the evaluation index of α-Al₂O₃ in industrial application and α-Al₂O₃ phase transition mechanism. Then the article expounds related research progress of the α-Al₂O₃ preparation, from three aspects that solid phase synthesis, liquid phase synthesis and gas phase synthesis, respectively. The factors which affect the microstructure of α-Al₂O₃ particles during preparation are discussed, including calcination temperature, mineralizer, pH value and pretreatment conditions. Finally, the lack of research on the nucleation growth mechanism of α-Al₂O₃ is pointed out, and indicating that a specific nucleation mechanism, the mass production of high purity α-Al₂O₃ and morphology control technology will be the future research focus and development direction in this field.