水解法制备高纯α-Al2O3粉体的研究概况

Research Progress of Preparation α-Al2O3 Particles with High Purity through a Hydrolysis Method

由于具有优异的电学、光学、化学、力学等性能,高纯α-Al2O3粉体在新兴产业中具有举足轻重的作用。而通过铝粉和水之间的水解反应和焙烧工艺制备的α-Al2O3粉体虽然因其能耗低、环境污染小、纯度高等特点达到了产业化应用需求,但是如何实现所制备的α-Al2O3粉体结构、形貌和分散性可控是目前阻碍该种α-Al2O3粉体直接应用与高新技术领域的关键问题之一。本论文结合目前水解法制备高纯α-Al2O3粉体中存在的问题,首先通过改进的水解法和水热处理水解产物的方法制备了高纯γ-Al(OH)3和γ-AlOOH前驱体,继而通过优化焙烧工艺制备出了形貌和结构可控的α-Al2O3粉体。

Due to its excellent electronica,optical,chemical,mechanical properties,α-Al2O3 powder with high purity plays an important role in different fields.Although the α-Al2O3 powder prepared by the hydrolysis method between Al metal and water meets the purity demand in industrial application,others factors such as structure,morphology dispersibility controlling determines whether it can be used in Hi-tech field or not.Here,in this paper firstly devoted to preparing high purity γ-Al(OH)3 and γ-AlOOH precursors via a modified hydrolysis and hydrothermally treating the hydrolysis products methods.Then α-Al2O3 particles can be successfully prepared by the phase transformation of γ-Al(OH)3 and γ-AlOOH precursors through calcination.