LI Libei¹, ZHANG Jinhua¹, LIU Xuexin², WANG Jingran¹, LI Wen¹, HAN Bingqiang¹

(1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China；2. Hubei Siman New Materials Co., Ltd., Huanggang 438400, China)

Abstract: α-Al₂O₃ powder was prepared by high temperature calcination using industrial alumina powder as raw material and H₃BO₃ as mineralizer. The influences of calcination temperature and H₃BO₃ dosage on the phase ratio of α-Al₂O₃, the corotent of impurity Na₂O and the grain size and morphology were studied.The results show that the increasing of H₃BO₃ dosage has little effect on the phase conversion of Al₂O₃. The addition of H₃BO₃ can accelerate the grain growth of α-Al₂O₃, reduce the content of β-Al₂O₃ and impurity Na₂O. With the increasing of calcination temperature, the particle size of α-Al₂O₃ increases gradually, the grain morphology is regular, the grain surface is smooth and the grain size is uniform, and the calcination temperature is the main factor affecting the phase ratio of Al₂O₃ and reducing the content of Na₂O.When the calcination temperature is 1 450 ℃ and the mass fraction of H₃BO₃ is 0.4%, the mass fraction of impurity Na₂O is 0.001%, the particle size of α-Al₂O₃ powder is 1～1.5 μm, and the grain morphology is the best.

Keywords: industrial alumina;calcination temperature; boric acid dosage; ratio of phase rotation

Received： 2022-06-14，Revised：2022-11-19，Online：2022-12-02 16:42。

Funding Project： 国家自然科学基金项目，编号：51802235；湖北省教育厅科研计划项目，编号：B2020019。

First Author： 李立倍(1996—)，女，硕士研究生，研究方向为硼化物陶瓷粉体的制备。E-mail： 1791315126@qq.com。

Corresponding Author： 张锦化(1981—)，男，副教授，博士，硕士生导师，研究方向为刚玉-尖晶石微纳米粉体、硼化物陶瓷纳米粉体的制备。E-mail： zhangjinhua@wust.edu.cn。