Effect of milling treatment and additives on the morphology evolution of α-alumina from a commercial boehmite precursor
Author:
Liu Luoqiang1, Zhang Liang1, Zhu Lingling12, Zhang Xing1, Gao Zexu1, Li Hongxia2
Affiliation:
1. School of Materials Science and Engineering , Zhengzhou University , Zhengzhou , Henan 450001, P. R. China 2. State Key Laboratory of Advanced Refractories , Sinosteel Luoyang Institute of Refractories Research Co., Ltd. , Luoyang , Henan 471039, P. R. China
Abstract
Abstract
Because calcined alpha alumina (α-Al2O3) inherits the morphology characteristic of milled precursors, it is expected that the α-Al2O3 morphology could be improved by controlling the precursor morphology through the use of different milling processes. The microstructure evolution of the boehmite precursor under different milling treatments (planetary ball milling [PBM] and high-energy ball milling [HEBM]) and its influence on the microstructure of as-synthesized α-Al2O3 were investigated. The experimental results indicate that HEBM has a stronger modification effect in crystallinity, particle size and dispersibility of the boehmite precursor than PBM, which is of great importance to inhibit the formation of the typical worm-like structure of α-Al2O3. The microstructure of α-Al2O3 was further improved by the introduction of NH4BF4, NH4F and NH4Cl as additives. In particular, polygon-like α-Al2O3 particles with a size of 0.5 μm and a good dispersibility were prepared by calcination of the precursor with 30 h of HEBM and 20 wt.% NH4BF4.
Publisher
Walter de Gruyter GmbH
Subject
General Chemistry
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