Preparation of Nanoscale High-Purity α-Alumina Powders

Abstract:

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High-purity nanoscale α-alumina powders with high specific surface area were prepared from boehmite powders synthesized by the method of aluminium isopropoxide hydrolysis. The physiochemical transformation of boehmite powders under heat-treatment was investigated. The results showed that the reaction progress of boehmite under heat-treatment is as follows: AlO(OH) → Al2O3 (amorphous) → γ-Al2O3 → δ-Al2O3 → α-Al2O3. The phase transformation from δ-Al2O3 to α-Al2O3 begins at 1050oC, and the α-Al2O3 grains growth accelerates as temperature increases. High-purity α-Al2O3 nanometer powders with higher specific surface area can be obtained after incineration at 1100oC for 4 h.

Info:

Periodical:

Key Engineering Materials (Volumes 336-338)

Edited by:

Wei Pan and Jianghong Gong

Pages:

2051-2053

DOI:

10.4028/www.scientific.net/KEM.336-338.2051

Citation:

X. L. Wu et al., "Preparation of Nanoscale High-Purity α-Alumina Powders", Key Engineering Materials, Vols. 336-338, pp. 2051-2053, 2007

Online since:

April 2007

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Price:

$35.00

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