Preparation of High-Purity Ultrafine α-Al2O3 by Solid-State Reaction at Room Temperature

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Ammonium aluminium carbonate hydroxide (AACH), with a small quantity of γ-AlOOH, was synthesized through solid-state reaction at room temperature using AlCl3·6H2O and NH4HCO3 as raw materials and polyethylene glycol (PEG-10000) as the dispersant. After calcined at 1100°C for 1.5h, α-Al2O3 powders with primary particle sizes of 20~30nm were obtained. The crystal phase, particle size and morphology of the high-purity ultrafine α-Al2O3 were characterized. The results showed that a small quantity of γ-AlOOH in the AACH decomposed and formed crystal seeds. The presence of crystal seeds reduced the nucleation activation energy and therefore reduced the phase transformation temperature.

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Periodical:

Key Engineering Materials (Volumes 368-372)

Edited by:

Wei Pan and Jianghong Gong

Pages:

683-685

Citation:

C. W. Hao et al., "Preparation of High-Purity Ultrafine α-Al2O3 by Solid-State Reaction at Room Temperature", Key Engineering Materials, Vols. 368-372, pp. 683-685, 2008

Online since:

February 2008

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$38.00

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