Preparation of Fine γ-Al2O3 Powders by Calcining Carbon-covered α-Al2O3 in Oxygen

doi:10.3724/SP.J.1077.2008.00996

Journal of Inorganic Materials

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Preparation of Fine γ-Al₂O₃ Powders by Calcining Carbon-covered α-Al₂O₃ in Oxygen

WANG Pei^1,2, LIN Li¹, ZHU Yue-Xiang¹, XIE You-Chang¹

1. Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China; 2. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China

Received:2007-10-16 Revised:2008-03-03 Published:2008-09-20 Online:2008-09-20

Abstract

Abstract: A new method for the preparation of fine α-Al₂O₃ powders was reported. C/γ-Al₂O₃ composites were prepared by carbonizing starch/γ-Al₂O₃ precursors. Calcining the composites under oxygen flow in a furnace at 800℃, rapid and total transformation of γ-Al₂O₃ to α-Al₂O₃ occurred when the carbon content was between 6wt%-13wt%. Characterized by N-₂ adsorption technique and SEM observation, the particle size of the as-prepared α-Al₂O₃ powders is about 2μm. By this method, γ-Al₂O₃ can be transformed in very short time of about several minutes to α-Al₂O₃ at 800℃, which is much lower than the temperature for the commercial preparation. The method is very efficient for the rapid preparation of fine α-Al₂O₃ powders. And the simple operation and cheap raw materials for the method show that it is very promising for industrial applications.

Key words: fine α-Al₂O₃ powders, starch, C/γ-Al₂O₃ composite

CLC Number:

TB35

WANG Pei,LIN Li,ZHU Yue-Xiang,XIE You-Chang. Preparation of Fine γ-Al₂O₃ Powders by Calcining Carbon-covered α-Al₂O₃ in Oxygen[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00996.

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Preparation of Fine γ-Al₂O₃ Powders by Calcining Carbon-covered α-Al₂O₃ in Oxygen

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