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Journal of Inorganic Materials

Journal of Inorganic Materials >

2008 , Vol. 23 >Issue 5: 996 - 1000

DOI: https://doi.org/10.3724/SP.J.1077.2008.00996

Research Paper

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

  • WANG Pei ,
  • LIN Li ,
  • ZHU Yue-Xiang ,
  • XIE You-Chang
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  • 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 date: 2007-10-16

  Revised date: 2008-03-03

  Online published: 2008-09-20

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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

Cite this article

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, 2008 , 23(5) : 996 -1000 . DOI: 10.3724/SP.J.1077.2008.00996

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