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

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

研究论文

在氧气中焙烧C/γ-Al2O3复合物快速制备α-Al2O3微粉

  • 王 培 ,
  • 林 莉 ,
  • 朱月香 ,
  • 谢有畅
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  • 1. 北京分子科学国家实验室, 分子动态与稳态结构国家重点实验室, 北京大学化学与分子工程学院, 北京 100871; 2. 中国工程物理研究院化工材料研究所, 绵阳 621900

收稿日期: 2007-10-16

  修回日期: 2008-03-03

  网络出版日期: 2008-09-20

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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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摘要

提出了一种快速制备α-Al2O3微粉的方法, 以淀粉为碳源、γ-Al2O3为前体制备了C/γ-Al2O3复合物, 然后在800℃、氧气氛中焙烧制备α-Al2O3微粉. N2物理吸附及SEM分析结果表明, 所制得的α-氧化铝颗粒细小, 约为2μm. 该方法具有焙烧温度低、焙烧时间短的优点, 同时, 淀粉及γ-Al2O3均为廉价的工业原料, 且该方法所需淀粉量较少, 最少仅需0.3g/g γ-Al2O3, 对应的C/γ-Al2O3复合物碳含量约为6wt%, 因而极具工业化应用前景.

关键词： 超细α-Al2O3粉; 淀粉; C/γ-Al2O3复合物

本文引用格式

王 培 , 林 莉 , 朱月香 , 谢有畅 . 在氧气中焙烧C/γ-Al2O3复合物快速制备α-Al2O3微粉[J]. 无机材料学报, 2008 , 23(5) : 996 -1000 . DOI: 10.3724/SP.J.1077.2008.00996

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

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