在氧气中焙烧C/γ-Al2O3复合物快速制备α-Al2O3微粉

doi:10.3724/SP.J.1077.2008.00996

无机材料学报

在氧气中焙烧C/γ-Al₂O₃复合物快速制备α-Al₂O₃微粉

王培^1,2, 林莉¹, 朱月香¹, 谢有畅¹

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 出版日期:2008-09-20 网络出版日期:2008-09-20

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

摘要/Abstract

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

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

中图分类号:

TB35

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, DOI: 10.3724/SP.J.1077.2008.00996.

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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在氧气中焙烧C/γ-Al₂O₃复合物快速制备α-Al₂O₃微粉

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

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