Low temperature synthesis of ultrafine α-Al2O3 powder by a simple aqueous sol-gel process

被引：215

作者：

Li, Jiang ^{[1
]}

Pan, Yubai

Xiang, Changshu

Ge, Qiming

Guo, Jingkun

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2006年 / 32卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Al2O3; powder preparation; aqueous sol-gel process;

D O I：

10.1016/j.ceramint.2005.04.015

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Ultratine alpha-Al2O3 was synthesized by a simple aqueous sol-gel method using a citrate polymeric precursor derived from aluminum nitrate and citric acid mixed solution. The thermal decomposition of the precursor and subsequent formation of alpha-Al2O3 was investigated by X-ray diffractometer (XRD), field emission transmission electron microscope (FETEM), thermogravimetry-differential scanning calorimetry (TG-DSC)-mass spectra (MS) and Fourier transform infrared spectra (FTIR). The molar ratio of citric acid to metal nitrate (UN), which played an important role in phase transition and morphology controlling of alumina, was also investigated. A single-phase alpha-Al2O3 powder resulted after heat treatment at similar to 1000 degrees C. The increasing molar ratio of C/N was found to be in favor of gamma- to alpha-Al2O3 phase transition, whereas the precursor with C/N = 1 yielded a relatively well dispersed ultrafine alpha-Al2O3 powder with particle size of similar to 200 nm. (c) 2005 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：587 / 591

页数：5

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