Novel nonaqueous precipitation synthesis of alumina powders

被引：28

作者：

Feng, Guo ^{[1
]}

Jiang, Weihui ^{[1
,2
,3
]}

Liu, Jianmin ^{[1
]}

Li, Cong ^{[1
]}

Zhang, Quan ^{[1
]}

Miao, Lifeng ^{[1
]}

Wu, Qian ^{[1
]}

机构：

[1] Jingdezhen Ceram Inst, Natl Engn Res Ctr Domest & Bldg Ceram, Jingdezhen 333000, Peoples R China

[2] Jingdezhen Ceram Inst, Dept Mat Sci & Engn, Jingdezhen 333000, Peoples R China

[3] Jiangxi Key Lab Adv Mat, Jingdezhen 333000, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2017年 / 43卷 / 16期

基金：

中国国家自然科学基金;

关键词：

Alumina; Powder; Nonaqueous; Precipitation method; Crystal precipitate; METAL-OXIDE PARTICLES; SIZE; DEPOSITION;

D O I：

10.1016/j.ceramint.2017.07.050

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：

Alumina powders were prepared via a novel nonaqueous precipitation method with aluminum powders as aluminum source and anhydrous acetic acid as precipitant. The thermal decomposition and phase transformation of crystal precipitate and the influence of precipitate aging were investigated via TG-DTA-MS, XRD, TEM, BET, FE-SEM and performance tests of sintered bodies. The results show crystal precipitate C4H7AlO7 transforms to amorphous Al2O3 at 300 degrees C, and then to gamma-Al2O3 at 950 degrees C, and finally to alpha-Al2O3 at 1050 degrees C. The particle size of alpha-Al2O3 prepared at 1100 degrees C is 50-100 nm with BET surface area of 25.98 m(2).g(-1). FE-SEM morphology of sintered sample at 1400 degrees C shows excellent sinterability of the alpha-Al2O3 powders. Aging eliminates aggregation, and leads to highly homogenized and densified particles. It also affects the densification behaviour during sintering and further influences density, thermal expansion coefficient, flexural strength, volume resistivity and electric breakdown strength of sintered bodies

引用

页码：13461 / 13468

页数：8

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