Formation of α-alumina around 500°C in alkoxy-derived alumina gels under ambient pressure -: Effects of starting solution composition and seeding

被引：18

作者：

Kamiya, K ^{[1
]}

Hioki, N ^{[1
]}

Hashimoto, T ^{[1
]}

Nasu, H ^{[1
]}

机构：

[1] Mie Univ, Fac Engn, Dept Chem Mat, Tsu, Mie 5148507, Japan

来源：

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 2001年 / 20卷 / 03期

关键词：

sol-gel method; aluminum-sec-butoxide; alpha-alumina; low temperature formation; seeding;

D O I：

10.1023/A:1008778103062

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：

The hydrolysis of aluminum-sec-butoxide (ASB) in the ASB-H2O-C2H5OH-HCl solutions at 0 degreesC for 18 h and subsequent aging of the sol for 30 days at 5 degreesC provided an alumina gel which was partially (20-30 wt%) transformed to alpha -Al2O3 when heat-treated at 500 degrees -600 degreesC under ambient pressure. In addition to the hydrolysis and aging conditions, the amounts of water and HCl in the starting solution were found to be very important factors for the low temperature formation of alpha -Al2O3 in the resultant gel. Some difference in the chemical environment of involved OH groups was found between the alumina gel forming alpha -Al2O3 at 500 degrees -600 degreesC and the conventional gel. Corundum seeding was found to be effective; thus, 1 wt% seeding brought about an increase in the fraction of alpha -Al2O3 formed at 600 degreesC to 40-50 wt%.

引用

页码：275 / 285

页数：11