Evidence of bilevel solubility in the bimodal microstructure of TiO2-doped alumina

被引：17

作者：

Chi, MF ^{[1
]}

Gu, H ^{[1
]}

Wang, X ^{[1
]}

Wang, PL ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 20050, Peoples R China

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2003年 / 86卷 / 11期

关键词：

D O I：

10.1111/j.1151-2916.2003.tb03587.x

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：

A phenomenon of bilevel solubility was observed in a TiO2-doped (2.0 wt%) alumina with bimodal microstructure sintered in N-2. Surface contributions to dopant signals in individual grains were identified and removed, using a spatially resolved energy dispersive spectroscopy analysis. Two levels of solubility, 1.005 +/- 0.166 and 0.504 +/- 0.082 mol% of TiO2 in Al2O3, were obtained for anisotropic and equiaxed grains, respectively. No grain size dependence of solubility was found, but segregation of SiO2 to boundaries with the anisotropic grains was observed. This phenomenon was explained by the incorporation of Ti3+ into the Al2O3 lattice during the abnormal grain growth caused by SiO2 liquid under a reducing atmosphere.

引用

页码：1953 / 1955

页数：3

共 24 条

[1] EFFECT OF TIO2 ON INITIAL SINTERING OF AL2O3 [J].