Thermal stability of transition phases in zirconia-doped alumina

被引：57

作者：

Djuricic, B ^{[1
]}

Pickering, S ^{[1
]}

Glaude, P ^{[1
]}

McGarry, D ^{[1
]}

Tambuyser, P ^{[1
]}

机构：

[1] JOINT RES CTR,INST ADV MAT,NL-1755 ZG PETTEN,NETHERLANDS

来源：

JOURNAL OF MATERIALS SCIENCE | 1997年 / 32卷 / 03期

关键词：

D O I：

10.1023/A:1018567230733

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Alumina was prepared from an aqueous salt solution by homogeneous precipitation followed by calcination in air. Dependence of the thermal stability of transition phases on the presence of a zirconia dopant and on autoclave treatment prior to calcination was investigated using X-ray diffraction (XRD), differential thermal analysis coupled with thermogravimetric analysis (DTA-TGA) and transmission electron microscope (TEM) analysis. Homogeneous precipitation produced an amorphous trihydrate precipitate; the autoclave treatment converted this to crystalline boehmite (monohydrate). The zirconia was soluble in the transition alumina but was insoluble in alpha-Al2O3 so that phase transformation to alpha-Al2O3 was accompanied by a phase separation to form an alumina-zirconia nanocomposite. The thermal stability of the transition phases was increased both by the dopant and by the autoclave treatment. A combination of both parameters yielded the most stable transition alumina, which withstood 1 h at 1200 degrees C without transformation to alpha-Al2O3.

引用

页码：589 / 601

页数：13