Thermal stability of transition phases in zirconia-doped alumina

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)...

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Published inJournal of materials science Vol. 32; no. 3; pp. 589 - 601
Main Authors DJURICIC, B, PICKERING, S, GLAUDE, P, MCGARRY, D, TAMBUYSER, P
Format Journal Article
LanguageEnglish
Published Heidelberg Springer 01.02.1997
Springer Nature B.V
Subjects
Alumina
Applied sciences
Autoclaving
Boehmite
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Chemical precipitation
Dependence
Differential thermal analysis
Differential thermogravimetric analysis
Dopants
Exact sciences and technology
Materials science
Miscellaneous
Nanocomposites
Phase separation
Phase transitions
Phases
Roasting
Saline solutions
Technical ceramics
Thermal stability
Transitional aluminas
Zirconium dioxide
Thermal properties
Phase transformation
Phase composition
Doped materials
Specific surface area
Chemical composition
Zirconium Oxides
Microstructure
Alumina
Phase transitions
Oxide ceramics
Thermal stability
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Summary: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 α-Al2O3 so that phase transformation to α-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°C without transformation to α-Al2O3.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1018567230733