Titanium effect on phase transformation and sintering behavior of transition alumina

The sintering behavior of doped γ-alumina powders studied by dilatometry and electron microscopy is analysed with a particular emphasis on the role of titanium on the various densification steps. Compared with other doping elements, such as Mg, Y and Zr, which do not improve α-phase densification, t...

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Bibliographic Details
Published inJournal of the European Ceramic Society Vol. 26; no. 12; pp. 2219 - 2230
Main Authors Lartigue-Korinek, Sylvie, Legros, Corinne, Carry, Claude, Herbst, Frédéric
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 2006
Elsevier
Subjects
Al 2O 3
Chemical and Process Engineering
Chemical Sciences
Doping elements
Electron microscopy
Engineering Sciences
Material chemistry
Microstructure
Sintering
TiO 2
γ-Al 2O 3
Sintering
Doping elements
Microstructure
Electron microscopy
TiO 2
γ-Al 2O 3
Al 2O 3
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Summary:The sintering behavior of doped γ-alumina powders studied by dilatometry and electron microscopy is analysed with a particular emphasis on the role of titanium on the various densification steps. Compared with other doping elements, such as Mg, Y and Zr, which do not improve α-phase densification, titanium enhances this densification step by a fast decrease of internal colony porosity. This internal densification of single crystalline zones is attributed to the lengthening of the elementary bricks in titanium-doped samples. A transient increase in densification rate is also observed, corresponding to the precipitation when during grain growth, grain boundaries become saturated with titanium. Final densities close to the theoretical values are obtained.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2005.04.006