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Microstructural, mechanical, and electrical characteristics of alumina-reinforced ytterbia-stabilized cubic zirconia-based composites

Published online by Cambridge University Press:  03 March 2011

Masashi Wada ,
Tohru Sekino ,
Takafumi Kusunose ,
Tadachika Nakayama  and
Koichi Niihara
Masashi Wada*
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogahoka, Ibaraki, Osaka 567-0047, Japan
Tohru Sekino
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogahoka, Ibaraki, Osaka 567-0047, Japan
Takafumi Kusunose
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogahoka, Ibaraki, Osaka 567-0047, Japan
Tadachika Nakayama
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogahoka, Ibaraki, Osaka 567-0047, Japan
Koichi Niihara
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogahoka, Ibaraki, Osaka 567-0047, Japan
*
a) Address all correspondence to this author. e-mail: wada15@sanken.osaka-u.ac.jp
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Abstract

Al2O3-dispersed Yb2O3-stabilized cubic-ZrO2 (YbSZ) composites are fabricated by pressureless sintering of composite powders to obtain fine and homogeneous microstructures by the solution chemistry route. Al2O3 particles are deposited on ZrO2 powders by the precipitation of aluminum nitrate followed by calcination in air. The sinterability of the composites was affected by the calcination temperature. Microstructures of the sintered bodies are dependent on the Al2O3 content. For the5 vol% Al2O3-dispersed composite, fine Al2O3 particles were mainly located insidethe grains of zirconia, whereas relatively large Al2O3 particles almost dispersed at the grain boundaries when the Al2O3 content was increased. The grain growth of YbSZ was suppressed by the Al2O3 addition, and the refinement of the matrix grain improved the fracture strength of YbSZ. The YbSZ and YbSZ/Al2O3 composites exhibited almost similar ionic conductivity at high temperatures of around 1000 °C.

Keywords

CompositeStrengthIonic conductor
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 5 , May 2004 , pp. 1455 - 1460
Copyright
Copyright © Materials Research Society 2004

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