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Improvement in mechanical properties of sintered zirconia (3% yttria stabilized) by glass infiltration

Published online by Cambridge University Press:  31 January 2011

A. Balakrishnan ,
B.B. Panigrahi ,
Min-Cheol Chu ,
T.N. Kim ,
Kyung-Jin Yoon  and
Seong-Jai Cho
A. Balakrishnan
Affiliation:
Department of Information and Electronic Materials Engineering, Paichai University, Daejeon, 302-735, Republic of Korea
B.B. Panigrahi*
Affiliation:
Division of Advanced Technology, Korea Research Institute of Standards and Science, Yuseong, Daejeon, 305-340, Republic of Korea
Min-Cheol Chu
Affiliation:
Division of Advanced Technology, Korea Research Institute of Standards and Science, Yuseong, Daejeon, 305-340, Republic of Korea
T.N. Kim
Affiliation:
Department of Information and Electronic Materials Engineering, Paichai University, Daejeon, 302-735, Republic of Korea
Kyung-Jin Yoon
Affiliation:
Division of Advanced Technology, Korea Research Institute of Standards and Science, Yuseong, Daejeon, 305-340, Republic of Korea
Seong-Jai Cho*
Affiliation:
Division of Advanced Technology, Korea Research Institute of Standards and Science, Yuseong, Daejeon, 305-340, Republic of Korea
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)Address all correspondence to these authors. e-mail: [email protected]
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Abstract

The goal of this work was to improve the strength of sintered zirconia (3 mol% yttria stabilized) by surface treatment, using a low expansion glass (Mg3Al2Si6O18) at high temperature. The room-temperature strength was increased by about 42% when the glass was penetrated for 30 min. There was a drastic increase in the Weibull modulus. However, the longer holding time led to grain coarsening and the excess glass deteriorated the strength. The magnitude of the strength increment was on the order of surface stress measured experimentally and thermo-elastic stress predicted theoretically. A significant contribution of phase transformation of zirconia from tetragonal to monoclinic phase on the residual stress was also found. Furthermore, compared to the as-sintered zirconia, the glass-treated sample (penetrated for 30 min) exhibited relatively higher strength at elevated temperature (750 °C) and also showed a significant improvement in the thermal shock resistance behavior.

Keywords

StrengthThermal stressesAnnealing
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 9 , September 2007 , pp. 2550 - 2557
Copyright
Copyright © Materials Research Society 2007

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