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Influence of yttria content on the preparation of nanocrystalline yttria-doped zirconia

Published online by Cambridge University Press:  03 March 2011

Dai Huang ,
K.R. Venkatachari  and
Gregory C. Stangle
Dai Huang
Affiliation:
Institute for Self-Propagating High-Temperature Synthesis, New York State College of Ceramics at Alfred University, Alfred, New York, 14802
K.R. Venkatachari
Affiliation:
Institute for Self-Propagating High-Temperature Synthesis, New York State College of Ceramics at Alfred University, Alfred, New York, 14802
Gregory C. Stangle
Affiliation:
Institute for Self-Propagating High-Temperature Synthesis, New York State College of Ceramics at Alfred University, Alfred, New York, 14802
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Abstract

Nanocrystalline zirconia doped with 0–10 mol % Y2O3 has been prepared by a combustion synthesis process, followed by a rapid densification process. The concentration of Y2O3 in the as-reacted zirconia appeared to have a significant influence on the reduction of the crystallite size, in the combustion temperature range studied (450 °C–550 °C), as well as on the stabilization of the tetragonal and/or cubic phases. The green compacts were densified by a fast-firing process. During fast-firing, the dwell temperature significantly affected the final average grain size and the final density of the article. On the other hand, the ranges of heating rates and dwell times that were used in this study were shown to have a much less significant effect on the article's final density and final average grain size. The yttria content had the largest influence on the final density and final average grain size. The densification took place much more rapidly in the 4 mol % Y2O3-ZrO2 samples than in the 10 mol % Y2O3-ZrO2 samples. In particular, the difference in densification rates between the samples with different Y2O3 content was attributed to the influence and magnitude of the associated grain-growth process. It was determined, however, that a high final density (>99% ρth) and a very fine final average grain size (<200 nm) could be simultaneously achieved with each of three different heating rates for the 4 mol% Y2O3-ZrO2 articles.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 3 , March 1995 , pp. 762 - 773
Copyright
Copyright © Materials Research Society 1995

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