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Preparation of nanocrystalline yttria-stabilized zirconia

Published online by Cambridge University Press:  03 March 2011

K.R. Venkatachari ,
Dai Huang ,
Steven P. Ostrander ,
Walter A. Schulze  and
Gregory C. Stangle
K.R. Venkatachari
Affiliation:
Institute for Self-Propagating High-Temperature Synthesis, New York State College of Ceramics at Alfred University, Alfred, New York 14802
Dai Huang
Affiliation:
Institute for Self-Propagating High-Temperature Synthesis, New York State College of Ceramics at Alfred University, Alfred, New York 14802
Steven P. Ostrander
Affiliation:
Institute for Self-Propagating High-Temperature Synthesis, New York State College of Ceramics at Alfred University, Alfred, New York 14802
Walter A. Schulze
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 powder with an average crystallite size of 8–12 nm, which was produced by a combustion synthesis process, was used to prepare dense, nanocrystalline articles. Green compacts of high green density were prepared by dry pressing and densified by a fast-firing process. During fast-firing, the dwell temperature significantly affected the final grain size and final density. On the other hand, the ranges of heating rates and dwell times that were used had a much less significant effect on the final density and final grain size. It was determined, however, that a high final density (>99% ρth) and a very fine final average grain size (<200 nm) can be simultaneously achieved under three different firing conditions. The high densification rates are, in part, a result of the minimal coarsening that the particles undergo when the sample is taken rapidly through the temperature regime in which surface diffusion predominates to the temperature regime in which the densification mechanisms of grain boundary and lattice diffusion predominate.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 3 , March 1995 , pp. 756 - 761
Copyright
Copyright © Materials Research Society 1995

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References

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