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Oxidation Behaviour of Zirconia-Sialon Composites

Published online by Cambridge University Press:  25 February 2011

Yibing Cheng  and
Derek P. Thompson
Yibing Cheng
Affiliation:
Department of Materials Engineering, Monash University, Melbourne, Victoria 3168, Australia
Derek P. Thompson
Affiliation:
Department of Mechanical, Materials & Manufacturing Engineering, University of Newcastle upon Tyne, NEI 7RU, United Kingdom
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Abstract

In yttria densified ZrO2-sialon composites, an increase in β′:O′-sialon ratio results in a structural change in the zirconia phase because an increasing amount of nitrogen dissolves in the zirconia structure as the overall composition becomes increasingly nitrogen rich. Both ZrN and nitrogen-containing zirconia (N-ZrO2) are observed in the β′-ZrO2 composite and these phases show a poor oxidation performance above 600°C. However, the introduction of small amounts of O′ phase into the β′-ZrO2 composite has provided an effective oxygen-rich barrier to reduce the diffusion rate of nitrogen in zirconia and therefore O′-β′-ZrO2 composites showed superior oxidation resistance compared with β′-ZrO2 materials at temperatures between 600 and 1200°C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 287: Symposium K – Silicon Nitride Ceramics–Scientific and Technological Advances , 1992 , 527
Copyright
Copyright © Materials Research Society 1993

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References

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