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Transient Viscous Phase Reaction Sintered (Tvprs) Silicon Oxynitride Ceramics.

Published online by Cambridge University Press:  25 February 2011

Kevin P. Plucknett  and
David S. Wilkinson
Kevin P. Plucknett
Affiliation:
Dept. of Materials Science and Engineering, McMaster University, Hamilton, Ontario, CANADA
David S. Wilkinson
Affiliation:
Dept. of Materials Science and Engineering, McMaster University, Hamilton, Ontario, CANADA
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Abstract

High density silicon oxynitride ceramics were fabricated by reaction-sintering a mixtureof silicon nitride and silica without the use of sintering aids. Precursor silicon nitride compacts were prepared by conventional means after which they were subjected to a lowtemperature oxidation heattreatment (∼1000ºC) producing a composite silicon nitride/silica compact. Oxidized compacts were then reaction-sintered in a nitrogen atmosphere at temperatures between 1400 and 1800ºC using a range of protective ‘powder-bed’ compositions. A ‘powder-bed’ comprising a mixture of boron nitride, silicon nitride and silica was found to be most effective in preventing decomposition and subsequent weight loss. Nearly complete reactive transformation to silicon oxynitride was observed under optimised sintering conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 287: Symposium K – Silicon Nitride Ceramics–Scientific and Technological Advances , 1992 , 381
Copyright
Copyright © Materials Research Society 1993

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