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Chemically Induced Defects in Oxynitride Glasses

Published online by Cambridge University Press:  25 February 2011

Donald R. Messier  and
Parimal J. Patel
Donald R. Messier
Affiliation:
U.S. Army Research Laboratory Materials Directorate, Watertown, MA 02172–0001
Parimal J. Patel
Affiliation:
U.S. Army Research Laboratory Materials Directorate, Watertown, MA 02172–0001
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Abstract

The ultimate usefulness of oxynitride glasses and fibers depends upon the minimization or elimination of metallic defects that arise during processing. Despite this, the origins and chemistry of such defects in oxynitride glasses have received scant attention in the literature. The defects reduce glass transparency and cause oxynitride glass fibers to fail at relatively low stress levels. The same types of defects undoubtedly occur in the grain boundary glass phase of sintered Si3N4with unknown effects on material properties.

Exampls are shown of Si-rich metallic defects in oxynitride glasses, and their effects on glass and fiber properties are discussed. Chemical reactions that produce the defects are considered, as are chemical analysis results supporting the proposed reaction mechanisms.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 287: Symposium K – Silicon Nitride Ceramics–Scientific and Technological Advances , 1992 , 365
Copyright
Copyright © Materials Research Society 1993

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References

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