UNSPECIFIED (1994) CRYSTALLIZATION OF GRAIN-BOUNDARY PHASES IN SILICON-NITRIDE AND SIALON CERAMICS. In: International Conference on Silicon Nitride-Based Ceramics, STUTTGART, GERMANY, OCT 04-06, 1993. Published in: SILICON NITRIDE 93, 89-9 pp. 333-337.

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Abstract

A survey is presented of the principles and practice of tailoring: sintering liquid composition and processing cycle to enable crystallisation of intergranular phases in silicon nitride and sialon ceramics, Critical features in sialon ceramics are the O/N balance in residual glasses and post-sintering heal-treatment temperatures to enable nucleation of either intermediate phases at constant composition or oxide phases with re-partitioning of non stoichiometric components in beta' or alpha' solid solutions. Crystallisation of disilicate phases in non sialon compositions exemplifies a problem in control of polymorphs with differing atomic volumes. Crystallisation of intergranular phases has an influence mainly on high-temperature mechanical and environmental behaviour of these ceramics.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	T Technology > TP Chemical technology T Technology > TA Engineering (General). Civil engineering (General)
Series Name:	KEY ENGINEERING MATERIALS
Journal or Publication Title:	SILICON NITRIDE 93
Publisher:	TRANS TECH PUBLICATIONS
ISBN:	0-87849-668-8
ISSN:	0252-1059
Editor:	Hoffmann, MJ and Becher, PF and Petzow, G
Date:	1994
Volume:	89-9
Number of Pages:	5
Page Range:	pp. 333-337
Publication Status:	Published
Title of Event:	International Conference on Silicon Nitride-Based Ceramics
Location of Event:	STUTTGART, GERMANY
Date(s) of Event:	OCT 04-06, 1993
URI:	http://wrap.warwick.ac.uk/id/eprint/19475

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