UNSPECIFIED (1995) BONDING SILICON-NITRIDE USING GLASS-CERAMIC. In: 10th Irish-Materials-Forum Conference (IMF10), SEP, 1994, UNIV ULSTER, COLERAINE, NORTH IRELAND.

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Abstract

Silicon nitride has been successfully bonded to itself using magnesium-aluminosilicate glass and glass-ceramic. For some samples, bonding was achieved using a diffusion bonder, but in other instances, following an initial degassing hold, higher temperatures were used in a nitrogen atmosphere with no applied load. For diffusion bonding, a small applied pressure at a temperature below which crystallisation occurs resulted in intimate contact. At slightly higher temperatures, the extent of the reaction at the interface and the microstructure of the glass-ceramic joint was highly sensitive to the bonding temperature. Bonding in a nitrogen atmosphere resulted in a solution-reprecipitation reaction. A thin layer of glass produced a ''dry'', glass-free joint, whilst a thicker layer resulted in a continuous glassy join across the interface. The chromium silicide impurities within the silicon nitride react with the nucleating agent in the glass ceramic, which may lead to difficulty in producing a fine glass-ceramic microstructure. Slightly lower temperatures in nitrogen resulted in a polycrystalline join but the interfacial contact was poor. It is hoped that one of the bonds produced may be developed to eventually form part of a graded joint between silicon nitride and a high temperature nickel alloy.

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:	ADVANCES IN ENGINEERING MATERIALS
Publisher:	TRANS TECH PUBLICATIONS
ISBN:	0-87849-690-4
ISSN:	0252-1059
Editor:	Hampshire, S and Buggy, M and Meenan, B and Brown, N
Date:	1995
Volume:	99-1
Number of Pages:	8
Page Range:	pp. 233-240
Publication Status:	Published
Title of Event:	10th Irish-Materials-Forum Conference (IMF10)
Location of Event:	UNIV ULSTER, COLERAINE, NORTH IRELAND
Date(s) of Event:	SEP, 1994
URI:	http://wrap.warwick.ac.uk/id/eprint/19505

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