Vapour transport of magnesia into reaction-bonded silicon nitride

Magnesia, as a sintering additive, can be introduced into reaction-bonded silicon nitride (RBSN) via vapor-phase transport. The principal process variables were studied; a controlling factor was found to be the amount of silica on the internal surfaces of the ceramic. Through a controlled oxidation...

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Bibliographic Details
Published in:Journal of materials science 1995-03, Vol.30 (6), p.1425-1428
Main Authors: PUGH, M. D, MOULSON, A. J
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Structural ceramics
Technical ceramics
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Summary:Magnesia, as a sintering additive, can be introduced into reaction-bonded silicon nitride (RBSN) via vapor-phase transport. The principal process variables were studied; a controlling factor was found to be the amount of silica on the internal surfaces of the ceramic. Through a controlled oxidation of the RBSN, the amount of magnesia introduced to the compact was increased to about 2 wt pct, allowing a postsintered density of 93 percent of theoretical to be achieved. Further increases in internal oxidation, and consequent magnesia uptake, were limited by the oxidation of Si3N4 whiskers on the surface of the RBSN and in its pore structure. (Author)
ISSN:0022-2461
1573-4803
DOI:10.1007/BF00375242