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Lookup NU author(s): Emeritus Professor Derek Thompson
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Silicon nitride samples were pressureless sintered with up to 5 w/o MgO to give densities in the range 98-99% of theoretical. After pressureless sintering, selected samples were placed in a vacuum heat treatment furnace surrounded by a carbon bed in a carbon crucible at a pressure of less than 4×10 -4 mbar, and vacuum heat treated at different temperatures and times to remove grain-boundary glass. The results showed that this was substantially achieved at 1575°C for 3h and that increasing the time to 5 hours gave still further improvement. SEM images, EDX analysis and oxidation tests provided additional evidence for the removal of Mg from the samples.
Author(s): Demir V, Thompson DP
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: Materials Science Forum: 5th International Symposium on Nitrides
Year of Conference: 2007
Pages: 107-112
ISSN: 0255-5476 (print) 1422-6375 (online)
Publisher: Trans Tech Publications Ltd.
URL: http://dx.doi.org/10.4028/0-87849-439-1.107
DOI: 10.4028/0-87849-439-1.107
Library holdings: Search Newcastle University Library for this item
ISBN: 9780878494392
