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Melilite Formation in a Samarium-Stabilized alpha-Sialon Ceramic during Postsintering Heat Treatments
Zhejiang.
Luleå tekniska universitet.
Luleå tekniska universitet.
Arrhenius laboratory.
1997 (English)In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 80, no 3, p. 817-821Article in journal (Refereed) Published
Abstract [en]

The formation of the melilite solid solution phase (M), Sm2Si3-xAlxO3xN4-x, in an alpha-sialon sample of overall composition Sm0.6Si9.28Al2.69O1.36N14.76, was studied as a function of time in the temperature interval 13751525C. The alpha-sialon ceramic contained only minor amounts of the 21R sialon polytype and some residual grain-boundary glass before heat treatment. In situ studies by high-temperature X-ray diffraction were combined with postsintering heat treatment followed by quenching. The M-phase was found to be formed by two different mechanisms: either crystallization of the residual grain-boundary liquid or a direct decomposition of the alpha-sialon phase. The liquid crystallized during the first 1015 min of heat treatment, yielding a rapid M-phase formation, and further formation of M-phase continued at a much slower rate, related to the decomposition of alpha-sialon

Place, publisher, year, edition, pages
1997. Vol. 80, no 3, p. 817-821
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-6113Local ID: 45087cf0-fd65-11db-b816-000ea68e967bOAI: oai:DiVA.org:ltu-6113DiVA, id: diva2:978990
Note
Godkänd; 1997; 20070508 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-21Bibliographically approved

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