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Heterogeneous Nucleation in the Intergranular Phase of a SiAlON

Szabo, D. V.; Campbell, G. H.; Brulely, J.; Hoffmann, M. J.; Ruhle, M.

A SiAlON ceramic with yttria as a sintering aid has been fabricated and
subjected to a 1-h heat treatment at 1150-degrees-C.Microstructural
characterization by analytical electron microscopy and diffraction
analysis indicates that the residual intergranular phase crystallizes
into a metastable hexagonal phase (Y2SiAlO5N) and mullite.The mullite
appears as a characteristically shaped precipitate forming with a
definite orientation relationship on the (1010BAR) facets of SiAlON
grains.The absence of a residual amorphous film between the
precipitate and the SiAlON indicates that the precipitation occurred in
a heterogeneous manner on the surface of the SiAlON.

Zugehörige Institution(en) am KIT Institut für Keramik im Maschinenbau (IKM)
Publikationstyp Zeitschriftenaufsatz
Jahr 1992
Sprache Englisch
Identifikator ISSN: 0002-7820
KITopen ID: 1000007799
Erschienen in Journal of the American Ceramic Society
Band 75
Heft 1
Seiten 249-252
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