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alpha-SiAlON ceramics densified with mixed oxide sintering additives

Mandal, H.; Oberacker, R.; Hoffmann, M. J.; Thompson, D. P.

Densification and stabilization of alpha-sialon ceramics were
investigated by using oxides of large cations (Sr2+, La3+, Ce3+, Nd3+)
and their equi-molar mixtures with CaO or Yo(2)O(3). All multi-cation
and single cation (only Nd3+ and Ce3+) doped samples could be densified
to nearly full density even by pressureless sintering. X-ray
diffraction of the samples densified with single cations revealed that
the ol-sialon structure could accomodate Nd3+ or Ce3+ cations. In Sr-
and La- systems, however, S- (similar to
SrO:1.3A1(2)O(3):0.7Si(2)N(2)O) and N- (La3Si8O4N11) phases were found
to be stable rather than a-sialon. In case of multi-cations,
alpha-sialon was observed only as a matrix phase. EDX measurements
proved that Ce-, La- and Sr- cations could be accomodated into the
alpha-sialon structure with the presence of calcium or ytterbium. SEM
studies revealed that almost glass free grain boundaries could be
obtained by careful design of starting compositions.

Zugehörige Institution(en) am KIT Institut für Keramik im Maschinenbau (IKM)
Publikationstyp Proceedingsbeitrag
Jahr 2000
Sprache Englisch
Identifikator ISBN: 0-87849-850-8
ISSN: 0255-5476
KITopen-ID: 1000007693
Erschienen in Proceedings of the Second International Symposium on Nitrides. Hrsg.: S. Hampshire
Verlag Trans Tech Publ., Uetikon-Zuerich
Seiten 207-212
Serie Nitrides and oxynitrides; ; Materials science forum
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