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alpha-SiAlON ceramics densified with mixed oxide sintering additives

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

Abstract: 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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