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The future for multicomponent SiAlON ceramics

Lookup NU author(s): Dr Katharine Liddell, Emeritus Professor Derek Thompson


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During the last 30 years, research on sialon ceramics has focused almost entirely on materials with good mechanical properties, initially developed for high-temperature applications, and subsequently towards lower-temperature (e.g. <1000°C) applications. The inherent structural simplicity of the β- and α-sialon phases, combined with their good combinations of mechanical properties, has led to them being the primary phases of interest, with other sialon phases only being researched if they played a role as secondary phases in the α- or β-sialon matrix. However, in the last few years, there has been increasing interest in more complex nitride-rich phases, which retain a three-dimensional linkage of [(Si,Al)X4] (X = N,C,O) tetrahedra and therefore, in principle, offer an excellence in mechanical properties comparable to silicon nitride, with associated good high-temperature stability. Also emergent are chemically complex phases which offer promise of development for non-structural areas. Thus ranges of LnTaN2O perovskite and Ln2Ta2O5N2 pyrochlore oxynitrides exhibit colours from red to green and offer promise for development as pigments, and the phase Ba2Nd7Si11N23 is the first of what promises to be a series of zeolite-like nitrogen ceramics incorporating large interstices.

Publication metadata

Author(s): Liddell K, Thompson DP

Editor(s): Komeya K., Mitomo M., Cheng Y.B.

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: Key Engineering Materials: Proceedings of the International Symposium on SiAlONs

Year of Conference: 2003

Pages: 1-10

ISSN: 1013-9826

Publisher: Trans Tech Publications Ltd.