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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. <1000degreesC) applications. The inherent structural simplicity of the beta- and alpha- 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 alpha- or beta-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)X-4] (X = N,C,O) tetrahedra and therefore, in principle, offer an excellence in mechanical properties comparable to sincon nitride, with associated good hightemperature stability. Also emergent are chemically. complex phases which offer promise of development for non-structural areas. Thus ranges of LnTaN(2)O perovskite and Ln(2)Ta(2)O(5)N(2) 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.
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: Siaions: International Symposium on SiAlONs
Year of Conference: 2003
Publisher: Trans Tech Publications Ltd.
Library holdings: Search Newcastle University Library for this item
Series Title: Key Engineering Materials