Yttrium oxynitride glasses: Properties and potential for crystallisation to glass-ceramics

S. Hampshire, E. Nestor, R. Flynn, J. L. Besson, T. Rouxel, H. Lemercier, P. Goursat, M. Sebai, D. P. Thompson, K. Liddell

Research output: Contribution to journalArticlepeer-review

Abstract

Silicon nitride-based ceramics contain oxynitride glass phases at the grain boundaries which can impair subsequent high temperature properties. Studies of bulk glasses in the Y-Si-Al-O-N system have been carried out and it has been shown that up to 10 atomic % N can be incorporated into these oxynitride glasses. Nitrogen increases the viscosity, hardness and glass transition temperature of the glasses. Heat treatments of Y-Si-Al-O-N glasses have been carried out and the crystalline phases formed are reported. Further improvements are possible if glass-ceramic processes using two-stage heat treatments are introduced. This paper reviews the development of oxynitride glasses, the effects of nitrogen on properties and reports on the glassceramic heat treatments.

Original languageEnglish
Pages (from-to)261-273
Number of pages13
JournalJournal of the European Ceramic Society
Volume14
Issue number3
DOIs
Publication statusPublished - 1994

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