1. Properties of Rare Earth Oxynitride Glasses and the Implications for High Temperature Behaviour of Silicon Nitride Ceramics

  1. Edgar Lara-Curzio and
  2. Michael J. Readey
  1. Stuart Hampshire and
  2. Michael J. Pomeroy

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291191.ch1

28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4

28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4

How to Cite

Hampshire, S. and Pomeroy, M. J. (2004) Properties of Rare Earth Oxynitride Glasses and the Implications for High Temperature Behaviour of Silicon Nitride Ceramics, in 28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4 (eds E. Lara-Curzio and M. J. Readey), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291191.ch1

Author Information

  1. Materials and Surface Science Institute University of Limerick, Limerick, Ireland

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2004

ISBN Information

Print ISBN: 9780470051528

Online ISBN: 9780470291191

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Keywords:

  • oxynitride glasses;
  • silicon nitride;
  • ceramics;
  • oxynitride films;
  • ionic radii

Summary

Rare earth oxynitride glasses occur as intergranular phases in silicon nitride and sialon ceramics. The volume fractions and compositions of these glass phases control the high temperature creep behaviour of the material. Investigations on oxynitride glass formation and properties have shown that the substitution of nitrogen for oxygen increases the glass transition and softening temperatures, viscosity, elastic modulus and hardness. By changing the cation ratios or the type of rare earth cation, properties such as viscosity can be increased further. This paper outlines the effects of composition on properties such as glass transition temperature and viscosity which have important implications for creep resistance of silicon nitride based ceramics containing intergranular oxynitride films.