Chapter 35. Oxynitride Glasses: Preparation and Properties - Implications for High Temperature Behaviour of Silicon Nitride Ceramics

  1. Rajan Tandon,
  2. Andrew Wereszczak and
  3. Edgar Lara-Curzio
  1. Stuart Hampshire and
  2. Michael J. Pomeroy

Published Online: 27 MAR 2008

DOI: 10.1002/9780470291313.ch35

Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2

Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2

How to Cite

Hampshire, S. and Pomeroy, M. J. (2006) Oxynitride Glasses: Preparation and Properties - Implications for High Temperature Behaviour of Silicon Nitride Ceramics, in Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2 (eds R. Tandon, A. Wereszczak and E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291313.ch35

Author Information

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

Publication History

  1. Published Online: 27 MAR 2008
  2. Published Print: 1 JAN 2006

ISBN Information

Print ISBN: 9780470080528

Online ISBN: 9780470291313

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Keywords:

  • archimedes;
  • amorphous;
  • differential thermal analysis (DTA);
  • viscosities;
  • tetrahedral

Summary

Oxynitride glasses are found at triple point junctions and as intergranular films in silicon nitride based ceramics. The glass chemistry, particularly the content of modifyer, usually Y or a rare earth (RE) ion, and the volume fractions of these oxynitride glass phases within the ceramic influence the properties of silicon nitride, especially fracture behavior and also creep at high temperatures. As nitrogen substitutes for oxygen in silicate and alumino–silicate glass networks, increases are observed in glass transition and softening temperatures, viscosities, elastic moduli and microhardness. If changes are made to the cation ratios or different rare earth elements are substituted, properties such as viscosity can be increased further. These effects have implications for the mechanical properties of silicon nitride based ceramics, especially high temperature creep resistance. This paper provides an overview of the preparation and properties of oxynitride glasses and outlines the effect of composition on glass transition temperature and viscosity and discusses the effects on high temperature behavior of silicon nitride ceramics.