Silicon nitride grain boundary glasses: Chemistry, structure and properties

Stuart Hampshire, Michael J. Pomeroy

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Silicon nitride is recognised as a high performance material for both wear resistant and high temperature structural applications. Oxide sintering additives such as yttrium oxide and alumina are used to provide conditions for liquid phase sintering, during which the additives react with surface silica present on the Si3N4 particles and some of the nitride to form an oxynitride liquid which allows densification and transformation of α- to β-Si3N4 and on cooling remains as an intergranular oxynitride glass. This paper provides an overview of liquid phase sintering of silicon nitride ceramics, grain boundary oxynitride glasses and the effects of chemistry and structure on properties. As nitrogen substitutes for oxygen in oxynitride glasses, increases are observed in glass transition and softening temperatures, viscosities, elastic moduli and microhardness. These property changes are compared with known effects of grain boundary glass chemistry in silicon nitride ceramics.

Original languageEnglish
Title of host publicationAdvanced Engineering Ceramics and Composites
PublisherTrans Tech Publications Ltd
Pages46-51
Number of pages6
ISBN (Print)9783037851814
DOIs
Publication statusPublished - 2011

Publication series

NameKey Engineering Materials
Volume484
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795

Keywords

  • Chemistry-microstructure-property relationships
  • Intergranular glass
  • Liquid phase sintering
  • Microstructural engineering
  • Oxynitride glass
  • Silicon nitride

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