Refined continuum model on the behavior of intergranular films in silicon nitride ceramics

Heon Jin Choi, Gyeung Ho Kim, June Gunn Lee, Young Wook Kim

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

A refined continuum model has been proposed, based on the bond-strength consideration between cations and anions in the film, to address the effect of sintering additives on the behavior of intergranular glassy films (IGFs) in silicon nitride ceramics. The refined model indicates that the incorporation of additive ions in the film will modify the attractive van der Waals and repulsive steric forces. The model also implies that the charge and size of the ions, which determine the bond strength between cations and anions, and the amount of ions are important parameters to the force balance and behavior of the IGFs. Experimental evidence for (i) the effect of sintering additives on the thickness of IGFs in Si3N4 ceramics and (ii) the occurrences of the `squeezing out' of IGFs in hot-pressed Si3N4 under a moderate external pressure (e.g., 25 MPa) are discussed, to confirm the validity of the present model.

Original languageEnglish
Pages (from-to)2821-2827
Number of pages7
JournalJournal of the American Ceramic Society
Volume83
Issue number11
Publication statusPublished - 2000 Nov 1

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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