Phase transformation, microstructure and mechanical properties of Si3N4/SiC composite

Jian Feng Yang, Tatsuki Ohji, Tohru Sekino, Chun Liang Li, Koichi Niihara

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

The influence of SiC fine particle dispersion on phase transformation, microstructure and mechanical properties of Si3N4 ceramics has been investigated. While the SiC dispersion simply decreased the densification, it caused complex effects on the phase transformation behavior; the transformation was enhanced at low temperatures but suppressed at high temperatures. Since the phase transformation is a nucleation-grain growth process of β-Si3N4, SiC particles plausibly enhance formation of a great number of β-Si3N4 nuclei due to the high Si3N4-SiC interfacial energy, but inhibit their further phase transformation and grain growth. The mean size and the aspect ratio of the obtained β-Si3N4 grains decreased as a result of the SiC dispersion, thus bringing about increased flexural strength and decreased fracture toughness.

Original languageEnglish
Pages (from-to)2179-2183
Number of pages5
JournalJournal of the European Ceramic Society
Volume21
Issue number12
DOIs
Publication statusPublished - 2001 Oct 1

Keywords

  • Composites
  • Mechanical properties
  • Phase transformation
  • SiC
  • SiN
  • Sintering

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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