Microstructure and mechanical properties of sinter-post-HIPed Si3N4-SiC composites

Jian Feng Yang, Tohro Sekino, Yong Ho Choa, Koichi Niihara, Tatsuki Ohji

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

The microstructural evolution and mechanical properties of Si3N4-SiC composites obtained by the sinter-post-HIP process were investigated. SiC addition prohibited β-Si3N4 grain growth; however, the grain growth followed the empirical growth law, with exponents of 3 and 5 for the c- and the a-axis directions, respectively. Mechanical properties were strongly influenced by SiC addition and sintering conditions. Short-crack propagation behavior was measured and analyzed by the indentation-strength in-bending (ISB) method. The present composites had high short-crack toughness, compared with the values for monolithic Si3N4. The enhanced short-crack toughness was attributed to crack-tip bridging by the SiC particles.

Original languageEnglish
Pages (from-to)406-412
Number of pages7
JournalJournal of the American Ceramic Society
Volume84
Issue number2
DOIs
Publication statusPublished - 2001 Jan 1

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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