In situ-toughened silicon carbide-titanium carbide composites

Kyeong Sik Cho, Young Wook Kim, Heon Jin Choi, June Gunn Lee

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

A process based on liquid-phase sintering and subsequent annealing for grain growth is presented to obtain in situ-toughened SiC-30 wt% TiC composites. Its microstructures consist of uniformly distributed elongated α-SiC grains, matrixlike TiC grains, and yttrium aluminum garnet (YAG) as a grain boundary phase. The composites were fabricated from β-SiC and TiC powders with the liquid forming additives of Al2O3 and Y2O3 by hot pressing. During the subsequent heat treatment, the β → α phase tansformation of SiC led to the in situ growth of elongated α-SiC grains. The fracture toughness of the SiC-30 wt% TiC composites after 6-h annealing was 6.9 MPa·m1/2, approximately 60% higher than that of as-hot-pressed composites (4.4 MPa·m1/2). Bridging and crack deflection by the elongated α-SiC grains appear to account for the increased toughness of this new class of composites.

Original languageEnglish
Pages (from-to)1711-1713
Number of pages3
JournalJournal of the American Ceramic Society
Volume79
Issue number6
DOIs
Publication statusPublished - 1996 Jun

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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