Mechanical behavior and microstructure of SiC and SiC/TiB2 ceramics

Dong Hau Kuo, Waltraud M. Kriven

Research output: Contribution to journalArticle

Abstract

Toughness characteristics and associated microstructural behavior in two kinds of SiC and TiB2 particulate-reinforced SiC composites were studied. From indentation-strength tests, the Al2O2-doped, high volume fraction β-SiC/TiB2 showed a distinctive flaw tolerance and a higher retained strength in the long-crack region, as compared with β-SiC alone. On the other hand, the boron- and carbon-doped, low volume fraction, α-SiC/TiB2 exhibited a higher retained strength without an apparent improvement in flaw tolerance, as compared with α-SiC. Crack bridging and sliding and pullout of TiB2 particulates toughened the β-SiC/TiB2, while only crack bridging by TiB2 occurred in α-SiC/TiB2 with difficulty in grain sliding and pullout. A quantitative evaluation of the indentation-strength data revealed a sharp rising toughness curve for β-SiC/TiB2. The enhanced long-crack toughness originated from the weak interface created by the TiB2 and sintering additives.

Original languageEnglish (US)
Pages (from-to)51-57
Number of pages7
JournalJournal of the European Ceramic Society
Volume18
Issue number1
StatePublished - Jan 1 1998

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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