Slow crack growth behavior in Si3N4 sintered with Yb2Si2O7 tie-line composition additives

Heon Jin Choi, Hyeong Jong Kim, June Gunn Lee, Young Wook Kim

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1 Citation (Scopus)

Abstract

Slow crack growth behavior of two gas pressure sintered Si3N4 ceramics with different additives; a Yb2Si2O7 composition and an A12O3-Y2O3 composition, was investigated by constant stress-rate ("dynamic fatigue") testing at 1400°C. The slow crack growth parameter, n, was 14.7 and 6.3 for Si3N4 with Yb2Si2O7 and AI2O3-Y2O3 compositions, respectively. Superior crack growth resistance of Si3N4 with Yb2Si2O7 composition was due to its higher refractoriness of intergranular glassy films, compared to Si3N4 with A12O3-Y2O3 composition.

Original languageEnglish
Pages (from-to)471-475
Number of pages5
JournalJournal of the European Ceramic Society
Volume21
Issue number4
DOIs
Publication statusPublished - 2001 Apr 1

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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