Sintering properties and thermal depletion of boron in zirconia-zirconium diboride conductive ceramic

W. J. Kelvin Chew, M. Amiriyan, A. Yaghoubi, S. Ramesh, J. Purbolaksono, R. Tolouei, W. D. Teng, D. K. Agrawal

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Zirconium diboride (ZrB2) as an ultrahigh temperature ceramic (UHTC) with excellent electrical conductivity is a potential candidate for harsh-environment devices. Fabrication of ZrB2-based materials however involves processing in the active oxidation regime (T>1200 K) leading to depletion of boron. We report a simple technique to prevent degradation during pressureless sintering of zirconia-matrix composites of ZrB2. The composites prepared using this method reach the percolation threshold at ~10 wt% ZrB2 and metal-like conductivity (~105 S/m) at 25 wt% ZrB2 in agreement with the general effective media theory. The improved mechanical properties are also discussed in terms of various toughening mechanisms.

Original languageEnglish (US)
Pages (from-to)13313-13320
Number of pages8
JournalCeramics International
Volume40
Issue number8 PART B
DOIs
StatePublished - Sep 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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