Processing Low-Oxide ZrB2 Ceramics with High Strength Using Boron Carbide and Spark Plasma Sintering

David Pham, Joseph Houston Dycus, James M. LeBeau, Venkateswara R. Manga, Krishna Muralidharan, Erica L. Corral, W. Fahrenhotlz

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

A phase diagram-assisted powder processing approach is shown to produce low-oxygen (0.06 wt%O) ZrB2 ceramics using minimal B4C additions (0.25 wt%) and spark plasma sintering. Scanning electron microscopy and scanning transmission electron microscopy with elemental spectroscopy are used to identify “trash collector” oxides. These “trash collector” oxides are composed of manufacturer metal powder impurities that form discreet oxide particles due to the absence of standard Zr–B oxides found in high oxygen samples. A preliminary Zr–B–C–O quaternary thermodynamic database developed as a part of this work was used to calculate the ZrO2–B4C pseudobinary phase diagram and ZrB2–ZrO2–B4C pseudoternary phase diagrams. We use the calculated equilibrium phase diagrams to characterize the oxide impurities and show the direct reaction path that allows for the formation of ZrB2 with an oxygen content of 0.06 wt%, fine grains (3.3 μm) and superior mechanical properties (flexural strength of 660 MPa).

Original languageEnglish (US)
Pages (from-to)2585-2592
Number of pages8
JournalJournal of the American Ceramic Society
Volume99
Issue number8
DOIs
StatePublished - Aug 1 2016

Keywords

  • microscopy
  • processing
  • spark plasma sintering
  • transmission electron
  • ultra-high temperature ceramics
  • zirconium/zirconium compounds

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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