Flexural strength behavior of a ZrB2–TaB2 composite consolidated by non-reactive spark plasma sintering at 2300 °C

Dmytro Demirskyi, Oleg Vasylkiv

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

A bulk zirconium–tantalum diboride ceramic composite was consolidated by non-reactive spark plasma sintering (SPS) at 2300 °C. In order to consolidate the ZrB2–44 wt% TaB2 composite and restrict grain-growth, a special loading procedure was used. Pressure was applied and released at 2150 °C and 1250 °C, respectively. These SPS conditions allowed us to obtain a crack-free bulk composite with a grain size of 4–8 μm. Flexural strength at temperatures up to 1800 °C was measured for the ZrB2–TaB2 composite. Importantly, at 1600 °C, the strength was 336 ± 23 MPa, which is superior to that of monolithic ZrB2. Moreover, the ZrB2–TaB2 composite only showed plastic behavior at 1800 °C, a finding that is atypical for ZrB2-based ceramics.

Original languageEnglish
Pages (from-to)31-35
Number of pages5
JournalInternational Journal of Refractory Metals and Hard Materials
Volume66
DOIs
Publication statusPublished - 2017 Aug 1
Externally publishedYes

Keywords

  • Composite
  • Spark plasma sintering
  • Strength
  • Tantalum diboride
  • Zirconium diboride

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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