High-temperature deformation in bulk polycrystalline hafnium carbide consolidated using spark plasma sintering

D. Demirskyi, O. Vasylkiv, K. Yoshimi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In this study, we report the three-point flexural strength and fracture toughness of monolithic hafnium carbide up to 2000 °C. HfC with different grain sizes was consolidated using the spark plasma sintering method. Coarse-grained monoliths showed a weak dependence on the strain rate during high-temperature tests at 1600 °C–2000 °C. In contrast, results for the ceramics with a grain size below 20 μm indicated a positive dependence of the yield strength vs strain rate. This allowed us to identify the activation energy for high-temperature deformation in flexure as 370 kJ/mol. This level of activation energy is in satisfactory agreement with reports about the diffusion of C in hafnium carbide.

Original languageEnglish
Pages (from-to)7442-7449
Number of pages8
JournalJournal of the European Ceramic Society
Volume41
Issue number15
DOIs
Publication statusPublished - 2021 Dec

Keywords

  • Flexural strength
  • Grain size
  • Hafnium carbide
  • High-temperature materials

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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