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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.

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• In Copyright
  

Keyword: hafnium carbide, grain size, flexural strength, high-temperature materials

Date published: 2021-08-21

Publisher: Elsevier BV

Journal:

• Journal of the European Ceramic Society (ISSN: 09552219) vol. 41 issue. 15 p. 7442-7449

Funding:

• National Institute for Materials Science

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4974

First published URL: https://doi.org/10.1016/j.jeurceramsoc.2021.08.038

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Updated at: 2024-11-21 16:32:16 +0900

Published on MDR: 2024-11-21 16:32:16 +0900