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In this study, we explored the consolidation, solid-solution formation and high-temperature properties of tantalum hafnium carbide with the 1 TaC:4 HfC ratio, that is, Ta0.2Hf0.8C. Tantalum hafnium carbide bulks can be consolidated using spark-plasma sintering only at temperatures exceeding 2200°C. The bulks prepared using a 40-min dwell at 2200°C had the lattice parameter a = 4.571(9) Å. Based on the three-point
flexural tests, it was observed that the toughness and strength of Ta0.2Hf0.8C remained high at 2000°C (3.4 ± 0.4 MPa m1/2, 500 ± 20 MPa). At 2000°C, majority of carbides show a plastic behavior, but the strain-stress curves of the SPSed Ta0.2Hf0.8C ceramic were linear. Using the shrinkage rate data during the SPS and the strain-stress data from the high-temperature flexure, we estimated the activation energies for the densification and flexure as 820 ± 20 kJ/mol and 1180 ± 120 kJ/mol, respectively.

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  This is the peer reviewed version of the following article: Demirskyi D, Borodianska H, Nishimura T, Suzuki TS, Yoshimi K, Vasylkiv O. Deformation-resistant Ta0.2Hf0.8C solid-solution ceramic with superior flexural strength at 2000°C. J Am Ceram Soc. 2021; 105: 512–524, which has been published in final form at https://doi.org/10.1111/jace.18072. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

Keyword: strength, ultra-high temperature ceramics, Spark plasma sintering, tantalum hafnium carbide

Date published: 2021-08-27

Publisher: Wiley

Journal:

• Journal of the American Ceramic Society (ISSN: 15512916) vol. 105 issue. 1 p. 512-524

Funding:

• NIMS PA3030 (粉体・セラミックス 結晶・界面の階層的構造制御による機能顕在化のための研究 40)
• NIMS PA5180 (セラミックスプロセッシング - 60 )

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4973

First published URL: https://doi.org/10.1111/jace.18072

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Updated at: 2024-11-21 16:32:03 +0900

Published on MDR: 2024-11-21 16:32:03 +0900