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In this study, we explored the consolidation, solid-solution formation, and high-temperature properties of carbides in the Ta–Nb–C system. Tantalum niobium carbide bulks can be consolidated by spark plasma sintering only at a temperature of 2200 °C using a 30-min dwell. The ceramics were homogeneous solid solutions and a linear dependence of the lattice parameters on the NbC content was observed. The average grain size varied between 10 and 30 μm, while the reference monolithic tantalum carbide consolidated under similar conditions had a grain size exceeding 40 μm. The room temperature strength linearly decreased from TaC to NbC. the 75 mol.% NbC ceramic showed almost an unchanged strength up to 1600 °C (450±20 MPa), following the linear decrease in strength to 290 MPa at 2000 °C. The monolithic tantalum carbide showed the lowest strength at 2000 °C among the studied ceramics.

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  This is the peer reviewed version of the following article: Demirskyi D, Nishimura T, Suzuki TS, Yoshimi K, Vasylkiv O. Consolidation and high-temperature properties of ceramics in the TaC–NbC system. J Am Ceram Soc. 2022; 105: 7567–7581, which has been published in final form at https://doi.org/10.1111/jace.18660. 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, carbides, hardness, toughness, solid solutions

Date published: 2022-07-27

Publisher: Wiley

Journal:

• Journal of the American Ceramic Society (ISSN: 15512916) vol. 105 issue. 12 p. 7567-7581

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 30)
• NIMS PA5180 (セラミックスプロセッシング - 70)

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4967

First published URL: https://doi.org/10.1111/jace.18660

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Updated at: 2024-11-16 08:30:55 +0900

Published on MDR: 2024-11-16 08:30:55 +0900