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This study reports the formation of a ceramic composite consisting only of boride phases with an artificially created hierarchical superstructure. Such a composite was formed during the reaction-driven consolidation process using a mixture of ZrB2, tantalum and amorphous boron powders. The homogeneity of the reaction between these powders at 1900 °C allowed the forming of a highly reproducible and repetitive superstructure where Ta3B4 forms a chain-like mesh which entraps the ZrB2, ZrB, TaB and (Zr,Ta)B2 phases. The multiboride ceramic composite exhibited extremely high hardness: 28.6±3.2 GPa or 22.6±0.6 GPa. These were estimated using 98 N and 196 N loads, respectively. At 2000 °C, the multiboride composite showed a strength of nearly 400 MPa and fractured in an elastic manner at the loading rate of 2.5 mm/min. This level of strength is usually observed for the bulk zirconium diboride at room temperature. The main factors leading to the improvement of the mechanical properties were considered to be the formation of the (Zr,Ta)B2 solid solution as well the composite structure.

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  This is the peer reviewed version of the following article: Demirskyi D, Suzuki TS, Yoshimi K, Vasylkiv O. High-temperature reactive synthesis of the Zr–Ta multiboride with a supercomposite structure. J Am Ceram Soc. 2022; 105: 6989–7002, which has been published in final form at https://doi.org/10.1111/jace.18653. 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: Composites, Borides, Hardness, Strength

Date published: 2022-07-25

Publisher: Wiley

Journal:

• Journal of the American Ceramic Society (ISSN: 15512916) vol. 105 issue. 11 p. 6989-7002

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 45)
• NIMS PA5180 (セラミックスプロセッシング - 55 )

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4969

First published URL: https://doi.org/10.1111/jace.18653

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Updated at: 2024-11-21 16:31:29 +0900

Published on MDR: 2024-11-21 16:31:29 +0900