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Bulk niobium diboride ceramics were consolidated by SPS at 1900C. SPS resulted in dense specimens with a density of 98% of the theoretical density and a mean grain size of 6 µm. During the SPS consolidation, the hexagonal boron nitride (h-BN) was formed from B2O3 on the powder particle surface and residual adsorbed nitrogen. The room-temperature strength of these NbB2 bulks was 420 MPa. The flexural strength of the NbB2 ceramics remained unchanged up to 1600 C. At 1700 C an increase in strength to 450 MPa was observed, which was accompanied by the disappearance of the secondary h-BN phase. Finally, at 1800 C signs of plastic deformation were observed. Fractographic analysis revealed a number of etching pits and step-like surfaces suggestive of high-temperature deformation.

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  This is the peer reviewed version of the following article: Demirskyi D, Solodkyi I, Nishimura T, Sakka Y, Vasylkiv O. High-temperature strength and plastic deformation behavior of niobium diboride consolidated by spark plasma sintering. J Am Ceram Soc. 2017; 100: 5295–5305, which has been published in final form at https://doi.org/10.1111/jace.15048. 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: ultra-high temperature ceramic, strength, spark plasma sintering, niobium diboride

Date published: 2017-07-10

Publisher: Wiley

Journal:

• Journal of the American Ceramic Society (ISSN: 15512916) vol. 100 issue. 11 p. 5295-5305

Funding:

• Japan Society for the Promotion of Science KAKENHI B 15H04163 (Grant-in-Aid for Scientific Research B (No.15H04163) from JSPS)

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5501

First published URL: https://doi.org/10.1111/jace.15048

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Updated at: 2025-05-26 09:07:18 +0900

Published on MDR: 2025-05-26 12:23:51 +0900