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Bulk titanium diboride – niobium diboride ceramic composites were consolidated by spark plasma sintering (SPS) at 1950 °C. SPS resulted in dense specimens with a density exceeding 98% of the theoretical density and a multimodal grain size ranging from 1 to 10 μm. During the SPS consolidation, the pressure was applied and released at 1950 °C and 1250 °C, respectively. This allowed obtaining a two-phase composite consisting of TiB2 and NbB2. For these ceramics composites, we evaluated the flexural strength and fracture toughness and room and elevated temperatures. Room temperature strength of thus produced bulks was between 300 and 330 MPa, at 1200 °C or 1600 °C an increase in strength up to 400 MPa was observed.
Microstructure after flexure at elevated temperatures revealed the appearance of the needle-shape subgrains of NbB2, an evidence for ongoing plastic deformation. TiB2–NbB2 composites had elastic loading – stress curves at 1600 °C, and at 1800 °C fractured in the plastic manner and strength was ranged from 300 to 450 MPa. These data were compared with a specimen where a (Ti,Nb)B2 solid solution was formed during SPS to explain the behavior of TiB2–NbB2 ceramic composites at elevated temperatures.

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  This is the peer reviewed version of the following article: Demirskyi D, Solodkyi I, Nishimura T, Vasylkiv OO. Fracture and property relationships in the double diboride ceramic composites by spark plasma sintering of TiB2 and NbB2. J Am Ceram Soc. 2019; 102: 4259–4271, which has been published in final form at https://doi.org/10.1111/jace.16276. 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, niobium / niobium compounds, composites, Field Assisted Sintering Technique (FAST)

Date published: 2019-01-14

Publisher: Wiley

Journal:

• Journal of the American Ceramic Society (ISSN: 15512916) vol. 102 issue. 7 p. 4259-4271

Funding:

• NIMS PA5180 (セラミックスプロセッシング)

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4965

First published URL: https://doi.org/10.1111/jace.16276

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Updated at: 2024-11-16 08:30:42 +0900

Published on MDR: 2024-11-16 08:30:42 +0900