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The main objective of this investigation is the consolidation and flexural strength of alpha silicon carbide ceramics produced without additives by spark plasma sintering. Using the design of the experiment method, we optimized temperature and dwell to achieve fully dense silicon carbide bulks. The consolidation process of silicon carbide was analyzed similarly to the creep of bulk ceramics, and it was determined that the activation energy for the densification process was 596±39 kJ/mol, while the stress exponent n was below 2. Bulk additive-free silicon carbide ceramics gradually increased flexural strength as the temperature rose to 2000 °C. The flexural strength at 2000 °C was influenced by the loading rate, and under 2.5 mm/min, it reached a maximum of 2.08 GPa. To explain this phenomenon, a deformation mechanisms map was created, indicating that diffusion creep is the most probable mechanism for the strain sensitivity of SiC at 2000 °C. Transmission electron microscopy indicated a substantial rise in twin density within the ⍺-SiC grains at 2000 °C, indicating the activation of a previously unreported self-reinforcing mechanism.

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  This is the peer reviewed version of the following article: Demirskyi D, Sepehri-Amin H, Vasylkiv OO. High-temperature deformation and consolidation of polycrystalline α-SiC by spark plasma sintering. Int J Appl Ceram Technol. 2024;e14967, which has been published in final form at https://doi.org/10.1111/ijac.14967. 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: Polycrystalline ⍺-SiC, High temperature deformation, spark plasma sintering, microstructure

Date published: 2024-10-22

Publisher: Wiley

Journal:

• International Journal of Applied Ceramic Technology (ISSN: 1546542X)

Funding:

• NIMS AB3080 (多結晶光学材料 Research toward Innovative Optical Materials)
• JSPS KCB101 (非晶質相形成による超高温セラミックスの高)

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4950

First published URL: https://doi.org/10.1111/ijac.14967

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Updated at: 2025-10-23 08:30:26 +0900

Published on MDR: 2025-10-23 08:18:20 +0900