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Influence of hexagonal boron nitride nanosheets on phase transformation, microstructure evolution and mechanical properties of Si3N4 ceramics
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SYSNO ASEP 0542944 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Influence of hexagonal boron nitride nanosheets on phase transformation, microstructure evolution and mechanical properties of Si3N4 ceramics Author(s) Tatarková, M. (SK)
Tatarko, P. (SK)
Kovalčíková, A. (SK)
Dlouhý, Ivo (UFM-A) RID, ORCID
Dusza, J. (SK)
Šajgalík, P. (SK)Number of authors 6 Source Title Journal of the European Ceramic Society. - : Elsevier - ISSN 0955-2219
Roč. 41, č. 10 (2021), s. 5115-5126Number of pages 17 s. Language eng - English Country GB - United Kingdom Keywords fracture-toughness ; fabrication ; composites ; nanocomposites ; nanotubes ; behavior ; Silicon nitride ; Boron nitride nanosheets ; Microstructure ; Toughening ; Mechanical properties Subject RIV JH - Ceramics, Fire-Resistant Materials and Glass OECD category Ceramics Method of publishing Limited access Institutional support UFM-A - RVO:68081723 UT WOS 000651914800004 EID SCOPUS 85102010027 DOI 10.1016/j.jeurceramsoc.2021.01.057 Annotation Fully dense Si3N4 materials with 1 wt.% (- 1.5 vol.%) and 2 wt.% (- 3.0 vol.%) h-BN nanosheets were prepared by spark plasma sintering at 1750 degrees C with the dwell of 7 min under a pressure of 50 MPa in a vacuum. BN nanosheets with different dimensions were prepared by ultrasound-assisted liquid phase exfoliation of h-BN powder, followed by centrifugation at different speeds (1000 rpm and 3000 rpm). The addition of BN nanosheets hindered the particle rearrangement stage of sintering, which resulted in the delayed alpha>beta phase transformation of Si3N4. To study a direct effect of BN nanosheets on the mechanical properties of Si3N4, the results were compared to the monolithic Si3N4 with similar grain size and alpha/beta-Si3N4 ratio. The addition of 2 wt.% h-BN nanosheets (1000 rpm) increased both the fracture toughness (- 26 %) and the strength (- 45 %) of Si3N4, when compared to the monolithic Si3N4 with similar microstructure. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2022 Electronic address https://www.sciencedirect.com/science/article/pii/S0955221921000972?via%3Dihub
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