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Preparation and Properties of Layered SiC-Graphene Composites for EDM
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SYSNO ASEP 0543429 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Preparation and Properties of Layered SiC-Graphene Composites for EDM Author(s) Hanzel, O. (SK)
Lenčéš, Z. (SK)
Tatarko, P. (SK)
Sedlák, R. (SK)
Dlouhý, Ivo (UFM-A) RID, ORCID
Dusza, J. (SK)
Šajgalík, P. (SK)Number of authors 7 Article number 2916 Source Title Materials. - : MDPI
Roč. 14, č. 11 (2021)Number of pages 14 s. Language eng - English Country CH - Switzerland Keywords silicon-carbide ceramics ; thermal-conductivity ; grain-growth ; oxide ; gnps ; additives ; toughness ; go ; SiC ; graphene ; layered composites ; electrical conductivity ; scratch tests Subject RIV JH - Ceramics, Fire-Resistant Materials and Glass OECD category Ceramics Method of publishing Open access Institutional support UFM-A - RVO:68081723 UT WOS 000660279600001 EID SCOPUS 85107352106 DOI 10.3390/ma14112916 Annotation Three and five-layered silicon carbide-based composites containing 0, 5, and 15 wt.% of graphene nanoplatelets (GNPs) were prepared with the aim to obtain a sufficiently high electrical conductivity in the surface layer suitable for electric discharge machining (EDM). The layer sequence in the asymmetric three-layered composites was SiC/SiC-5GNPs/SiC-15GNPs, while in the symmetric five-layered composite, the order of layers was SiC-15GNPs/SiC-5GNPs/SiC/SiC-5GNPs/SiC-15GNPs. The layered samples were prepared by rapid hot-pressing (RHP) applying various pressures, and it was shown that for the preparation of dense 3- or 5-layered SiC/GNPs composites, at least 30 MPa of the applied load was required during sintering. The electrical conductivity of 3-layered and 5-layered composites increased significantly with increasing sintering pressure when measured on the SiC surface layer containing 15 wt.% of GNPs. The increasing GNPs content had a positive influence on the electrical conductivity of individual layers, while their instrumented hardness and elastic modulus decreased. The scratch tests confirmed that the materials consisted of well-defined layers with straight interfaces without any delamination, which suggests good adhesion between the individual layers. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2022 Electronic address https://www.mdpi.com/1996-1944/14/11/2916
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