Preparation and Properties of Layered SiC-Graphene Composites for EDM

0543429 - ÚFM 2022 RIV CH eng J - Journal Article
Hanzel, O. - Lenčéš, Z. - Tatarko, P. - Sedlák, R. - Dlouhý, Ivo - Dusza, J. - Šajgalík, P.
Preparation and Properties of Layered SiC-Graphene Composites for EDM.
Materials. Roč. 14, č. 11 (2021), č. článku 2916. E-ISSN 1996-1944
Grant - others:AV ČR(CZ) SAV-18-12; AV ČR(CZ) SAV-21-04
Program: Bilaterální spolupráce; Bilaterální spolupráce
Institutional support: RVO:68081723
Keywords : silicon-carbide ceramics * thermal-conductivity * grain-growth * oxide * gnps * additives * toughness * go * SiC * graphene * layered composites * electrical conductivity * scratch tests
OECD category: Ceramics
Impact factor: 3.748, year: 2021
Method of publishing: Open access
https://www.mdpi.com/1996-1944/14/11/2916

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.
Permanent Link: http://hdl.handle.net/11104/0320636