Anisotropy of functional properties of SiC composites with GNPs,GO and in-situ formed graphene |
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| Affiliation: | 1. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravska cesta 9, 845 36, Bratislava, Slovak Republic;2. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 040 01, Ko?ice, Slovak Republic;3. Pavol Jozef ?afárik University in Ko?ice, Faculty of Science, Institute of Physics,Park Angelinum 9, 040 01, Ko?ice, Slovak Republic;1. Institute of Inorganic Chemistry, Slovak Academy of Science, Dúbravská cesta 9, 845 36 Bratislava, Slovakia;2. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 043 53 Ko?ice, Slovakia;3. Alexander Dub?ek University of Tren?ín, and RONA, j.s.c, ?tudentská 2, 911 50 Tren?ín, Slovakia;1. Institute of Inorganic Chemistry, Slovak Academy of Science, Dúbravská cesta 9, 842 36 Bratislava, Slovakia;2. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04353 Ko?ice, Slovakia;3. Alexander Dub?ek University of Tren?ín, and RONA, j.s.c, ?tudentská 2, 911 50 Tren?ín, Slovakia;1. Materials Science and Engineering, Indian Institute of Technology Patna, Bihta-Kanpa Road, Bihta, Patna, Bihar, 801 103, India;2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600 036, India;3. Centre for Nanoscience and Technology, Madanjeet School of Green Energy Technologies, Pondicherry University, Puducherry, 605014, India;1. Bulent Ecevit University, Incivez, 67100 Zonguldak, Turkey;2. Institute of Ceramics and Glass (ICV), CSIC, Kelsen 5, 28049 Madrid, Spain;3. Nanotechnology Research Division, Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, 3810-193, Aveiro, Portugal;1. Institute of Materials Research, Slovak Academy of Sciences, Division of Ceramic and Non-Metallic Systems, Watsonova 47, 040 01 Ko?ice, Slovak Republic;2. Pavol Jozef ?afárik University in Ko?ice, Faculty of Science, Institute of Physics, Department of Condensed Matter Physics, Park Angelinum 9, 040 01 Ko?ice, Slovak Republic;3. AGH University of Science and Technology in Krakow, Faculty of Materials Science and Ceramics, Department of Ceramics and Refractories, al. A. Mickiewicza 30, 30-059 Krakow, Poland;4. Centre for Materials Research and Sintering Technology, Institute of Advanced Manufacturing Technology, Krakow, 30–011, Poland;5. Donát Bánki Faculty of Mechanical and Safety Engineering, Óbuda University, Népszínház utca 8, 1081 Budapest, Hungary |
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| Abstract: | This paper reports on anisotropy of functional properties of different silicon carbide-graphene composites due to preferential orientation of graphene layers during sintering. Dense silicon carbide/graphene nanoplatelets (SiC/GNPs) and silicon carbide/graphene oxide (SiC/GO) composites were sintered in the presence of yttria (Y2O3) and alumina (Al2O3) sintering additives at 1800 °C in vacuum by the rapid hot pressing (RHP) technique. It is found that electrical conductivity of SiC/GNPs and SiC/GO composites increases significantly in the perpendicular direction to the RHP pressing axis, reached up to 1775 S/m in the case of SiC/GO (for 3.15 wt.% of rGO). Also, thermal diffusivity was found to increase slightly by the addition of GNPs in the SiC/GNPs composites in the perpendicular direction to the RHP pressing axis. But, in the parallel direction, the addition of GNPs showed a negative effect. The formation of graphene domains was observed in reference sample SiC-Y2O3-Al2O3 sintered by RHP, without any addition of graphene. Their presence was confirmed indirectly by increasing electrical conductivity about three orders of magnitude in comparison to the reference sample sintered by conventional hot press (HP). Raman, SEM and TEM analysis were used for direct evidence of presence of graphene domains in RHP reference sample. |
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| Keywords: | Graphene nanoplatelets Graphene oxide Silicon carbide Functional properties Anisotropy |
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