Enhanced thermal diffusivity of copperbased composites using copper-RGO sheets |
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Authors: | Sangwoo Kim Hyouk-Chon Kwon Dohyung Lee Hyo-Soo Lee |
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Affiliation: | 1.Liqud processing and Casting R&D Group,Korea Institute of Industrial Technology,Incheon,Republic of Korea;2.Department of Mechanical Engineering,Hanyang University,Ansan,Republic of Korea |
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Abstract: | The synthesis of copper-reduced graphene oxide (RGO) sheets was investigated in order to control the agglutination of interfaces and develop a manufacturing process for copper-based composite materials based on spark plasma sintering. To this end, copper-GO (graphene oxide) composites were synthesized using a hydrothermal method, while the copper-reduced graphene oxide composites were made by hydrogen reduction. Graphene oxide-copper oxide was hydrothermally synthesized at 80 °C for 5 h, and then annealed at 800 °C for 5 h in argon and hydrazine rate 9:1 to obtain copper-RGO flakes. The morphology and structure of these copper-RGO sheets were characterized using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy. After vibratory mixing of the synthesized copper-RGO composites (0-2 wt%) with copper powder, they were sintered at 600 °C for 5 min under100 MPa of pressure by spark plasma sintering process. The thermal diffusivity of the resulting sintered composite was characterized by the laser flash method at 150 °C. |
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