▎ 摘　　要

Currently, graphene is widely discussed among researchers due to its thermal flowability that can improve the properties of composite materials. This research used the addition of graphene in copper matrix with a combination of binders which are polyethylene glycol (PEG), polymethyl methacrylate (PMMA) and stearic acid. The use of graphene as a filler material in copper matrix is a new approach in enhancing the thermal conductivity of the product produced. However, the additions of graphene in copper matrix can produce uneven composite because of the agglomeration of graphene particles. Therefore, sonication and magnetic stirring methods during pre-mixing process were used to produce a uniform feedstock with a better dispersion of graphene with minimum agglomeration. Sonication process temperature was set at 55 degrees C with different sonication duration which is 30, 60 and 90 min. For the magnetic stirring process, the parameters are 55 degrees C for 21 h at different speeds such as 300, 350 and 400 rpm. Field Emission Scanning Electron Microscope (FESEM) and EDX Mapping were carried out to observe the dispersion of graphene in the copper graphene composites. It was found that, better results were obtained after sonication and magnetic stirring process conducted. The best dispersion with more uniform and homogeneous was obtained at 60 min sonication time and medium magnetic stirring speed at 350 rpm. Graphene particles were found less grouping and did not re-agglomerate. This homogeneous dispersion made the interface relationship between copper and graphene particles better and porosities for the fabrication of final parts reduced.