단순 2단계 공정으로 합성한 그래핀 강화 CuNi 복합재료
Graphene Reinforced CuNi Composite Fabricated by a Simple Two-step Process
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In this work, a three-dimensionally interconnected network of graphene-reinforced CuNi(3DiGr-CuNi) composite was fabricated by a simple two-step process in which Cu and Ni powderswere compacted into a disk by applying an appropriate compaction pressure, followed bychemical vapor deposition. By using various characterization tools such as optical microscopy,scanning electron microscopy, and X-ray diffraction analysis, it was found that there are certainoptimum conditions for producing a three-dimensionally interconnected network of graphene(3DiGr) in a CuNi matrix. It was also shown that a slightly modified surface of thethree-dimensionally reinforced composite can be used as a cathode in fuel cells. In addition, itwas found that the thermal conductivity of the 3DiGr-CuNi composite was ~58% higher than thatof PM CuNi alloy (without reinforcement), which can be explained by the ability of 3DiGr toprovide conducting channels for electron mobility. Moreover, the 3DiGr-CuNi composite showedlower corrosion current density and negative potential during a potentiodynamic polarizationexperiment, indicating better corrosion resistance than PM CuNi alloy. Uniaxial tensile testsshowed 14.8% and 14.5% higher yield and tensile strengths, respectively, of the 3DiGr-CuNicomposite compared with PM CuNi alloy.
Abstract
In this work, a three-dimensionally interconnected network of graphene-reinforced CuNi(3DiGr-CuNi) composite was fabricated by a simple two-step process in which Cu and Ni powderswere compacted into a disk by applying an appropriate compaction pressure, followed bychemical vapor deposition. By using various characterization tools such as optical microscopy,scanning electron microscopy, and X-ray diffraction analysis, it was found that there are certainoptimum conditions for producing a three-dimensionally interconnected network of graphene(3DiGr) in a CuNi matrix. It was also shown that a slightly modified surface of thethree-dimensionally reinforced composite can be used as a cathode in fuel cells. In addition, itwas found that the thermal conductivity of the 3DiGr-CuNi composite was ~58% higher than thatof PM CuNi alloy (without reinforcement), which can be explained by the ability of 3DiGr toprovide conducting channels for electron mobility. Moreover, the 3DiGr-CuNi composite showedlower corrosion current density and negative potential during a potentiodynamic polarizationexperiment, indicating better corrosion resistance than PM CuNi alloy. Uniaxial tensile testsshowed 14.8% and 14.5% higher yield and tensile strengths, respectively, of the 3DiGr-CuNicomposite compared with PM CuNi alloy.
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