▎ 摘　　要

NOVELTY - Graphene-metal composite multi-layer radiator comprises a metal base layer, a graphene film layer and a soldering part. The graphene film layer is uniformly deposited on surface of the metal substrate to form a graphene metal composite layer. The graphene metal composite layer is tightly wound into a round cake shape to form a spiral multi-layer composite structure in which metal base layer and the graphene film layer alternately overlap one other. The outermost graphene metal composite layer is welded to outer surface of the multi-layer composite structure to form a welded portion. USE - Graphene-metal composite multi-layer radiator. ADVANTAGE - The graphene-metal composite multi-layer radiator has high thermal conductivity, good heat-dissipating efficiency, simple technique, low cost, and is energy-saving and eco-friendly. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for producing graphene-metal composite multi-layer radiator, which involves: (A) preparing a graphene mixture with a concentration of 0.01-0.025mg/ml by using an anhydrous ethanol solution and graphene powder, and adding a metal salt in the mixture solution so that the concentration of the metal salt reaches 0.3-1.0mg/ml, and carrying out ultrasonic dispersion for 3-5 hours to obtain a uniform dispersion of graphene electrophoresis solution; (B) using strip of metal having a thickness of 0.05-1mm as metal substrate, immersing in 5-10% diluted nitric acid for 3 minutes to remove surface oxide, and rinsing with deionized water and subjecting ultrasonic cleaning with ethanol solution for 5 minutes, and then drying as a cathode; (C) using graphene sheet with the cathode as an anode, arranging cathode surface and anode surface to be parallel, keeping the distance between the cathode and the anode at 1-2cm, immersing cathode and anode in graphene electrophoresis solution and electrophoretically depositing at a direct current voltage of 80-160V for 1-6 minutes to obtain the graphene layer uniformly coated on the metal substrate with the graphene film layer product; (D) using steel nail as the shaft to take obtained product closely from one end into a multi-layered cylindrical shape, and fixing other end edge of the product to cylinder by laser welding to form a weld on the lateral surface of the body to obtain a sample; and (E) annealing obtained sample in a nitrogen atmosphere at a temperature of 200-300 degrees C for 1-3 hours, cooling and cutting into a circular cake shape perpendicular to the axial direction of cylinder to obtain final radiator.