Graphene reinforced aluminum matrix composite with high electrical conductivity and preparation method thereof

A preparation method of a graphene reinforced aluminum matrix composite, comprising:

• preparation of raw materials, comprising:
• drying graphene, aluminum powder and aluminum block in a drying oven to remove moisture;
• obtaining aluminum coated graphene powder by plating the aluminum powder on a surface of the graphene through electroless plating;
• melting the aluminum block into aluminum liquid in a crucible furnace and injecting first inert gas for protection;
• heating a forming device to a temperature lower than a melting point of aluminum;
• alternately pouring the aluminum liquid into a forming mold of the forming device to form an aluminum liquid solidification layer and laying a layer of the aluminum coated graphene powder on the aluminum liquid solidification layer to form an aluminum coated graphene powder layer until the forming mold is fully filled, thereby forming a sandwich structure with a first layer and a last layer both being the aluminum liquid solidification layers;
• extruding the sandwich structure into a rectangular test block by using a press;
• heating the rectangular test block to a temperature in a range of 500° C. to 600° C. in a heating furnace, keeping the heated rectangular test block in the heating furnace to maintain the temperature for a preset time, and performing forging treatment on the rectangular test block to obtain a forged rectangular test block;
• after cooling the forged rectangular test block to room temperature, performing longitudinal cold deformation on the forged rectangular test block to obtain a deformed rectangular test block;
• and
• performing annealing treatment on the deformed rectangular test block under a protection of second inert gas to obtain the graphene reinforced aluminum matrix composite.