Method for preparing aluminum carbon composite by using foam aluminum

A method for preparing an aluminum carbon composite by using foam aluminum, wherein the method comprises the following steps:

• step 1, preparing raw materials:
• pickling a carbon material in dilute acid;
• ultrasonic cleaning the foam aluminum in anhydrous ethanol;
• drying an aluminum block, a slag remover, and a refining agent used for smelting;
• step 2, performing electromagnetic stirring on a target proportion of the foam aluminum and the carbon material in the anhydrous ethanol;
• step 3, drying the stirred foam aluminum to obtain a foam aluminum preform adsorbed with the carbon material;
• step 4, melting the aluminum block into initial aluminum liquid in a crucible furnace and introducing inert gas for protection;
• step 5, adding the slag remover and the refining agent into the initial aluminum liquid successively for smelting to obtain aluminum liquid;
• step 6, reducing temperature of the aluminum liquid to a range of 620° C. to 650° C. and keeping the temperature for a target time to make the aluminum liquid become a semi-solid state;
• step 7, adding the foam aluminum preform, pressing the foam aluminum preform into the aluminum liquid, and at the same time stirring to obtain foam aluminum carbon aluminum liquid;
• step 8, heating a forming device to a preset temperature;
• and
• step 9, pouring the foam aluminum carbon aluminum liquid obtained in step 7 into the forming device for extrusion molding, thereby obtaining the aluminum carbon composite prepared by using the foam aluminum;
• wherein in step 1, a mass fraction of aluminum in each of the aluminum block and the foam aluminum is no less than 99.6%;
• the foam aluminum comprises foam aluminum with through-holes, a porosity ratio of the foam aluminum is no less than 85%, a pore diameter of the foam aluminum is no greater than 1 micrometer (μm), the foam aluminum is processed into fragments, with volume no greater than 1 cubic millimeter (mm3);
• the carbon material is one of graphite and graphene, the carbon material is a nanoscale carbon material;
• the dilute acid is one of hydrochloric acid and nitric acid;
• and
• the slag remover is a chloride salt, and the refining agent is a sodium salt;
• wherein in step 2, a mass ratio of the foam aluminum to the carbon material is 1:3 to 1:5, and the stirring is performed in alternating clockwise and counterclockwise cycles, and a stirring time is in a range of 3 h to 6 h.