▎ 摘　　要

NOVELTY - Preparing graphene-based thermally conductive/conductive composite material, comprises (i) pressing open-cell metal foam laminations with three-dimensional connected structure, (ii) heating the cavity of annealing furnace, (iii) adding compressed metal foam substrate to annealing furnace cavity, passing reducing gas, taking out the metal foam substrate, and annealing, (iv) heating the chamber of the reaction furnace, (v) adding mixed atmosphere of carbon source gas, reducing gas and carrier gas into the reaction furnace cavity, annealing, and catalyzing graphene on the surface of the metal foam substrate, (vi) cooling the metal foam substrate, and taking out to obtain graphene foamed network skeleton structure with close-packed structure grown on the metal foam substrate, (vii) removing foamed metal substrate to obtain foamed graphene with close-packed structure, and (viii) filling the polymer substrate in the pores of the foamed graphene network skeleton with close-packed structure. USE - The graphene-based composite material is useful in the fields of heat conduction, electric conduction, and electromagnetic shielding. ADVANTAGE - The graphene-based composite material has excellent thermal and electrical conductivity; has simple process and low production cost. DETAILED DESCRIPTION - Preparing graphene-based thermally conductive/conductive composite material, comprises (i) pressing open-cell metal foam laminations with three-dimensional connected structure, the compression rate is 90-99%, (ii) heating the cavity of annealing furnace to set temperature at 1000-1800 ℃ under carrier gas protective atmosphere, (iii) adding the compressed metal foam substrate into constant temperature zone of the annealing furnace cavity, introducing reducing gas, warming for 0-60 minutes, cooling it under carrier gas protective atmosphere, taking out the metal foam substrate, and annealing the pressed metal foam, (iv) heating the chamber of the reaction furnace to set temperature at 600-1200 ℃ under carrier gas protective atmosphere, (v) adding mixed atmosphere of carbon source gas, reducing gas and carrier gas into the reaction furnace cavity, annealing, and catalyzing graphene on the surface of the metal foam substrate, where the flow ratio between carbon source gas, reducing gas and carrier gas in the mixed atmosphere is 1:0-80:0-100, and the reaction time is 1-120 minutes, (vi) cooling the metal foam substrate under carrier gas protective atmosphere, and taking out to obtain graphene foam network skeleton structure with close-packed structure grown on the metal foam substrate, (vii) removing the foamed metal substrate using metal etching liquid to obtain foamed graphene with close-packed structure, and (viii) filling the polymer substrate in the pores of the foamed graphene network skeleton with a close-packed structure by vacuum impregnation process and complete curing.