▎ 摘　　要

NOVELTY - Preparing foam copper-graphene-expanded graphite-graphite composite heat dissipation material, involves pretreating foamy copper, and loading modified graphene oxide on the surface of the pretreated foamy copper to obtain surface-loaded modified graphene oxide foamy copper. The graphite powder and expanded graphite powder are fully mixed to obtain mixed powder. The mixed powder is filled into the internal pores of the surface-loaded modified graphene oxide foam copper to obtain a composite heat dissipation material precursor. The composite heat dissipation material precursor is pressed and molded in a cold pressing mode to obtain a composite heat dissipation material prefabricated block. The heat treatment is carried out on the composite heat dissipation material prefabricated block to obtain a composite heat dissipation intermediate material. The secondary cold pressing is carried out on the composite heat dissipation intermediate material to obtain target product. USE - Method for preparing foam copper-graphene-expanded graphite-graphite composite heat dissipation material. ADVANTAGE - The method enables to prepare composite heat dissipation material, which has in-plane heat conductivity coefficient of 720-800 W/(m.K) and vertical in-plane heat conductivity coefficient of 350-400 W/(m.K). Thecomposite heat dissipation material meets the heat dissipation performance required by application, and also meets the strength and friction performance required by equipment. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a foamed copper-graphene-expanded graphite-graphite composite heat-dissipating material, which has mass fraction of copper in the composite heat dissipation material is 30-40 wt.%. The in-plane thermal conductivity of the composite heat dissipation material is 720-800W/(m.K), the in-plane thermal conductivity is 350-400W/(m.K), and the density is 5-6 g/cm3, the bending strength is 25-30 MPa.