▎ 摘　　要

NOVELTY - The method comprises (1) uniformly mixing -320 mesh copper-aluminum powder and high-purity graphite powder with an average particle size of 2-4 microm, where the mass of aluminum in the copper-aluminum powder is 0.001-0.005 wt.%, and the mass ratio of high-purity graphite to copper-aluminum powder is 0.001-0.5%, (2) pressing the mixed powder into a billet by isostatic pressing, (3) sintering and thermally insulating under protective atmosphere or vacuum conditions, (4) carrying out hot extrusion of the sintered billet into a plate, (5) cold rolling the sheet, and carrying out annealing treatment, (6) cutting the plate into small sections, (7) pressing the blanked section into a billet, (8) sintering and keeping warm under protective atmosphere or vacuum conditions, (9) introducing the blank into a copper wrapping, vacuuming, and sealing, (10) peeling and hot extruding the sheath into a plate, and (11) repeating steps 5-10 as one cycle. USE - Method for preparing high-strength and high-conductivity graphene/copper-aluminum composite material, which is used in rail traffic, long-distance transmission industry. ADVANTAGE - The method: is easy to operate and has high efficiency; maintains the original physical properties of graphene. The composite material has a tensile strength greater than 450 MPa, and can maintain an electrical conductivity of more than 90% IACS. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for high-strength and high-conductivity graphene/copper-aluminum composite material.