▎ 摘　　要

NOVELTY - In-line preparation method of three-dimensional graphene-coated spherical copper composite material, involves (i) adding polymethylmethacrylate and steel ball into a ball mill, filling the vacuum with argon as a protective atmosphere, carrying out ball milling to obtain polymethylmethacrylate composite powder, and (ii) mixing polymethylmethacrylate composite powder and nano-copper powder and carrying out in-line chemical vapor reduction, carrying out decomposition of carbon atoms generated in polymethylmethacrylate to produce graphene on the copper surface. USE - In-line preparation method of three-dimensional graphene-coated spherical copper composite material used in electronic device. ADVANTAGE - The method achieves the strengthening of the copper base material, and achieves high-strength copper material in the application of electronic devices. DETAILED DESCRIPTION - In-line preparation method of three-dimensional graphene-coated spherical copper composite material, involves (i) adding polymethylmethacrylate and steel ball in the mass ratio of 1:10-20 into a ball mill, filling the vacuum with argon as a protective atmosphere, carrying out ball milling to obtain polymethylmethacrylate composite powder, and (ii) mixing the prepared polymethylmethacrylate composite powder and nano-copper powder into a tube furnace in a mass ratio of (0.1-0.3):10 and carrying out in-line chemical vapor reduction at a reduction temperature of 800 degrees C for 5-15 minutes using hydrogen as reducing atmosphere and argon as protective atmosphere where the flow ratio of hydrogen and argon is 1:2-2:1, carrying out decomposition of carbon atoms generated in polymethylmethacrylate to produce graphene on the copper surface, and obtaining in-line growth of three-dimensional graphene-coated copper composite.