▎ 摘　　要

NOVELTY - Production of graphene composite aluminum alloy involves cleaning the surface of annealed aluminum alloy mixed particles, drying, mixing dried aluminum alloy mixed particles with graphene powder, stirring, compacting, sealing, pressing, and rolling obtained preform. The aluminum alloy mixed particles are prepared by baking potassium-titanium fluoride powder, grinding, obtaining powder, adding aluminum alloy to a crucible, melting, adding powder additive, reacting, processing reaction system in a low-frequency rotating magnetic field, refining, and ball-milling. USE - Production of graphene composite aluminum alloy (claimed). ADVANTAGE - The method enables production of graphene composite aluminum alloy with high density, strength, toughness and wear resistance. DETAILED DESCRIPTION - Production of graphene composite aluminum alloy involves annealing aluminum alloy mixed particles, cleaning the surface of annealed aluminum alloy mixed particles with lye and water, respectively, drying, uniformly mixing dried aluminum alloy mixed particles with graphene powder at a predetermined ratio, uniformly stirring, compacting, sealing, pressing, and rolling obtained preform. The content of aluminum alloy mixed particles is 2.5-6 %mass or 2-8 vol.%. The aluminum alloy mixed particles are prepared by baking potassium-titanium fluoride powder at 450 degrees C for 3 hours, removing crystal water, cooling, grinding, screening, obtaining powder additive with particle size of 300 mu m or less, adding 7-series aluminum alloy to a crucible, melting at high temperature, adding powder additive to molten aluminum alloy, introducing an ammonia-containing inert gas at 50-150 ml/minute, performing in-situ reaction at 1000-1100 degrees C, processing reaction system in a low-frequency rotating magnetic field at frequency of 5 Hz and excitation current of 100 A for 5-10 minutes, refining treated molten metal, aging at 650-750 degrees C for 5-15 minutes, and ball-milling. The content of ammonia in ammonia-containing inert gas is 30-40 vol.%. The graphene powder is prepared by adding graphite having purity of more than 99% and particle size of 100-300 mu m, and stripping liquid to a reactor provided with a stirrer, stirring at 1500 rpm and 90 degrees C for 3 hours under pressure of 3 atmosphere, discharging upper suspension into a storage tank through a discharge port, aging for more than 24 hours, conveying graphene suspension in the storage tank into a centrifuge, centrifuging at 1500 rpm for 1 hour, removing supernatant, vacuum-filtering, washing filter cake with predetermined amount of distilled water, and freeze-drying for more than 4 hours. The composition of stripping liquid comprises 90 pts. wt. ethylene glycol, 40 pts. wt. polyacrylate, 1 pt. wt. silica/poly(methyl methacrylate-styrene) double-shell composite microspheres and 1 pt. wt. lithium chloride. The particle size of silica/poly(methyl methacrylate-styrene) double-shell composite microspheres is 50 microns or less. Silica core has particle size of 20 nm or more and shell thickness of 10 nm or more. The number average molecular weight of polyacrylate is more than 100000. The weight ratio of graphite and stripping liquid is 1:3.