▎ 摘　　要

NOVELTY - Graphene aluminum-based composite powder comprises few layers of graphene nanosheets and aluminum matrix powder in a ratio of 1:666-1999. The composite powder is prepared by uniformly dispersing few layers of lithocene nanosheets on the surface of the aluminum powder particles and carrying out thermal expansion-ultrasonic combined method. The graphene aluminum-based composite powder for laser deposition manufacturing has a sphericity of 0.85-0.9. USE - The composite powder is useful for laser deposition to manufacture graphene aluminum-based composite workpieces (claimed). ADVANTAGE - The composite workpiece: has excellent interface bonding, strong compactness, improved strength and toughness; and has no defects in pores. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing graphene aluminum-based composite powder, comprising (i) placing intercalated expandable graphite raw material at 500-800 degrees C for 1-5 minutes, taking out, cooling to room temperature to obtain graphene, adding the graphene to anhydrous ethanol in a ratio of 0.1-0.3 g:100-200 mu g/l, ultrasonicating for 2-5 hours to obtain few-layer graphene nanosheets, and (ii) mixing aluminum matrix powder and few-layer graphene nanosheets to obtain mixture, where the mass ratio between millimeter-level ball milling balls and aluminum matrix powder + few layers of graphene nanosheets is 3-5:1, the mass ratio between aluminum matrix powder and few-layer graphene nanosheets is 666-1999:1, then placing the mixture in a ball milling pot, adding anhydrous ethanol into the ball milling tank and wet ball milling, drying to obtain aluminum powder coated with few-layer graphene nanosheets, where the solid-to-liquid ratio between mixture and anhydrous ethanol is 500-800 g:120-200 ml; and (2) use of graphene aluminum-based composite powder for laser deposition manufacturing, comprising taking graphene aluminum-based composite powder as raw material for laser deposition manufacturing for additive manufacturing to prepare graphene aluminum-based composite workpieces.