▎ 摘　　要

NOVELTY - The method for preparing cobalt-plated cobalt-enhanced cobalt-based alloy composite powder on surface of graphene for selective laser melting and forming, involves (1) dissolving graphene in ethylene glycol solution and ultrasonically dispersing, adding cobalt(II) chloride hexahydrate to mixed solution, stirring, adding alkaline substances, adjusting pH value of solution to obtain graphene solution, (2) preparing 5-20 vol.% hydrated hydrazine aqueous solution, (3) heating graphene solution, and when temperature rises to 80-90degreesC, dripping hydrazine hydrate solution, (4) reacting for 2-3 hours, after reaction is finished, leaving still for precipitation, discarding supernatant liquid, washing with absolute ethanol to neutrality, filtering and drying to obtain cobalt-plated graphene powder, and (5) adding cobalt-plated graphene powder and cobalt-based alloy powder to ball milling tank, setting milling speed and milling time, and ball milling. USE - Method for preparing cobalt-plated cobalt-enhanced cobalt-based alloy composite powder on surface of graphene for selective laser melting and forming, used for surgical implant of medical application, dental material and joint prosthesis. ADVANTAGE - The method enables efficient and simple hydrothermal reduction process to uniformly load cobalt metal on the surface and interlayer surface of graphene to improve the interface bonding with the matrix, improves the dispersibility and wettability of graphene. The obtained cobalt-plated graphene is utilized as enhanced component and mechanically ball milled with cobalt-based alloy to achieve uniform mixing of cobalt-plated graphene and cobalt-based alloy powder, and the sample of cobalt-plated graphene/cobalt-based composite material is printed out by selective laser melting forming, and polishing the surface of the sample, cleaning after erosion treatment, and observing the outer surface of the erosion site with metallurgical microscope. The method improves the interface bonding strength of the graphene and the matrix, improves the dispersibility and wettability of graphene, and obtains graphene-reinforced cobalt-based alloy composite material with excellent performance. DETAILED DESCRIPTION - The method for preparing cobalt-plated cobalt-enhanced cobalt-based alloy composite powder on surface of graphene for selective laser melting and forming, involves (1) weighing 0.1-0.2 g graphene and dissolving in 30-60 mL ethylene glycol solution and ultrasonically dispersing, adding 0.5-1.0 g cobalt(II) chloride hexahydrate to mixed solution, stirring evenly, adding alkaline substances, adjusting pH value of solution to 9-10 to obtain graphene solution, (2) preparing 5-20 vol.% hydrated hydrazine aqueous solution, (3) heating graphene solution, and when temperature rises to 80-90degreesC, dripping hydrazine hydrate solution at rate of 2-3 drops per second, (4) after dripping, reacting for 2-3 hours, after reaction is finished, leaving still for precipitation, discarding supernatant liquid, washing with absolute ethanol to neutrality, filtering and drying to obtain cobalt-plated graphene powder, (5) adding cobalt-plated graphene powder and cobalt-based alloy powder to ball milling tank at weight ratio of 0.5-1:99-99.5, setting milling speed and milling time, and mixing by vacuum ball milling.