▎ 摘　　要

NOVELTY - The preparation method of nylon/graphene/carbon fiber composite powder involves mixing graphene, surfactant and organic solvent (A) to obtain modified graphene dispersion liquid, mixing nylon, selectively adding anti-sticking agent and organic solvent (B) to obtain mixed solution, mixing with modified graphene dispersion liquid and silane coupling agent, adding the mixture to a high-pressure reactor, heating, decompressing, cooling, and post-treating to obtain nylon/graphene composite powder, and stirring nylon/graphene composite powder, carbon fiber, flow aid and antioxidant. USE - Preparation method of nylon/graphene/carbon fiber composite powder used for selective laser sintering (claimed). ADVANTAGE - The method enables preparation of nylon/graphene/carbon fiber composite powder with excellent electrical conductivity, thermal conductivity and mechanical property. DETAILED DESCRIPTION - The preparation method of nylon/graphene/carbon fiber composite powder involves (1) mixing graphene, surfactant and organic solvent (A) to obtain modified graphene dispersion liquid, (2) mixing nylon, selectively adding anti-sticking agent and organic solvent (B) to obtain mixed solution, (3) mixing the mixed solution, the modified graphene dispersion liquid and silane coupling agent, adding the mixture to a high-pressure reactor, heating and reacting, decompressing, cooling to room temperature, and post-treating to obtain nylon/graphene composite powder, and (4) uniformly stirring nylon/graphene composite powder prepared in the step (3), carbon fiber, flow aid and antioxidant. An INDEPENDENT CLAIM is included for selective laser sintering method, which involves loading nylon/graphene/carbon fiber composite powder into a powder chamber of a selective laser molding machine, uniformly paving the raw material powder on a processing platform using a powder scraper, heating at processing temperature, emitting laser, controlling the laser scanning on the processing platform according to the two-dimensional slice by the control program, moving down one powder layer thickness after the scanning of laser beam is completed, using scraper for spreading, laser beam scanning and repeating to obtain laser sintered component, where the scanning method of the laser beam is from the inside to the outside, the laser power is 20-70 W, the scanning speed is 4 m/second, the thickness of the powder layer is 0.08-0.15 mm, and the processing temperature is 165-180 degrees C.