▎ 摘　　要

NOVELTY - Preparing graphene/copper-niobium of multi-core composite wire comprises e.g. mixing copper and niobium powder uniformly and carrying out high energy ball milling to obtain fine powder, adding fine powder into first oxygen-free copper tube, sealing two ends of first oxygen-free copper tube and loading fine powder in tube, first multi-pass drawing of complex obtained in pipe and performing heat treatment, subjecting heat-treated tube complex for second drawing to obtain single core composite wire, molding single-core compound wire comprising 7-core composite wire using bundle drawing method. USE - The method is useful for preparing graphene/copper-niobium of multi-core composite wire (claimed). ADVANTAGE - The method improves strength and electrical conductivity of the wire. DETAILED DESCRIPTION - Preparing graphene/copper-niobium of multi-core composite wire comprises (i) mixing copper and niobium powder uniformly and carrying out high energy ball milling to obtain fine powder, where ratio of copper and niobium powder is 1:1 and purity of niobium powder is 99.99%; (ii) adding fine powder obtained in step (i) into first oxygen-free copper tube, sealing two ends of first oxygen-free copper tube and loading 10-60% fine powder in tube; (iii) first multi-pass drawing of complex obtained in the pipe in step (ii) and performing heat treatment and first drawing pass processing rate of less than 10%; (iv) subjecting heat-treated tube complex obtained in step (iii) for second drawing to obtain single core composite wire and second drawing pass processing rate is less than 15%; (v) molding single-core compound wire obtained in step (iv) comprising 7-core composite wire, first composite molding using bundle drawing method and process of bundle drawing method comprises (v.a) sizing single-core compound wire, cutting, straightening and performing acid cleaning process; (v.b) taking acid-treated single-core compound wire bundle obtained in step (v.a) and assembling in second oxygen free copper tube and performing heat treatment to obtain copper compound; (v.c) drawing copper complex obtained in step (v.b) many times to obtain third drawing core composite wire, where pass processing rate of third drawing is less than 21%; (vi) molding composite wire obtained in step (v) for secondary composite molding, preparing 72-core composite wire, using second compound molding and drawing same cluster of step (v); (vii) molding obtained 72-core composite wire composite in step (vi) for three times to obtain 73 core composite wire, forming bundle-drawing of the triple composite same as step (v); (viii) taking 73-core compound wire into graphene/copper-niobium composite wire obtained in the step (vii). The method comprises (viii.a) melting graphene solution uniformly and coating on the outer wall of the niobium tube, solidifying to obtain graphene-niobium pipe, where graphite-graphene thickness of niobium tube outer wall is less than 1mm; (viii.b) inserting 73-core compound wire into graphene-niobium pipe to obtain composite tube body; (viii) introducing composite pipe body obtained in step (viii.b) into third oxygen-free copper, performing heat treatment and multi-pass fourth drawing to obtain graphene/copper-niobium composite wire and fourth drawing pass processing efficiency is less than 15%; (ix) taking graphite/copper-niobium composite wire obtained in step (viii) into multicore graphene/copper-niobium composite wire, where process comprises (ix.a) cutting graphite/copper-niobium composite wire, straightening, acid cleaning and drying; (ix.b) taking 19 dry-processed graphene/copper-niobium composite wires obtained in step (ix.a), loading into fourth oxygen-free copper tube, filling gap between graphene/copper-niobium composite wire and sealing ends of the fourth oxygen-free copper vacuum electron beam; and (ix.c) subjecting fourth oxygen-free copper vacuum electron beam for welding after processing hot extrusion and multipass fifth drawing, where pass processing rate of fifth drawing is less than 12%.