▎ 摘　　要

NOVELTY - Preparing high-strength and high-conductivity graphene-reinforced copper-silver composite wire comprises e.g. (i) adding sodium silicate binder and ascorbic acid reducing agent to the graphene oxide aqueous solution, uniformly stirring, freezing, then drying in the air to obtain porous graphene colloid, (ii) melting copper-silver alloy in a vacuum induction furnace to obtain copper-silver alloy melt, adding the porous graphene colloid obtained in the step (i) to the bottom of the water-cooled copper mold of the vacuum induction furnace, pouring the copper-silver alloy melt into a water-cooled copper mold added with porous graphene colloid and cooling to obtain graphene-reinforced copper-silver alloy cylinder, (iii) hot-extruding the graphene-reinforced copper-silver alloy cylinder, and(iv) drawing the extruded composite rod obtained in the step (iii) to obtain composite core rod, and performing intermediate heat treatment during the drawing process. USE - The method is useful for preparing high-strength and high-conductivity graphene-reinforced copper-silver composite wire. ADVANTAGE - The method improves tensile strength and electrical conductivity of graphene-reinforced copper-silver composite wire. DETAILED DESCRIPTION - Preparing high-strength and high-conductivity graphene-reinforced copper-silver composite wire comprises (i) adding sodium silicate binder and ascorbic acid reducing agent to the graphene oxide aqueous solution, uniformly stirring, freezing, then drying in the air to obtain porous graphene colloid, (ii) melting copper-silver alloy in a vacuum induction furnace to obtain copper-silver alloy melt, adding the porous graphene colloid obtained in the step (i) to the bottom of the water-cooled copper mold of the vacuum induction furnace, pouring the copper-silver alloy melt into a water-cooled copper mold added with porous graphene colloid and cooling to obtain graphene-reinforced copper-silver alloy cylinder, (iii) hot-extruding the graphene-reinforced copper-silver alloy cylinder obtained in the step (ii) to obtain extruded composite rod, (iv) drawing the extruded composite rod obtained in the step (iii) to obtain composite core rod, and performing intermediate heat treatment during the drawing process, (v) cutting composite mandrel obtained in the step (iv) to length, straightening and cleaning, assembling multiple of washed composite mandrels into a copper tube, and vacuum-beam sealing and welding of both ends of the copper tube to obtain sheath body, sequentially hot-extruding the sheathing body and drawing to obtain graphene-reinforced copper-silver composite wire, performing intermediate heat treatment during the drawing process, where the graphene reinforced copper-silver composite wire has tensile strength greater than 980 MPa, and electrical conductivity is greater than 84.0% IACS.