METHOD FOR MANUFACTURING A SUPERCONDUCTING COMPOSITE WIRE BASED ON NB3SN

The invention relates to the field of electrical engineering and the creation of long composite wires based on superconducting compounds for use in the manufacture of electrical equipment. Claimed is a method for manufacturing an Nb3Sn-based superconducting wire which includes forming a first titanium- and/or tantalum-doped multi-filament blank by placing a diffusion barrier and a copper matrix in a copper jacket, said copper matrix having a tin-containing rod at its centre and niobium-containing rods arranged therearound, each of which has a copper-containing cladding, deforming said blank until a composite rod of the desired size is formed, cutting same into measured parts, forming a second multi-filament blank from the resulting measured parts by assembling same in a metal jacket, deforming the second multi-filament blank by drawing same to form a wire having a diameter of from 2 to 0.2 mm, and subsequently heat treating said wire in stages, where the second stage of heat treatment is carried out at a temperature of 620-750°C for from 24 to 400 hours, and the first stage of heat treatment is carried out at a temperature of 410-500°C for 5-200 hours.