Method for improving deformation uniformity of core wires of NbTi/Cu superconducting wire

Abstract

The invention provides a method for improving the deformation uniformity of core wires of a NbTi / Cu superconducting wire. The method comprises the steps of stretching and cutting off a NbTi / Cu single-core rod to obtain NbTi / Cu single-core round rods; processing a copper sheath and upper and lower convers with matched sizes; stretching out a copper inserting rod and carrying out cutting and straightening to obtain a plurality of inserting rods; tightly arranging a plurality of NbTi / Cu single-core round rods into the copper sheath, filling the parts between the adjacent single-core round rods with the copper inserting rods, also filling the parts between the single-core round rods and the copper sheath with the copper inserting rods and sealing and welding the copper sheath and the upper andlower covers to obtain a NbTi / Cu composite sheath; and finally carrying out extrusion, repetitive stretching and multi-aging heat treatment to obtain the NbTi / Cu superconducting wire with high-uniformity core wires. The superconducting wire prepared through the method is uniform in shape and consistent in properties, such as a head-to-tail copper ratio, an n value and critical current, and has relatively high uniformity.

Description

technical field [0001] The invention belongs to the technical field of processing methods for superconducting wires, and in particular relates to a method for improving the deformation uniformity of the core filaments of NbTi / Cu superconducting wires. Background technique [0002] The uniformity of deformation of the core wire inside the NbTi / Cu superconducting wire is one of the most important parameters for evaluating the stability of the superconducting wire. The uniformity of the core wire deformation has the following influences on the superconducting wire: (1) The uniformity of the core wire deformation determines the n value of the wire, that is, the worse the uniformity, the lower the n value, and the wire changes from the normal state to the superconducting state. There is a "climbing" phenomenon during the transformation process; the better the uniformity, the higher the n value, and the faster the wire transitions from the normal state to the superconducting state...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for improving the uniformity of deformation of the core wire of NbTi / Cu superconducting wire, which solves the problem of uneven deformation of the core wire of the existing NbTi / Cu superconducting wire

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