Method for manufacturing NbTi-CuNi-Cu superconductive composite wire rod

Abstract

The invention discloses a method for manufacturing an NbTi-CuNi-Cu superconductive composite wire rod. The method comprises the following steps of putting an NbTi alloy rod into a Cu tube, and obtaining an NbTi-Cu single-core composite rod blank through a hot extrusion or sleeve extension method; extending the NbTi-Cu single-core composite rod blank to a hexagonal rod to obtain an NbTi-Cu single-core composite rod, putting the NbTi-Cu single-core composite rod into a copper tube to manufacture an NbTi-Cu multi-core composite rod; putting the NbTi-Cu single-core composite rod or the NbTi-Cu multi-core composite rod into a copper tube, sleeving a CuNi tube with the copper tube, sleeving another copper tube with the CuNi tube, and sealing two ends of the copper tube; reducing space in the copper tube through a hot isostatic pressure method and performing hot extrusion to obtain an NbTi-CuNi-Cu composite rod; performing multiple cold extension and aging treatment on the NbTi-CuNi-Cu composite rod to obtain the superconductive composite wire rod with the required dimension and shape. By means of the method, alternating current loss of the NbTi superconductive composite wire rod is reduced, production processes are simplified, and production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of superconducting wire preparation technology, and in particular relates to a preparation method of NbTi-CuNi-Cu superconducting composite wire. Background technique [0002] NbTi superconducting wire is currently the most widely used low-temperature superconducting material, and is widely used in the manufacture of superconducting magnets, nuclear magnetic resonance instruments, large particle accelerators, magnetically confined controllable nuclear fusion devices and other fields. In order to reduce the AC loss of the NbTi superconducting composite wire in the alternating magnetic field and reduce the electromagnetic coupling effect of the wire core wire, it is necessary to increase the contact resistance between the wires. CuNi alloys are often used to directly replace pure Cu as the matrix material or in pure Cu. A layer of pure Ni coating is processed outside the superconducting composite wire of the s...

AI Technical Summary

Problems solved by technology

Although CuNi alloy has a relatively high resistivity, its cold workability is poor, and its work hardening is relatively serious. It is not suitable for cold drawing processing with large deformation. It needs to reduce the amount of processing in passes, and the production efficiency is low. In order to eliminate work hardening, the production cycle is increased; while the cost of Ni plating is high, and a good coating generally only reaches a few microns, the subsequent conductor preparation and magnet winding process are easy to damage the coating, and the superconducting wire needs to be Ni The coating is removed by chemical method, but the Cu matrix material cannot be damaged, the process operation is cumbersome, and the electroplating production process also has environmental pollution problems

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