Preparation method of MgB2-NbTi composite superconducting wire

Abstract

The invention provides a preparation method of a MgB2-NbTi composite superconducting wire. The preparation method comprises the following steps: A, preparing a MgB2 single-core wire; B, sizing, cutting and acid pickling a NbTi single-core wire and the MgB2 single-core wire; C, assembling the NbTi single-core wire, the MgB2 single-core wire and a Cu pipe to obtain a MgB2-NbTi tube composite body; D, adopting a machining route combining drawing and hole-pattern rolling, and carrying out the appropriate annealing treatment, thereby obtaining the MgB2-NbTi composite wire; E, carrying out the phase treatment and time-efficiency treatment, thereby obtaining the MgB2-NbTi composite superconducting wire. The MgB2 single-core wire is assembled with the NbTi single-core wire, a machining technology combining the drawing and hole-pattern rolling and a heat treatment technology are adopted, the MgB2-NbTi superconducting wire with excellent superconducting performance is finally prepared, and the preparation method is promising in application prospect.

Description

technical field [0001] The invention belongs to the technical field of superconducting wires, and in particular relates to a kind of MgB 2 -Preparation method of NbTi composite superconducting wire. Background technique [0002] Superconducting materials will be the most important high-tech energy-saving and environmentally friendly materials in this century, and will have a wide range of applications in large-scale power transmission and distribution, super magnets, energy storage, generators, transformers, maglev trains and other fields. "Climate warming" and the deterioration of human living environment bring many problems. [0003] Low-temperature superconductor NbTi alloy is the most widely used superconducting material. Because the manufacturing cost is lower than other low-temperature superconducting materials, and the mechanical properties are good, the technology is mature and the performance is stable, it is widely used. Many countries and regions in the world, i...

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Problems solved by technology

But MgB 2 Due to the inherent properties of the superconductor powder, its mechanical system energy is poor, and the quench phenomenon will occur under a small stress, and its critical current density is greatly affected by the magnetic field. At the same time, pure MgB 2 Superconductors lack effective pinning centers, and the critical current decays quickly under the influence of an external magnetic field. Therefore, effective pinning centers need to be introduced to improve their performance under magnetic fields, and chemical doping is an effective doping way, especially the C doping effect at the B site is the most obvious, and the dopant generally uses SiC, TiC and amorphous C, etc.

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