Superconducting wire component and preparation method thereof

Abstract

The invention relates to a bismuth-series high-temperature superconducting wire component and a preparation method thereof. The superconducting wire component comprises at least two single superconducting wires with superconductivity, the width surfaces among the single superconducting wires are parallelly connected together in an electrical contact manner, and at least one metal reinforcing band is parallelly connected on the outer width surface of each of the two outermost superconducting wires in parallel connection. In order to further improve mechanical strength of the superconducting wire component, at least one metal coating with the mechanical strength higher than that of single metal reinforcing band is coated on the outer surface of the superconducting wire component. The superconducting wire component prepared by the method is high in mechanical strength and critical current.

Description

technical field [0001] The invention relates to a superconducting wire assembly, in particular to a high-temperature superconducting wire assembly prepared by using a bismuth-based high-temperature superconducting material and a metal reinforcing tape and a preparation method thereof. Background technique [0002] Bismuth-based high-temperature superconducting tape is currently the only high-temperature superconducting material that can be produced on a large scale. Superconducting cables, superconducting motors, superconducting current limiters, and superconducting magnetic separators made of bismuth-based high-temperature superconducting tapes are used. Major breakthroughs have been made in the research and development of products such as superconducting maglev trains and superconducting energy storage systems, and many projects have entered the stage of prototype trial operation. Bismuth-based high-temperature superconducting strips are made by Powder-In-Tube (PIT) method...

AI Technical Summary

Problems solved by technology

[0003] During the application of bismuth-based high-temperature superconducting materials, if a certain part of the wire is bent or broken, one or more superconducting cores here will lose their current-carrying capacity, while the remaining cores of the wire will lose their current carrying capacity. If the total current exceeds the current carrying capacity of these cores, the excess part will be shunted by the silver or silver alloy matrix, but the silver or silver alloy matrix may not be able to withstand the large shunt current in the wire. Cause the wire jacket to burn, thereby disconnecting the wire, or even catching fire, endangering the entire superconducting device

In addition, the critical current (Ic) of a single bismuth-based superconducting tape at 77K is already very high, but it is still difficult to meet the requirements of some large superconducting devices, such as large superconducting transformers, superconducting motors, superconducting cables, Superconducting energy storage devices and current leads, etc. These superconducting devices usually need to pass a large current, and the current value is greater than the critical current of a single superconducting strip

The Chinese patent with application number 200510070732.9 provides a superconducting wire assembly, which connects multiple superconducting wires together, and wraps the outer surface with at least one layer of metal coating whose mechanical strength is higher than that of a single superconducting wire , although this component can improve the current and mechanical strength, it still cannot meet the requirements of some large superconducting devices

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