Conduction cooling type NbTi superconducting wire joint device and joint manufacturing method thereof

Abstract

The invention relates to a conduction cooling type NbTi superconducting wire connector device and a connector manufacturing method. A connector comprises an upper pressing plate, a lower pressing plate, an upper cover plate, a lower cover plate, a cold conduction plate, an insulating plate, a pre-tightening bolt, an insulating bolt, a superconducting wire and a superconducting wire connecting part. The invention discloses a manufacturing method of a conduction cooling NbTi superconducting wire joint. Corroding a copper substrate at the two ends of the superconducting wire for manufacturing the joint by using a FeCl3 solution to expose the NbTi filament; the filaments of the superconducting wires at the two ends needing to be connected are woven into a bundle; placing the connection part of the braided superconducting wire into a groove of a lower pressing plate, and adding low-temperature brazing filler metal; upper and lower pressing plates and upper and lower cover plates are placed on a heating table to be heated, so that the low-temperature brazing filler metal is thoroughly melted; covering the upper cover plate on the lower cover plate, and pre-tightening by using a pre-tightening screw; the manufactured connector device is placed and naturally cooled to the room temperature; and installing the insulating plate and the cold guide plate. The invention has the advantages of simple joint manufacturing process and equipment, stable and reliable structure and low joint resistance.

Description

technical field [0001] The invention belongs to the field of superconductivity, and mainly relates to a conductive cooling type NbTi superconducting wire joint device and a joint manufacturing method thereof. Background technique [0002] With the development of superconducting magnet technology, more and more magnetic fields in scientific research devices and facilities are generated by superconducting magnets. At present, low-temperature superconducting magnets in high-field magnetic field devices are mainly made of NbTi and Nb 3 Sn superconducting coil composition, compared with NbTi material, Nb 3 Although Sn has a high transition temperature, Nb 3 The manufacturing process of Sn superconducting coil is complicated, and heat treatment is required, and the ceramic phase formed after heat treatment has high hardness and high brittleness, which is easy to be formed in Nb 3 irreversible damage in Sn superconductors. Although the upper critical magnetic field of NbTi at 4....

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Problems solved by technology

[0002] With the development of superconducting magnet technology, more and more magnetic fields in scientific research devices and facilities are generated by superconducting magnets. At present, low-temperature superconducting magnets in high-field magnetic field devices are mainly made of NbTi and Nb 3 Sn superconducting coil composition, compared with NbTi material, Nb 3 Although Sn has a high transition temperature, Nb 3 The manufacturing process of Sn superconducting coil is complicated, and heat treatment is required, and the ceramic phase formed after heat treatment has high hardness and high brittleness, which is easy to be formed in Nb 3 Inducing irreversible damage in Sn superconductors

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