CN219246443U

CN219246443U - Final blank of internal tin niobium three-tin precursor wire rod

Info

Publication number: CN219246443U
Application number: CN202320067184.8U
Authority: CN
Inventors: 王禺帆
Original assignee: Hefei Kuafu Superconducting Technology Co ltd
Current assignee: Hefei Kuafu Superconducting Technology Co ltd
Priority date: 2023-01-10
Filing date: 2023-01-10
Publication date: 2023-06-23
Anticipated expiration: 2033-01-10

Abstract

The utility model belongs to the technical field of superconducting material processing, and in particular relates to a final blank of an internal tin niobium three-tin precursor wire rod, which is prepared by the steps of ₃ An oxygen-free copper foil is added between the barrier layer of the Sn final blank and the sub-component, when the thickness of the copper layer at the outer side of the sub-component is reduced and the Nb element ratio is increased, the risk that Nb core wires inside the sub-component are contacted with the Ta barrier layer during stretching processing of the final blank is effectively reduced, and the oxygen-free copper foil can improve the deformation of the Ta barrier layer at the outer side of the oxygen-free copper foil and reduce the risk of cracking in the stretching process of the barrier layer.

Description

Final blank of internal tin niobium three-tin precursor wire rod

Technical Field

The utility model belongs to the technical field of superconducting material processing, and particularly relates to a final blank of an internal tin niobium three-tin precursor wire.

Background

Nb by internal tin method ₃ The Sn superconducting wire is prepared by drilling a plurality of through holes along the length direction of an oxygen-free copper ingot, inserting Nb rods into the through holes, sealing and welding copper covers at two ends, extruding to fix the length and cutting to obtain a CuNb composite rod, deep drilling the CuNb composite rod, inserting the Sn rods into the central drilling of the CuNb composite rod, processing into hexagonal, special-shaped and fan-shaped Cu-Nb-Sn sub-components, and packing the Cu-Nb sub-components into oxygen-free copper tubes containing a barrier layer according to the most dense distribution to form Nb ₃ Sn precursor wire final billet, then drawing and rolling the final billet, nb ₃ Sn superconducting wire processingFinally, the wire is heat treated to make the Sn element in the center of each Cu-Nb-Sn subgroup react with the Nb core wires in the subgroup to generate Nb ₃ Sn superconducting phase. In the process of processing, in order to improve Nb ₃ The ratio of superconducting phase in Sn superconducting wire is usually achieved by peeling the CuNb composite rod to reduce the thickness of Cu layer between the subcomponents as much as possible, increase the ratio of Nb in the subcomponents, and further enhance Nb ₃ Current carrying capacity of Sn superconducting wires. However, since the irregular and fan-shaped sub-components are distributed outside the hexagonal sub-components, the Nb core wires in the sub-components are in contact with the barrier layer more seriously due to irregular shape and larger deformation generated during drawing process than the internal sub-components, thereby reducing the damage and failure of the barrier layer ₃ Current carrying capacity of Sn superconducting wire and RRR value.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides an internal tin method Nb ₃ And a final billet of Sn precursor wire.

The utility model relates to an internal tin method Nb ₃ The structure of the Sn precursor wire final blank sequentially comprises Cu-Nb-Sn sub-components, an oxygen-free copper foil, a barrier layer and oxygen-free copper pipes from inside to outside, wherein the Cu-Nb-Sn sub-components are densely distributed, the oxygen-free copper foil is wound into a tube shape and integrally covers the inner side of the barrier layer, and the barrier layer is formed by pure metal Ta materials.

Further, the barrier layer is wound from a pure metal Ta plate or Ta foil.

Further, the oxygen-free copper foil end is inserted into the lap seam of the Ta plate or the Ta foil coil.

Further, the thickness of the oxygen-free copper foil is 0.01-0.5mm.

Further, the Cu-Nb-Sn subgroup is hexagonal, irregular or fan-shaped.

Compared with Nb in the prior art ₃ Compared with the final blank of the Sn superconducting wire, the utility model adds a layer of oxygen-free copper foil between the barrier layer and the sub-component, and by increasing the thickness of copper layer outside the sub-component, the utility model utilizes the characteristic of easy deformation of the Cu material to deform the Ta barrier layerOn the one hand, the lubrication effect effectively reduces the risk of direct contact between Nb core wires and Ta barrier layers in the subunits along with the stretching processing of the final blank, and on the other hand, the oxygen-free copper foil on the inner side can improve the circumferential deformation of the barrier layers on the outer side and reduce the risk of cracking in the stretching process of the barrier layers because Cu is easier to deform compared with Ta. Furthermore, the end part of the coiled oxygen-free copper foil is inserted into the lap joint of the Ta plate or the Ta foil, so that the problem of cracking of the lap joint area of the coiled Ta barrier layer in the subsequent stretching processing process of the final blank can be effectively avoided, and the pollution of the oxygen-free copper on the outer layer is avoided.

Drawings

FIG. 1 shows a prior art internal tin method Nb ₃ A final blank schematic of Sn precursor wires;

FIG. 2 shows the internal tin method Nb of the present utility model ₃ A final blank schematic of Sn precursor wires;

FIG. 3 shows the internal tin method Nb of the present utility model ₃ Partial view of the final blank Ta barrier lap seam of the Sn precursor wire;

wherein, 1, an oxygen-free copper pipe, 2, a barrier layer, 3, a hexagonal subgroup, 4, a special-shaped subgroup, 5, a fan-shaped subgroup and 6, an oxygen-free copper foil.

Detailed Description

The present utility model will be described in further detail below with reference to the drawings and examples for better understanding of the technical solutions of the present utility model to those skilled in the art.

Example 1

Internal tin method Nb ₃ The structure of the Sn precursor wire final blank sequentially comprises Cu-Nb-Sn subunits, an oxygen-free copper foil 6, a barrier layer 2 and an oxygen-free copper tube 1 from inside to outside, wherein the Cu-Nb-Sn subunits take Cu as a base material, the Cu-Nb-Sn subunits internally comprise a plurality of Nb core wires and the central part of the Cu-Nb-Sn subunits are Sn materials, the Cu-Nb-Sn subunits are processed into hexagonal 3, special-shaped 4 and fan-shaped 5, the Cu-Nb-Sn subunits are densely distributed, the oxygen-free copper foil is wound into a tube shape and integrally covers the inner side of the barrier layer, the barrier layer adopts pure metal Ta materials, and the thickness of the oxygen-free copper foil is 0.1mm.

Example 2

Internal tin method Nb ₃ The structure of the Sn precursor wire final blank sequentially comprises Cu-Nb-Sn sub-components, an oxygen-free copper foil 6, a barrier layer 2 and an oxygen-free copper tube 1 from inside to outside, wherein the Cu-Nb-Sn sub-components take Cu as a base material, the Cu-Nb-Sn sub-components internally comprise a plurality of Nb core wires and the central part of the Cu-Nb-Sn sub-components are Sn materials, the Cu-Nb-Sn sub-components are processed into hexagonal 3, special-shaped 4 and fan-shaped 5, the Cu-Nb-Sn sub-components are distributed according to the most dense arrangement, the oxygen-free copper foil is coiled into a tube shape and integrally covers the inner side of the barrier layer, the barrier layer is coiled by using a pure metal Ta plate, the thickness of the oxygen-free copper foil is 0.2mm, and the end part of the oxygen-free copper foil is inserted into a lap joint of the Ta plate.

With the above-described preferred embodiments according to the present utility model as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.

Claims

1. The final blank of the internal tin niobium three tin precursor wire is characterized in that the structure of the final blank sequentially comprises Cu-Nb-Sn sub-components, an oxygen-free copper foil, a barrier layer and oxygen-free copper pipes from inside to outside, the Cu-Nb-Sn sub-components are distributed in a most densely-distributed manner, the oxygen-free copper foil is wound into a tube shape and integrally covers the inner side of the barrier layer, and the barrier layer is formed by pure metal Ta materials.

2. The final blank of an internal tin niobium tri-tin precursor wire as claimed in claim 1, wherein the barrier layer is wound from a pure metallic Ta plate or Ta foil.

3. The final blank of an internal tin niobium tri-tin precursor wire as claimed in claim 2, wherein the oxygen free copper foil ends are inserted into the lap seam of a Ta plate or Ta foil coil.

4. The final blank of an internal tin niobium tri-tin precursor wire as claimed in claim 1, wherein the oxygen free copper foil has a thickness of 0.01-0.5mm.

5. The final billet of an internal tin niobium tri-tin precursor wire as claimed in claim 1, wherein the Cu-Nb-Sn sub-components are hexagonal, shaped or scalloped.