Method for preparing Nb3Sn superconducting wire by winding process

A technology of superconducting wire and winding method, which is applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., and can solve the problems of short heat treatment time, long heat treatment time, and large size of Nb core wire. , to reduce the kinetic conditions of the diffusion reaction, simplify the production process, and achieve the effect of short diffusion distance

Active Publication Date: 2019-11-12
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above two methods, since the Nb rod is used as the Nb source, the initial size of Nb is larger, resulting in a larger size of the Nb core wire in the finished wire
for Nb 3 Sn superconducting wire, the finer the grain, the better the superconducting performance; in Nb 3 During the heat treatment process of Sn wire, the higher the heat treatment temperature, the faster the grain growth; while the heat treatment temperature is too low, the Nb / Sn diffusion reaction speed will be slow, and the heat treatment time will be too long
However, the lower heat treatment temperature and shorter heat treatment time will cause unreacted Nb in the center of the Nb core wire, resulting in lower performance of the superconducting wire

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The invention provides a winding method Nb 3 The preparation method of Sn superconducting wire specifically comprises the following steps:

[0032] 1) Prepare a winding assembly formed by Sn alloy foil, Cu foil, Nb foil and copper rod;

[0033] 2) packing the winding assembly into the first oxygen-free copper tube, and sealing both ends of the first oxygen-free copper tube to obtain a CuNbSn composite rod;

[0034] 3) hydrostatically extruding the CuNbSn composite rod to obtain a billet, drawing the billet and cutting to length to obtain hexagonal CuNbSn subcomponents;

[0035] 4) Put several hexagonal CuNbSn subcomponents into the second oxygen-free copper tube and assemble them according to the close-packed hexagonal structure to obtain Nb 3 Sn final blank;

[0036] 5) For the Nb 3 Sn final billets are stretched multiple times to produce finished Nb 3 Sn precursor wire;

[0037] 6) For finished Nb 3 Sn precursor wires are heat treated to produce finished Nb 3 ...

Embodiment 2

[0053] The invention provides a method for preparing a winding Nb3Sn superconducting wire, which specifically includes the following steps:

[0054] Step 1. Select an oxygen-free copper rod with a diameter of 8mm and a length of 120mm, spread the Sn-Ti foil, Cu foil and Nb foil with a width of 120mm in the order of top, middle and bottom, and place the copper rod on the Sn-Ti foil , wound along the copper rod to a diameter of 25mm;

[0055] Step 2. Put the finished assembly wound in step 1 into a cleaned oxygen-free copper tube with an inner diameter of 25mm and a wall thickness of 3mm, and seal it with a vacuum electron beam at both ends;

[0056] Step 3, hydrostatically extruding the sealed CuNbSn composite rod in step 2 to a diameter of 12 mm, drawing the extruded billet to obtain a hexagonal CuNbSn subcomponent with a distance across sides of 3 mm and a length of 1000 mm;

[0057] Step 4. Put the 18 hexagonal CuNbSn subcomponents obtained in step 3 into an oxygen-free coppe...

Embodiment 3

[0060] The invention provides a method for preparing a winding Nb3Sn superconducting wire, which specifically includes the following steps:

[0061] Step 1. Select an oxygen-free copper rod with a diameter of 12mm and a length of 180mm, lay the Sn-Ti foil, Cu foil and Nb foil with a width of 180mm in the order of top, middle and bottom, and place the copper rod on the Sn-Ti foil , wound along the copper rod to a diameter of 35mm;

[0062] Step 2. Put the finished assembly wound in step 1 into a cleaned oxygen-free copper tube with an inner diameter of 35mm and a wall thickness of 4mm, and seal it with a vacuum electron beam at both ends;

[0063] Step 3, hydrostatically extruding the sealed CuNbSn composite rod in step 2 to a diameter of 15 mm, and drawing the extruded billet to obtain a hexagonal CuNbSn subcomponent with a distance across sides of 4 mm and a length of 1500 mm;

[0064] Step 4. Put 30 hexagonal CuNbSn subcomponents obtained in step 3 into an oxygen-free coppe...

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Abstract

The invention belongs to the technical field of superconducting material processing, and relates to a method for preparing an Nb3Sn superconducting wire by a winding process. The preparation method comprises the following steps: preparing a wound combination formed by an Sn alloy foil, a Cu foil, an Nb foil and a copper rod; putting the wound combination in a first oxygen-free copper tube, and sealing the two ends of the first oxygen-free copper tube to obtain a CuNbSn composite rod; performing hydrostatic extrusion on the CuNbSn composite rod to obtain a blank, drawing the blank, and sizing and cutting the blank to obtain hexagonal CuNbSn sub-components; putting the hexagonal CuNbSn sub-components into a second oxygen-free copper tube, and assembling the hexagonal CuNbSn sub-components according to a close-packed hexagonal form to obtain a final Nb3Sn blank; drawing the final Nb3Sn blank to prepare a finished Nb3Sn precursor wire; and carrying out heat treatment on the finished Nb3Snprecursor wire to prepare the finished Nb3Sn superconducting wire. According to the method, the manufacturing process of the Nb3Sn superconducting wire is simplified, and the Nb / Sn diffusion reactionkinetics conditions are reduced.

Description

technical field [0001] The invention belongs to the technical field of superconducting material processing, and relates to a winding method Nb 3 A method for preparing a Sn superconducting wire. Background technique [0002] Niobium tritin (Nb 3 Sn) low-temperature superconducting materials are currently one of the most important materials for the application of high-field superconducting magnets above 10T. Wide range of applications. The inner tin method and the bronze method are currently used to produce Nb 3 Two traditional methods for Sn superconducting wires. [0003] Inner tin method Nb 3 The manufacturing process of the Sn wire rod is as follows: first make the porous copper ingot, then insert the Nb rod into the porous copper ingot, and process it into a Cu-Nb composite rod through hot isostatic pressing and hot extrusion. Then drill a hole in the center, insert a Sn alloy rod, and then undergo cold working processes such as drawing to obtain the inner tin meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B12/06H01B12/02
CPCH01B12/02H01B12/06Y02E40/60
Inventor 侯艳荣潘熙锋王大友孙霞光陈传闫果刘向宏冯勇张平祥
Owner 西部超导材料科技股份有限公司
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