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Method for preparing Nb<3>Sn superconducting wire by low magnetic hysteresis loss internal tin process

A technology of superconducting wire and internal tin method, which is applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., and can solve the problems of easy lapping of core wires, increased hysteresis loss, and small distance between core wires and other problems to achieve the effect of reducing the overlap and hysteresis loss level

Active Publication Date: 2016-02-10
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] The purpose of the invention is to provide a low hysteresis loss inner tin method to prepare Nb 3 The method of Sn superconducting wire rod solves the Nb produced by the existing method 3 Sn superconducting wire core wire spacing is small, which leads to easy overlap of core wires, resulting in increased hysteresis loss

Method used

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  • Method for preparing Nb&lt;3&gt;Sn superconducting wire by low magnetic hysteresis loss internal tin process
  • Method for preparing Nb&lt;3&gt;Sn superconducting wire by low magnetic hysteresis loss internal tin process
  • Method for preparing Nb&lt;3&gt;Sn superconducting wire by low magnetic hysteresis loss internal tin process

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Embodiment 1

[0040] Step 1: Take an oxygen-free copper ingot with a diameter of 300mm and a length of 650mm as the billet, drill 200 uniformly distributed through holes 2 with a diameter of 10mm in the cross section, and leave an area with a width of 20mm in the radial direction Without drilling, the porous copper ingot 1 is obtained as the spaced region 3 between the holes;

[0041] Step 2: The porous copper ingot 1 obtained in step 1 is first used to remove the surface oil stains with a metal cleaner, and then the inner hole and the surface are cleaned with a 40% nitric acid solution by volume, using 35% nitric acid, 20% hydrofluoric acid and residual Clean the Nb rod with a solution of water, insert the cleaned Nb rod into the through hole 2 of the porous copper ingot 1, add copper caps at both ends and use electron beam sealing and welding, the sealing welding current is 90mA, and the welding vacuum degree is 6.0× 10 -3 Pa, to obtain a CuNb multi-core sheath;

[0042] Step 3: Heat th...

Embodiment 2

[0046] Step 1: Take an oxygen-free copper ingot with a diameter of 250mm and a length of 700mm as the billet, drill 150 uniform through holes 2 with a diameter of 12mm in the cross section, and leave 2 areas with a width of 5mm in the radial direction Without drilling, the porous copper ingot 1 is obtained as the spaced region 3 between the holes;

[0047] Step 2: The porous copper ingot 1 obtained in step 1 was first used to remove the oil stains on the surface, and then the inner hole and the surface were cleaned with a 30% nitric acid solution by volume, and 25% nitric acid + 15% hydrofluoric acid + residual The Nb rod is cleaned with a solution of water in the amount of water, and the cleaned Nb rod is inserted into the through hole 2 of the porous copper ingot 1, and the copper caps are added at both ends and welded with electron beams. The sealing welding current is 50mA, and the welding vacuum degree is 7.0 × 10 -3 Pa, to obtain a CuNb multi-core sheath;

[0048] Step ...

Embodiment 3

[0052] Step 1: Take an oxygen-free copper ingot with a diameter of Φ200mm and a length of 400mm as the billet, drill 100 uniform through holes 2 with a diameter of Φ15mm in the cross section, and leave 3 areas with a width of 10mm in the radial direction Without drilling, the porous copper ingot 1 is obtained as the spaced region 3 between the holes;

[0053] Step 2: The porous copper ingot 1 obtained in step 1 is first used to remove the oil stains on the surface, and then the inner hole and the surface are cleaned with a nitric acid solution with a volume concentration of 25%, using 30% nitric acid, 25% hydrofluoric acid and residual Clean the Nb rod with a solution of water, insert the cleaned Nb rod into the through hole 2 of the porous copper ingot 1, add copper caps at both ends, and use electron beam sealing and welding, the sealing welding current is 150mA, and the welding vacuum degree is 5.0× 10 -3 Pa, to obtain a CuNb multi-core sheath;

[0054] Step 3: Heat the C...

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Abstract

The invention discloses a method for preparing a Nb<3>Sn superconducting wire by a low magnetic hysteresis loss internal tin process. The method comprises the following steps: dividing the cross section of an oxygen-free copper ingot into a plurality of regions with equal area, drilling evenly distributed through holes in each region, and not drilling one part between every two regions; inserting Nb bars into the through holes of the copper ingot, adding copper covers at two ends and carrying out soldering and sealing to obtain a CuNb multi-core sheath; carrying out a heating extrusion to obtain the bar; carrying out stretching and specified-length cut-off to obtain a CuNb composite bar; carrying out deep-hole drilling on the composite bar to obtain a CuNb composite pipe; inserting a SnTi alloy bar into the composite pipe, carrying out stretching and molding to obtain a sub-component; enclosing the sub-component and a barrier layer cluster into an oxygen-free copper pipe, so as to obtain a final Nb<3>Sn blank; and carrying out multi-pass stretching to obtain the Nb<3>Sn superconducting wire. According to the method, distribution of the holes in the porous copper ingot is optimized; and the evenly distributed through holes are divided into a few of regions with certain intervals, so that cored wire overlapping in a thermal treatment process is reduced; and the magnetic hysteresis loss level of a braided wire is significantly lowered under the condition of ensuring that the wire has relatively a high critical current density level.

Description

technical field [0001] The invention belongs to the technical field of superconducting material processing, in particular to a low hysteresis loss internal tin method for preparing Nb 3 The method of Sn superconducting wire. Background technique [0002] The CS coil, that is, the central solenoid coil, is the coil with the highest operating magnetic field and the highest operating environment requirements in the ITER (International Thermonuclear Fusion Experimental Reactor) magnet system. . Nb for CS coil 3 The main feature of Sn superconducting wire is its high critical current density and low hysteresis loss level. It is the superconducting strand with the highest performance requirements in ITER magnets. Its critical current Ic is greater than 228A, the hysteresis loss Qh is less than 500mJ / cm at 4.2K and ±3T 3 . [0003] The internal tin method is currently the most widely used method for producing high current density, low cost Nb 3 The preferred process for Sn wi...

Claims

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Application Information

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IPC IPC(8): H01B13/00H01B12/00H01B12/02
CPCY02E40/60
Inventor 史一功张科高慧贤刘建伟李建峰张丰收刘向宏冯勇
Owner 西部超导材料科技股份有限公司