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Preparation method of composite rod for improving performance of Nb3Sn superconducting composite wire

A composite rod and composite wire technology, which is applied in the usage of superconductor elements, superconductive devices, cable/conductor manufacturing, etc., can solve the problem of low proportion of Nb content in CuNb composite rods, low yield rate of wire rod processing, and easy production of Sn elements. Diffusion and other issues, to achieve the effect of increasing the proportion of Nb content, improving utilization, and avoiding coarse grain size

Inactive Publication Date: 2019-12-10
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 object of the present invention is to provide a kind of improving Nb 3 The composite rod preparation method of Sn superconducting composite wire performance solves the problem that the Nb content of the CuNb composite rod prepared by the existing method is not high, which will lead to the easy diffusion of Sn elements, low utilization rate, and low residual resistivity RRR value. problem, improving the current-carrying capacity of Nb3Sn superconducting wire
Also solves Nb 3 Insufficient core wire reaction during heat treatment of Sn superconducting wires, resulting in low wire processing yield

Method used

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  • Preparation method of composite rod for improving performance of Nb3Sn superconducting composite wire
  • Preparation method of composite rod for improving performance of Nb3Sn superconducting composite wire
  • Preparation method of composite rod for improving performance of Nb3Sn superconducting composite wire

Examples

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Effect test

Embodiment 1

[0023] A way to improve Nb 3 A composite rod preparation method for Sn superconducting composite wire performance, the method specifically includes the following steps:

[0024] Step 1: Clean the Nb rod 5, wrap the Nb rod 5 with the copper layer 6 to obtain a CuNb single mandrel 4, the thickness of the copper layer 6 is 10 μm, and the length is 300 mm;

[0025] Step 2: Put the CuNb single mandrel 4, pure Nb rod 2, and hexagonal oxygen-free copper rod 3 in the step 1 into the oxygen-free copper sheath 1 according to the hexagonal arrangement, and the order from outside to inside is: oxygen-free copper sheath Set 1, pure Nb rod 2, CuNb single core rod 4, hexagonal oxygen-free copper rod 3, the specific process is to distribute CuNb single core rod 4 in the periphery of hexagonal oxygen-free copper rod 3, and CuNb single core rod 4 Redistribute the pure Nb rods 2 on the periphery and put them together into the oxygen-free copper sheath 1. The two ends are sealed and welded by va...

Embodiment 2

[0029] The difference from Example 1 is that in step 1 in this example, the way of wrapping the Nb rod 5 with the copper layer 6 is winding with oxygen-free copper foil.

Embodiment 3

[0031] A way to improve Nb 3 A composite rod preparation method for Sn superconducting composite wire performance, the method specifically includes the following steps:

[0032] Step 1: Clean the Nb rod 5, wrap the Nb rod 5 with the copper layer 6 to obtain a CuNb single mandrel 4, the thickness of the copper layer 6 is 300 μm, and the length is 800 mm;

[0033] Step 2: Put the CuNb single mandrel 4, pure Nb rod 2, and hexagonal oxygen-free copper rod 3 in the step 1 into the oxygen-free copper sheath 1 according to the hexagonal arrangement, and the order from outside to inside is: oxygen-free copper sheath Set 1, pure Nb rod 2, CuNb single core rod 4, hexagonal oxygen-free copper rod 3, the specific process is to distribute CuNb single core rod 4 in the periphery of hexagonal oxygen-free copper rod 3, and CuNb single core rod 4 Redistribute the pure Nb rods 2 on the periphery and put them together into the oxygen-free copper sheath 1. The two ends are sealed and welded by v...

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Abstract

The invention discloses a preparation method of a composite rod for improving performance of an Nb3Sn superconducting composite wire. The preparation method comprises steps that a Nb rod is wrapped with a copper layer to obtain a CuNb single-core rod, the CuNb single-core rod, a pure Nb rod and a hexagonal oxygen-free copper rod are bundled according to hexagonal arrangement and are put into an oxygen-free copper sheath, the oxygen-free copper sheath, the pure Nb rod, the CuNb single-core rod and the hexagonal oxygen-free copper rod are sequentially arranged from outside to inside to obtain aCuNb composite sheath, and then the composite rod is obtained through heating and extrusion. The preparation method is advantaged in that the CuNb single-core rod prepared by coating the copper layerand the pure Nb rod are assembled, diffusion of Sn elements to an external Cu region is effectively slowed down, the utilization rate of the Sn elements is improved, an RRR value of the wire is effectively improved, finally, the overall current-carrying capacity of the Nb3Sn superconducting wire is improved, the CuNb single-core rod is obtained through the copper layer wrapping method, the Nb content proportion in the Nb3Sn superconducting wire is increased, moreover, core wire reaction is more sufficient when the Nb3Sn superconducting wire is subjected to heat treatment, and the wire machining yield is increased.

Description

technical field [0001] The invention belongs to the technical field of processing methods for superconducting materials, and in particular relates to a method for increasing Nb 3 A composite rod preparation method for the performance of Sn superconducting composite wires. Background technique [0002] High performance Nb 3 Sn superconducting wire is an important material for manufacturing large-scale particle accelerators. At present, the high critical current density Nb 3 J of Sn superconducting wire c It can reach 2500A / mm under the condition of 12T and 4.2K 2 above. Obtain stable high critical current density Nb 3 Sn long-line preparation technology and mass production capacity are one of the important basic material problems that need to be solved in the manufacture of large-scale accelerators. [0003] Affect Nb 3 The main factors of the critical current density of Sn superconducting wires are the superconducting phase content and the density of grain boundary pi...

Claims

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Application Information

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IPC IPC(8): H01B12/10H01B13/00
CPCH01B12/10H01B13/00Y02E40/60
Inventor 张平祥武博史一功薛宇鑫周安林刘建伟郭强李建峰刘向宏冯勇
Owner 西部超导材料科技股份有限公司
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