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Preparation method for copper-niobium composite rod for Nb3Sn superconducting wire with high critical current density

A current density and superconducting wire technology, which is applied in the usage of superconductor elements, cable/conductor manufacturing, superconducting devices, etc., can solve the problems of stretching broken wires, uneven structure of Nb core wires, etc., to improve efficiency, The effect of reducing quality risk

Active Publication Date: 2017-09-15
西安聚能超导线材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a copper-niobium composite rod for a high critical current density niobium-three-tin superconducting wire, which solves the inhomogeneous structure of the Nb core wire in the CuNb composite rod prepared by the existing method, which leads to the superconducting wire The problem of stretching and breaking wires during processing

Method used

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  • Preparation method for copper-niobium composite rod for Nb3Sn superconducting wire with high critical current density
  • Preparation method for copper-niobium composite rod for Nb3Sn superconducting wire with high critical current density

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preparation example Construction

[0019] A kind of high critical current density Nb of the present invention 3 A method for preparing a CuNb composite rod for a Sn superconducting wire, specifically comprising the following steps:

[0020] Step 1, the oxygen-free copper rod is obtained by extrusion, drawing, sawing and other processes to obtain an outer hexagonal inner circle thin-walled copper tube with a length of 300mm-800mm, an opposite side size of 5mm-15mm, and an inner hole diameter of Φ4mm-Φ14mm ;

[0021] Step 2, put Nb rods into the hexagonal copper tube obtained in step 1 after cleaning, the number is 150-800, and then stack them in a hexagonal arrangement and put them into an oxygen-free copper sheath with a diameter of Φ150mm~Φ300mm , the oxygen-free copper rod with the same specifications as the hexagonal copper tube is placed in the central area, and the copper caps are added to the two ends and sealed with electron beams to obtain a CuNb composite sheath; the obtained CuNb composite sheath str...

Embodiment 1

[0025] Step 1, the oxygen-free copper rod is obtained by extruding, drawing, sawing and other processes to obtain an outer hexagonal inner circle thin-walled copper tube with a length of 300mm, an opposite side size of 5mm, and an inner hole diameter of Φ4mm;

[0026] Step 2, put the Nb rods into the hexagonal copper tubes obtained in step 1 after cleaning, the number is 150, and then stack them in a hexagonal arrangement and put them into the oxygen-free copper sheath, the diameter of the sheath is Φ150mm, and the central area Put the oxygen-free copper rods with the same specifications as the hexagonal copper tubes, the number of oxygen-free copper rods is 100, add copper caps at both ends and seal with electron beams to obtain a CuNb composite sheath;

[0027] In step 3, the CuNb composite sheath obtained in step 2 is heated to 580° C., kept for 2 hours, and then extruded to obtain a CuNb composite rod.

Embodiment 2

[0029] Step 1, the oxygen-free copper rod is obtained by extruding, drawing, sawing and other processes to obtain an outer hexagonal inner circle thin-walled copper tube with a length of 800mm, an opposite side size of 10mm, and an inner hole diameter of Φ9mm;

[0030] Step 2, put the Nb rods into the hexagonal copper tubes obtained in step 1 after cleaning, the number is 800, and then stack them in a hexagonal arrangement and put them into the oxygen-free copper sheath, the diameter of the sheath is Φ300mm, and the central area Put oxygen-free copper rods with the same specifications as the hexagonal copper tubes, the number of oxygen-free copper rods is 400, add copper caps at both ends and seal with electron beams to obtain CuNb composite sheaths;

[0031] Step 3: Heat the CuNb composite sheath obtained in step 2 to 650° C., hold the temperature for 1 hour, and extrude to obtain a CuNb composite rod.

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Abstract

The invention discloses a preparation method for a copper-niobium composite rod for an Nb3Sn superconducting wire with high critical current density. The method comprises the following steps of firstly, processing an oxygen-free copper rod into an outer hexagonal inner-circle thin-wall copper pipe; secondly, placing an Nb rod into the hexagonal copper pipe, placing the hexagonal copper pipe into an oxygen-free copper sheath, placing the oxygen-free copper rod at the central zone of the oxygen-free copper sheath and sealing to obtain a CuNb composite sheath; and lastly, carrying out heating, thermal insulation and extrusion on the CuNb composite sheath to obtain the CuNb composite rod. According to the method, the Nb rod with the fine initial grain size is placed into the hexagonal thin-wall copper pipe to carry out assembly, welding and extrusion to obtain the CuNb composite rod, so that the processing of a CuNb single rod is removed, and the problems of line breakage and core breakage after stretch in the subsequent processing process of the superconducting wire, which are caused by uneven texture after extrusion due to the coarse initial grain size of an Nb ingot, are solved, the efficiency is improved and the quality risk of the processing process is reduced.

Description

technical field [0001] The invention belongs to the technical field of superconducting material processing, and in particular relates to a method for preparing a copper-niobium composite rod for a high critical current density niobium-three-tin superconducting wire. Background technique [0002] High critical current density 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 bound...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B13/22H01B12/02
CPCH01B12/02H01B13/00H01B13/0016H01B13/22Y02E40/60
Inventor 史一功孙霞光武博张科刘建伟李建峰刘向宏冯勇
Owner 西安聚能超导线材科技有限公司
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