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Preparation method for NbTi/Cu multi-core composite superconducting wire with rectangular section

A rectangular cross-section, superconducting wire rod technology, applied in the usage of superconductor elements, cable/conductor manufacturing, superconducting devices, etc., can solve the problems of difficult processing, uneven force, etc. Uniform and simple process steps

Inactive Publication Date: 2010-06-09
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for preparing a rectangular cross-section NbTi / Cu multi-core composite superconducting wire for the deficiencies in the above-mentioned prior art, which has simple process flow, low preparation cost and good preparation effect, and improves The filling factor between the windings in the superconducting magnet winding process, while the wire still maintains a high critical current density, overcomes the defects and deficiencies of the traditional four-roll rolling mill or profile rolling mill in the rolling process such as uneven force and difficult processing.

Method used

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  • Preparation method for NbTi/Cu multi-core composite superconducting wire with rectangular section
  • Preparation method for NbTi/Cu multi-core composite superconducting wire with rectangular section

Examples

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preparation example Construction

[0037] Such as figure 1 As shown, the method for preparing the rectangular cross-section NbTi / Cu multi-core composite superconducting wire of the present invention includes the following steps:

[0038] Step 1. One-time extrusion assembly, the extrusion assembly process is as follows:

[0039] 101. The first assembly: Assemble the NbTi rod, the pure Nb liner tube and the oxygen-free copper outer sheath into a NbTi / Cu composite sheath. The NbTi / Cu composite sheath consists of a NbTi rod and a coaxial sheath in the NbTi rod. The pure Nb lining pipe on the upper side and the oxygen-free copper outer sleeve coaxially sleeved on the pure Nb inner lining pipe; the oxygen-free copper outer sleeve includes an oxygen-free copper outer tube and the oxygen-free copper outer tube One upper and lower end cover one;

[0040] 102. The first vacuum sealing welding: the upper and lower end caps described in step 101 are welded to the upper and lower ends of the oxygen-free copper outer tube by vacu...

Embodiment 1

[0055] In this embodiment, when preparing a rectangular cross-section NbTi / Cu multi-core composite superconducting wire, the main steps are as follows:

[0056] Step 1. One-time extrusion assembly, the extrusion assembly process is as follows:

[0057] 101. First assembly: First, assemble the processed Φ76mmNbTi rod, Φ100×210mm oxygen-free copper outer jacket 1 and pure Nb liner pipe into a NbTi / Cu composite jacket; and before assembly, the NbTi rod and pure Nb The inner lining pipe and the oxygen-free copper outer jacket are respectively pickled, dehydrated and dried; and when pickling is carried out, a mixed acid composed of nitric acid and water is used for the oxygen-free copper outer jacket-pickling; nitric acid and water are used The mixed acid composed of hydrofluoric acid and NbTi rods and pure Nb lined pipes are pickled, and then dehydrated with alcohol.

[0058] 102. The first vacuum sealing welding: the upper and lower end caps described in step 101 are welded to the uppe...

Embodiment 2

[0075] In this embodiment, the difference from embodiment 1 is: in the first assembly in step 101, the processed Φ76mmNbTi rod, Φ100×210mm oxygen-free copper outer sleeve 1 and pure Nb lined tube are assembled into NbTi / Cu Composite sheath; in step 207, the 7914-core NbTi / Cu obtained by the second main drawing and aging heat treatment is performed by drawing equipment and using two rectangular shaped molds with dimensions of 2.9×1.1mm and 2.7×1.0mm The composite filament is drawn in two molds and the critical current density is 2.05×10 6 A / cm 2 (4.2K, 5T) rectangular cross-section NbTi / Cu multi-core composite superconducting wire finished product. In this embodiment, the rest of the process steps, process parameters, and preparation process are the same as in Example 1.

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Abstract

The invention discloses a preparation method for an NbTi / Cu multi-core composite superconducting wire with a rectangular section, which comprises the following steps of: firstly, assembling an NbTi bar, a pure Nb inner pipe and an oxygen-free copper sheath in turn to form an NbTi / Cu composite sheath, sealing an upper end cap and a lower end cap of the NbTi / Cu composite sheath through vacuum welding, and then performing primary extrusion to obtain an NbTi / Cu composite bar; secondly, drawing and scaling the composite bar, and keeping on drawing the composite bar to obtain a hexagonal core rod, and performing assembling for the second time; and thirdly, performing vacuum solder sealing, hot isostatic pressing, secondary extrusion, bar drawing and scaling on the sheath which is assembled in the second time to finally obtain the NbTi / Cu multi-core composite superconducting wire with the rectangular section. The preparation method has the advantages of simple process flow, low preparation cost and good preparation effect, improves the fill factor among windings in the process of coiling a superconducting magnet but simultaneously keeps high critical current density for the wire, and overcomes the defects that the conventional four-high mill or forming roll mill is unevenly stressed, is difficult to process and the like in the rolling process.

Description

Technical field [0001] The invention relates to a preparation method of a multi-core composite superconducting wire, in particular to a preparation method of a rectangular cross-section NbTi / Cu multi-core composite superconducting wire. Background technique [0002] Magnetic resonance imaging (MRI) technology uses the characteristics of the spin motion of atomic nuclei to generate a signal after a radio frequency pulse generator in an external enhanced magnetic field, which is detected by a detector and processed and converted to obtain an image. The core of MRI is the magnet system, which is mainly divided into permanent magnet system (the magnetic field strength is generally less than 0.5T) and the superconducting magnet system (the magnetic field strength is generally greater than 1.5T). Since MRI based on superconducting magnets can obtain higher image resolution, superconducting MRI is the mainstream development direction of MRI technology and has been widely used in medical...

Claims

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Application Information

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IPC IPC(8): H01B13/00H01B12/10
CPCY02E40/644Y02E40/60
Inventor 陈自力杜社军梁明焦高峰闫果李成山刘向宏冯勇张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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