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Preparation method of Nb3Al superconducting precursor wire rod based on layer-by-layer stacking

A precursor and wire technology, applied in the field of preparation of multi-core Nb3Al superconducting precursor wires, can solve the problems of uneven deformation, difficult adjustment, segregation, etc., and achieve uniform tightness, convenient displacement and deformation, and simple filling operation. Effect

Active Publication Date: 2018-11-23
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The compound after winding is prone to problems such as large size deviation, low tube filling rate, and uneven lamination between layers.
In addition, the foils of each layer of the composite after winding are extruded, entangled, and pulled to form constraints, which are difficult to adjust in the later stage, which leads to uneven deformation of each component in subsequent processing. During the process, it is easy to have defects such as wire breakage and component segregation in the wire, which will eventually affect the performance of the superconducting wire.
As a result, it is difficult to process, the consistency of the product is poor, and the pass rate is low

Method used

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  • Preparation method of Nb3Al superconducting precursor wire rod based on layer-by-layer stacking
  • Preparation method of Nb3Al superconducting precursor wire rod based on layer-by-layer stacking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] figure 1 , figure 2 It shows that a specific embodiment of the present invention is a layer-by-layer stacked Nb 3 The preparation method of Al superconducting precursor wire rod, its steps are:

[0031] A. Preparation of Nb-Al composite sheath

[0032] Remove the upper cover 1 of the tubular Nb box 2, stack Nb foils 3 and Al foils 4 alternately in the rectangular groove of the tubular Nb box 2 from bottom to top, then cover the upper cover 1 of the tubular Nb box 2; finally put the tubular The Nb box 2 is set in the Cu tube, and the two ends of the Cu tube are welded and sealed by vacuum electron beams to obtain the Nb-Al composite sheath;

[0033] The thickness of the Nb foil 3 is 0.03mm, the thickness of the Al foil 4 is 0.01mm, and the purity of the Nb foil 3 and the Al foil 4 are both higher than 99.9%.

[0034] The number of layers of the Nb foil 3 or Al foil 4 is 100, and the wall thickness of the Nb box 2 is 1mm.

[0035] The ratio of the volume of the rect...

Embodiment 2

[0042] A layer-by-layer stacking of Nb 3 The preparation method of Al superconducting precursor wire rod, its steps are:

[0043] A. Preparation of Nb-Al composite sheath

[0044] Remove the upper cover 1 of the tubular Nb box 2, stack Nb foils 3 and Al foils 4 alternately in the rectangular groove of the tubular Nb box 2 from bottom to top, then cover the upper cover 1 of the tubular Nb box 2; finally put the tubular The Nb box 2 is set in the Cu tube, and the two ends of the Cu tube are welded and sealed by vacuum electron beams to obtain the Nb-Al composite sheath;

[0045] The thickness of the Nb foil 3 is 0.13mm, the thickness of the Al foil 4 is 0.05mm, and the purity of the Nb foil 3 and the Al foil 4 are both better than 99.9%.

[0046] The number of layers of the Nb foil 3 or Al foil 4 is 125, and the wall thickness of the Nb box 2 is 5mm.

[0047] The ratio of the volume of the rectangular slot of the Nb box 2 to the volume of the whole Nb box 2 is 2.5:4.

[0048...

Embodiment 3

[0054] A layer-by-layer stacking of Nb 3 The preparation method of Al superconducting precursor wire rod, its steps are:

[0055] A. Preparation of Nb-Al composite sheath

[0056] Remove the upper cover 1 of the tubular Nb box 2, stack Nb foils 3 and Al foils 4 alternately in the rectangular groove of the tubular Nb box 2 from bottom to top, then cover the upper cover 1 of the tubular Nb box 2; finally put the tubular The Nb box 2 is set in the Cu tube, and the two ends of the Cu tube are welded and sealed by vacuum electron beams to obtain the Nb-Al composite sheath;

[0057] The thickness of the Nb foil 3 is 0.3mm, the thickness of the Al foil 4 is 0.1mm, and the purity of the Nb foil 3 and the Al foil 4 are both higher than 99.9%.

[0058] The number of layers of the Nb foil 3 or Al foil 4 is 150, and the wall thickness of the Nb box 2 is 10 mm.

[0059] The ratio of the volume of the rectangular slot of the Nb box 2 to the volume of the whole Nb box 2 is 3:4.

[0060] ...

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Abstract

The invention relates to a preparation method of an Nb3Al superconducting precursor wire rod based on layer-by-layer stacking. The preparation method mainly comprises the steps of A, preparation of anNb-Al composite sheath: enabling an Nb foil and an Al foil to be alternately stacked in a tubular Nb box rectangular groove from the bottom up, covering an upper cover, sleeving in a Cu pipe and performing welding and sealing; B, preparation of an Nb-Al single-core rod: performing static liquid extrusion, repeated drawing and pulling for many times and corrosion and copper removal on the Nb-Al composite sheath to obtain the Nb-Al single-core rod; and C, preparation of the Nb3Al superconducting precursor wire rod: enabling multiple Nb-Al single-core rods to be assembled into a Cu or Cu alloy sheath, and carrying out electron beam sealing and welding, static liquid extrusion, and repeatedly drawing and pulling and processing for multiple times to obtain a multi-core wire rod; and carrying out corrosion and copper removal. The method is simple to operate, the assembly filling rate of the foil materials is high, and the compactness of each layer of foil materials is uniform and consistent. The finally prepared superconducting wire rod prepared by the method is high in performance, high in consistency and high in percent of pass. The method is especially suitable for preparation of superconducting long wire rods.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of low-temperature superconducting materials, and in particular relates to a multi-core Nb 3 A method for preparing an Al superconducting precursor wire. Background technique [0002] Nb 3 Al is the current superconducting transition temperature (T c ), critical current density (J c ) and upper critical field (H c2 ) and other low-temperature superconducting materials with the best comprehensive practical performance. it with Nb 3 Compared with Sn, the superconducting transition temperature reaches 19.3K, and it also belongs to the A15 structure intermetallic compound and grain boundary pinned superconductor; and has a higher upper critical field and better high-field critical current density characteristics; especially important, It is better than Nb 3 Sn has more excellent stress-strain tolerance characteristics. Therefore Nb 3 Al superconducting wires are considered to have...

Claims

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Application Information

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IPC IPC(8): H01B12/10H01B13/00
CPCH01B12/10H01B13/00H01B13/0006Y02E40/60
Inventor 孙霞光羊新胜潘熙锋赵勇
Owner SOUTHWEST JIAOTONG UNIV
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