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Preparation method of Nb3Al superconducting wire precursor

A technology of superconducting wires and precursors, applied in the usage of superconducting elements, superconducting/high-conducting conductors, cable/conductor manufacturing, etc., can solve the problems of magnetic flux jump, uneven structure, electromagnetic instability, etc., to avoid Magnetic flux jump, breakage prevention, effect of great commercial value

Active Publication Date: 2017-10-20
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

[0006] The purpose of this invention is to provide a kind of preparation method of niobium three aluminum superconducting wire precursor, solve the existing Nb 3 The magnetic flux jump and structural inhomogeneity in the use of Al superconducting wire lead to the problem of electromagnetic instability

Method used

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  • Preparation method of Nb3Al superconducting wire precursor

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preparation example Construction

[0027] The present invention is a preparation method of a niobium tri-aluminum superconducting wire precursor. First, the Nb foil and the Al foil are superimposed and then wound on the Nb rod, and then the Cu barrier layer and the Nb protective layer are wound in turn, and then the Nb foil is extruded and processed into Nb -Al single mandrel, and then multiple Nb-Al single mandrels are put into the sheathed Cu tube, which are processed by vacuum electron beam welding and sealing, hydrostatic extrusion and drawing, and etching to remove Cu. Into the Nb-Al multi-core composite wire, that is. Specifically include the following steps:

[0028] Step 1, make Nb-Al single mandrel:

[0029] The Nb foil with a width of 100-300mm and a thickness of 0.03-0.3mm and an Al foil with a width of 100-300mm and a thickness of 0.01-0.1mm are stacked and wound on the Nb rod and packed into a Cu-coated tube. - The ratio of the thickness of Al wound on the Nb rod to the diameter of the Nb rod is ...

Embodiment 1

[0039] Step 1, making Nb-Al single mandrel

[0040] Take Cu foil, Nb foil and Al foil with a width of 100mm, wherein the thickness of Cu foil and Nb foil is 0.03mm, and the thickness of Al foil is 0.01mm. The Nb foil and Al foil are stacked and wound on a Nb rod with a diameter of 5.0mm to a diameter of 10mm, and then wrapped with a layer of Cu foil and Nb foil respectively, and placed in a Cu-coated tube with an inner diameter of 12.8mm and a wall thickness of 1.2mm , the Cu / Nb-Al composite was obtained. The Cu / Nb-Al composite was extruded into Nb-Al single mandrel rods with a pair edge distance of 1.20 mm by using a hydrostatic extrusion method at room temperature. After the Cu cladding tube on the surface of the bar was removed by etching with nitric acid, it was cut into several bars with a length of 200 mm to obtain a single core bar with a side distance of 1.0 mm and a length of 200 mm.

[0041] Step 2, pipe sealing

[0042] Fifty-four Nb-Al single mandrel rods obtain...

Embodiment 2

[0049] Step 1, making Nb-Al single mandrel

[0050] Take Cu foil, Nb foil and Al foil with a width of 200mm, wherein the thickness of Cu foil and Nb foil is 0.03mm, and the thickness of Al foil is 0.01mm. The Nb foil and Al foil are stacked and wound on a Nb rod with a diameter of 5.0mm to a diameter of 10mm, then 5 layers of Cu foil and Nb foil are wound respectively, and placed in a Cu-coated tube with an inner diameter of 10.5mm and a wall thickness of 1.0mm , the Cu / Nb-Al composite was obtained. The Cu / Nb-Al composite was extruded into Nb-Al single mandrel rods with a pair edge distance of 3.60 mm by using the room temperature hydrostatic extrusion method. After the Cu cladding tube on the surface of the bar was removed by etching with nitric acid, it was cut into several bars with a length of 200 mm to obtain a single core bar with a side distance of 3.0 mm and a length of 200 mm.

[0051] Step 2, pipe sealing

[0052] 172 Nb-Al single core rods obtained in step 1 were...

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Abstract

The invention discloses a preparation method of a Nb3Al superconducting wire precursor. Firstly, a Nb foil and Al foil laminated layer, a Cu barrier layer and a Nb protective layer are sequentially wound on a Nb rod and extruded into a Nb-Al single-core rod; then a plurality of Nb-Al single-core rods are inserted into a clad Cu tube, welded and sealed, then subjected to extrusion, drawing and etching to remove Cu to obtain the Nb3Al superconducting wire precursor. The invention avoids the magnetic flux jumping phenomenon during the using of a Nb3Al wire by adding the Cu barrier layer inside the single core wire. By winding the Nb layer outside the Cu barrier layer, the Cu barrier layer can be protected from damage during processing, and the Cu barrier layers of all core wires can be prevented from being connected with each other to form a connected network during the heat treatment of the wires, which reduces the uniformity of wire cross-sections, resulting in ununiform Nb3Al superconducting wire current carrying capacity.

Description

technical field [0001] The invention belongs to the technical field of low-temperature superconducting wire rod preparation, and particularly relates to a preparation method of a niobium tri-aluminum superconducting wire rod precursor. Background technique [0002] Nb 3 Al is the current superconducting transition temperature (T c ), critical current density (J c ) and the upper critical field (H c2 ) and other low-temperature superconducting materials with the best comprehensive practical properties. it with Nb 3 Sn compared to T c Reaching 19.3K, it also belongs to the A15 structure intermetallic compound and grain boundary pinned superconductor; and has a higher H c2 and better high field J c characteristics; in particular, it is more 3 Sn has more excellent stress-strain tolerance characteristics. Therefore Nb 3 Al superconducting wires are considered to have great potential in superconducting magnet applications such as next-generation thermomagnetic confineme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B12/10
CPCH01B12/10H01B13/00Y02E40/60
Inventor 孙霞光潘熙锋闫果崔利军郗丹刘建伟李建峰刘向宏冯勇张平祥
Owner 西部超导材料科技股份有限公司
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