A kind of preparation method of niobium three aluminum superconducting wire precursor

A technology of superconducting wires and precursors, applied in the usage of superconductor elements, cable/conductor manufacturing, superconducting/high-conducting conductors, etc., can solve problems such as electromagnetic instability, magnetic flux jumping and uneven structure, and prevent Breakage, Avoidance of Flux Jumps, Reduced Uniformity Effects

Active Publication Date: 2019-05-24
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of preparation method of niobium three aluminum superconducting wire precursor

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preparation example Construction

[0027] The preparation method of the niobium tri-aluminum superconducting wire precursor of the present invention firstly superimposes the Nb foil and the Al foil and then winds them on the Nb rod, and then successively winds the Cu barrier layer and the Nb protective layer, and then extrudes them into Nb -Al single core rods, and then multiple Nb-Al single core rods are packed into the sheathed Cu tube, and then processed by vacuum electron beam welding sealing, hydrostatic extrusion and drawing, and etching to remove Cu. It is obtained as Nb-Al multi-core composite wire. It includes the following steps:

[0028] Step 1. Make Nb-Al single core rod:

[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 superimposed and wound on a Nb rod and placed in a Cu sheath tube. -The ratio of the thickness of the Al winding on the Nb rod to the diameter of the Nb rod is 1 to 2, and the Cu / Nb-Al...

Embodiment 1

[0039] Step 1. Make Nb-Al single core rod

[0040] Take Cu foil, Nb foil and Al foil with a width of 100 mm, where the thickness of Cu foil and Nb foil is 0.03 mm, and the thickness of Al foil is 0.01 mm. The Nb foil and Al foil are superimposed and wound on a 5.0mm diameter Nb rod to a diameter of 10mm, and then 1 layer of Cu foil and Nb foil are respectively wound, and put into a Cu-clad tube with an inner diameter of 12.8mm and a wall thickness of 1.2mm , To obtain Cu / Nb-Al composite. Using the room temperature hydrostatic extrusion method, the Cu / Nb-Al composite was extruded into a Nb-Al single core rod with a pair of margins of 1.20 mm. After removing the Cu-clad tube on the surface of the bar with nitric acid, it was cut into several bars with a length of 200 mm, thereby obtaining a single core bar with a side distance of 1.0 mm and a length of 200 mm.

[0041] Step 2. Install tube and seal

[0042] The 54 Nb-Al single-core rods obtained in step 1 were put into a Cu sheathin...

Embodiment 2

[0049] Step 1. Make Nb-Al single core rod

[0050] Take Cu foil, Nb foil, and Al foil with a width of 200 mm, where the thickness of the Cu foil and Nb foil is 0.03 mm, and the thickness of the Al foil is 0.01 mm. The Nb foil and Al foil are superimposed and wound on a 5.0mm diameter Nb rod to a diameter of 10mm, and then 5 layers of Cu foil and Nb foil are wound respectively, and they are placed in a Cu-clad tube with an inner diameter of 10.5mm and a wall thickness of 1.0mm , To obtain Cu / Nb-Al composite. Using the room temperature hydrostatic extrusion method, the Cu / Nb-Al composite was extruded into a Nb-Al single core rod with a pair of margins of 3.60 mm. After removing the Cu-clad tube on the surface of the rod with nitric acid, it was cut into several rods with a length of 200 mm to obtain a single core rod with a distance of 3.0 mm and a length of 200 mm.

[0051] Step 2. Install tube and seal

[0052] Put the 172 Nb-Al single core rods obtained in step 1 into a Cu-clad t...

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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 preparation, and specifically relates to a preparation method of a niobium trialuminum superconducting wire 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 performance. It and 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 a better high field J c Characteristics; especially important, it is better than Nb 3 Sn has better stress-strain tolerance characteristics. Therefore Nb 3 Al superconducting wire is considered to have great potential in the application of superconducting magnets such as the next generation thermomagnetic confinement f...

Claims

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Application Information

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Patent Type & Authority Patents(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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