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Nb3Al precursor wire rod with high current-carrying density and low loss and preparation method thereof

A current density, low loss technology, applied in low loss Nb3Al precursor wire and its preparation, high current density field, can solve the problem of batch preparation and engineering application of precursor wire, limit large-scale engineering application, wire core The problem of large wire size is achieved, and the effect of low cost, reduced production cost and increased area is achieved

Pending Publication Date: 2021-07-30
合肥夸夫超导科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to high equipment requirements for room temperature hydrostatic extrusion, especially the secondary hydrostatic extrusion force is very large, even exceeding 1000 MPa, and my country currently lacks large-scale hydrostatic extrusion equipment, which limits the large-scale production of this material. Engineering Applications
[0008] (3) In existing Nb 3 In Al superconducting wires, the method of multi-core assembly is usually adopted at one time, and the number of core wires that can be prepared by this method is usually no more than 1000 cores at most, so the size of the wire core wire is large, and the AC loss is also large
[0009] In order to solve the above Nb 3 The batch preparation of Al precursor wires and engineering application problems, the present invention proposes a high current-carrying density, low loss Nb 3 Al precursor wire and preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A high current carrying density, low loss Nb 3 The preparation method of Al precursor wire rod, comprises the following steps:

[0026] (1) Fabrication of a composite rod: After stacking Nb foil and Al foil with a width of 200 mm and a thickness of 0.1 mm and 0.03 mm without a center Nb rod, it was wound into a Nb-Al composite rod with a diameter of 8 mm; then Put it into a Ta tube with an outer diameter of 10 mm and a wall thickness of 1.0 mm; then use the groove rolling method to process the Ta / Nb-Al composite into a hexagonal Ta / Nb-Al primary composite rod with a distance across sides of 10 mm ;

[0027] (2) Making secondary composite rods: put 7 Ta / Nb-Al primary composite rods with a length of 2 m into a Cu-Ni alloy tube containing a Ta barrier layer, and then process them to the distance across sides by rolling 1.20 mm hexagonal Cu-Ni / Ta / Nb-Al composite rod; after Cu-Ni was etched, a hexagonal Ta / Nb-Al secondary composite rod with a distance across sides of 1.0 m...

Embodiment 2

[0032] A high current-carrying density, low loss Nb 3 The preparation method of Al precursor wire rod, comprises the following steps:

[0033] (1) Fabrication of primary composite rods: Nb foils and Al foils with a width of 300 mm and a thickness of 0.1 mm and 0.03 mm without a center Nb rod were stacked, and then wound into a Nb-Al composite rod with a diameter of 8 mm; Then put it into a Ta tube with an outer diameter of 10 mm and a wall thickness of 1.0 mm; then, the Ta / Nb-Al composite body is processed into a hexagonal Ta / Nb-Al composite with a distance across sides of 1.0 mm by using the groove rolling method Great;

[0034] (2) Making secondary composite rods: put 1000 Ta / Nb-Al primary composite rods with a length of 400 mm into a Cu-Ni alloy tube containing a Ta barrier layer, and then process it into opposite sides by hot extrusion A hexagonal Cu-Ni / Ta / Nb-Al composite rod with a distance of 3.0 mm; after Cu-Ni was etched, a hexagonal Ta / Nb-Al secondary composite rod ...

Embodiment 3

[0039] A high current-carrying density, low loss Nb 3 The preparation method of Al precursor wire rod, comprises the following steps:

[0040] (1) Fabricate a composite rod: After stacking Nb foil and Al foil with a width of 150 mm and a thickness of 0.1 mm and 0.03 mm without a center Nb rod, they were wound into a Nb-Al composite rod with a diameter of 8.0 mm; then Put it into a Ta tube with an outer diameter of 10 mm and a wall thickness of 1.0 mm; then use the groove rolling method to process the Ta / Nb-Al composite body into a hexagonal Ta / Nb-Al primary composite rod with a distance across the sides of 3.0 mm;

[0041] (2) Fabrication of secondary composite rods: 54 Ta / Nb-Al primary composite rods with a length of 2 m were loaded into a Cu-Ni alloy tube containing a Nb barrier layer, and then processed into opposite sides by direct drawing A hexagonal Cu-Ni / Nb / Nb-Al composite rod with a distance of 3.0 mm; after Cu-Ni was etched, a hexagonal Nb / Nb-Al secondary composite r...

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Abstract

The invention discloses an Nb3Al precursor wire rod with high current-carrying density and low loss and a preparation method thereof. The method comprises the steps: (1) winding Nb foil and Al foil without a center Nb rod into an Nb-Al composite body, putting the Nb-Al composite body into a Ta barrier layer tube, and then machining the Ta / Nb-Al composite body into a hexagonal Ta / Nb-Al primary composite rod; (2) loading a plurality of Ta / Nb-Al primary composite rods into a Cu-Ni alloy tube containing a Ta or Nb barrier layer, and processing the Ta / Nb-Al primary composite rods into hexagonal Ta / Nb-Al secondary composite rods; (3) loading a plurality of Ta / Nb-Al secondary composite rods into a Cu-Ni alloy tube containing a Ta or Nb barrier layer, and processing into a Cu-Ni sheathed Ta / Nb-Al tertiary composite rod; (4) processing the tertiary composite rod into a multi-core wire rod in a rolling or drawing manner, and obtaining the Nb3Al precursor wire rod with high current-carrying density and low loss. The Nb3Al wire prepared by the method is not easy to break in the plastic working process, has better current-carrying performance and lower loss, and is more beneficial to the application of high-field magnets in the field of high-intensity magnetic fields.

Description

technical field [0001] The invention belongs to the technical field of superconducting materials, in particular to a high current-carrying density, low loss Nb 3 Al precursor wire and its preparation method. Background technique [0002] Due to better stress-strain tolerance characteristics, excellent high-field current-carrying density performance, niobium trialuminum (Nb 3 Al) low-temperature superconductor, considered to be the future niobium-tritin (Nb 3 Sn) is a substitute material for superconductors; it has great potential in the application of high-field superconducting magnets in many fields such as high-energy particle accelerators with a magnetic field strength of 15 T (Tesla), nuclear magnetic resonance spectrometers (NMR), and magnetic confinement nuclear fusion (ITER). Great business potential. [0003] Currently, high current-carrying density Nb 3 Sn superconducting wires are usually prepared by the inner tin method, but the inner tin method Nb 3 In the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B12/02
CPCH01B12/02Y02E40/60
Inventor 潘熙锋
Owner 合肥夸夫超导科技有限公司
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