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Heat treatment device and method for a high-performance iron-based superconducting wire

A heat treatment device, iron-based superconducting technology, applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve the problems such as difficult to obtain textured iron-based superconducting wires, and achieve It is conducive to large-scale popularization and application, reduces the complexity of the preparation process, and reduces the effect of heat treatment costs

Active Publication Date: 2022-03-11
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In short, it is difficult to obtain iron-based superconducting wires with high texture by using existing cold processing processes such as wire drawing and groove rolling.

Method used

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  • Heat treatment device and method for a high-performance iron-based superconducting wire

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The specific process of heat treatment is as follows:

[0031] (1) Take an iron-based superconducting precursor wire with a length of 100 meters and a diameter of 1.5mm, process the head two meters into a diameter of 1.4mm, then put the wire into the pay-off reel 3, and use a drawing die with an aperture of 1.4mm 5, press figure 1 Threading is carried out as shown, through the liquid gallium pool 2, and finally the head of the wire is fixed on the take-up wheel 7.

[0032] (2) Close the door of the vacuum chamber 1, and evacuate; keep the vacuum degree in the vacuum chamber 1 at 10 -4 Pa;

[0033] (3) Turn on the heating module 9, use the constant current mode to heat, and adjust the heating current to make the maximum temperature of the wire reach 850 o C; Subsequently, turn on the driving motor of the take-up wheel 7, so that the moving speed of the wire is kept at 10mm / s; complete the heat treatment process of the wire.

[0034] (4) Replace the drawing die 5 wit...

Embodiment 2

[0039] The specific process of heat treatment is as follows:

[0040] (1) Take an iron-based superconducting precursor wire with a length of 200 meters and a diameter of 1.2mm, process the head two meters into a diameter of 1.14mm, then put the wire into the pay-off reel 3, and use a drawing die with an aperture of 1.14mm 5, press figure 1 Threading is carried out as shown, through the liquid gallium pool 2, and finally the head of the wire is fixed on the take-up wheel 7.

[0041] (2) Close the door of the vacuum chamber 1, and evacuate; keep the vacuum degree in the vacuum chamber 1 at 10 -4 Pa;

[0042] (3) Turn on the heating module 9, use the constant current mode to heat, and adjust the heating current to make the maximum temperature of the wire reach 900 o C; Subsequently, turn on the driving motor of the take-up wheel 7, so that the moving speed of the wire remains at 100mm / s; complete the heat treatment process of the wire.

[0043] (4) Replace the drawing die 5...

Embodiment 3

[0047] The specific process of heat treatment is as follows:

[0048] (1) Take an iron-based superconducting precursor wire with a length of 100 meters and a diameter of 1.5mm, process the head two meters into a diameter of 1.35mm, then put the wire into the pay-off reel 3, and use a drawing die with an aperture of 1.35mm 5, press figure 1 Threading is carried out as shown, through the liquid gallium pool 2, and finally the head of the wire is fixed on the take-up wheel 7.

[0049] (2) Close the door of the vacuum chamber 1, and evacuate; keep the vacuum degree in the vacuum chamber 1 at 10 -4 Pa;

[0050] (3) Turn on the heating module 9, use the constant current mode to heat, and adjust the heating current to make the maximum temperature of the wire reach 950 o C; Subsequently, turn on the driving motor of the take-up wheel 7, so that the moving speed of the wire is kept at 10mm / s; complete the heat treatment process of the wire.

[0051] (4) Replace the drawing die 5 ...

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Abstract

The invention discloses a heat treatment device and method for a high-performance iron-based superconducting wire. The method adopts "roll-to-roll" continuous on-line heating, drawing, and liquid Ga quenching and cooling under vacuum conditions to supercharge the wire. The core wire is heated to near the melting temperature. When the moving speed of the wire is 10-100 mm / s, after 2-3 passes of hot drawing and the shrinkage rate of the wire is 20-50%, the improvement of the iron-based superconductivity can be achieved. The effect of wire texture and core wire density can be used to obtain high-performance iron-based high-temperature superconducting wires. The method is novel, simple, and easy to popularize, and is very suitable for the preparation of industrial kilometer-scale iron-based high-temperature superconducting long wires. The material has great commercial value in the field of high-field superconducting magnets.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of high-temperature superconducting materials for applications in strong magnetic fields, and in particular relates to a heat treatment device and method for high-performance iron-based superconducting wires. Background technique [0002] Since Japanese scientists discovered a new family of iron-based high-temperature superconductors in 2008, the iron-based superconductors that have been discovered include: R E (O,F)FeAs (1111 phase, R E = rare earth elements), M 1-x R x Fe 2 As 2 (122 phases, M =Ba, Sr or Ca, R=K or Na), Fe(Se,Te) (11 phases), Li 1-x FeSe (111 phase), K x Fe 2-y Se 2 and (Li 1−x Fe x ) OHFeSe etc. Among them, the critical transition temperature of 122-phase superconductor T c It can reach 38 K, and the critical current density decays slowly under high field, J c Over 1000 A / mm at 4.2 K, 10 T 2 , on-site magnetic field H c2 (0 K) over 100 T, small ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B12/02H01B12/04
CPCH01B12/02H01B12/04Y02E40/60
Inventor 潘熙锋许涛赵勇
Owner FUJIAN NORMAL UNIV
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