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Method for improving performance of iron-based superconducting wires and strips by using high-energy particle irradiation

An iron-based superconducting and high-energy particle technology, applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc. Strip and other problems, to achieve the effect of increasing the irreversible field and critical current density, increasing the magnetic flux pinning force, and increasing the magnetic flux pinning force

Active Publication Date: 2017-09-19
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the irradiation process suitable for iron-based superconducting single crystals cannot be directly applied to iron-based superconducting wires and strips

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] First prepare Sr 0.6 K 0.4 Fe 2 As 2 The precursor powder is filled in an Ag tube, and a single-core Ag sheathed superconducting tape is prepared through a process flow of swaging, drawing, and rolling. After annealing at a high temperature of 880 degrees, the reuse energy is 10MeV and the dose is 10 15 protons / cm 2 The protons irradiate the strip. The critical current density of the strip is measured by the four-lead method. The critical current density of the strip after high temperature annealing at 4.2K and 10T is 3×10 4 A / cm 2 , And the critical current density of the strip after irradiation is increased to 6.3×10 4 A / cm 2 . In addition, the irreversible field at 33K of the strip after irradiation is 0.5T higher than that of the strip before irradiation.

Embodiment 2

[0019] Preparation of SmFeAsO 0.8 F 0.2 The precursor powder is filled in the Ag tube, and the seven-core Ag sheathed superconducting tape is prepared through the process flow of rotary forging, drawing, refilling, drawing, and rolling. After annealing at a high temperature of 1100 degrees, the reuse energy is 10KeV and the dose is 10 20 neutrons / cm 2 The neutrons irradiate the strip.

Embodiment 3

[0021] First prepare Ba 0.6 K 0.4 Fe 2 As 2 The precursor powder is filled in an Ag tube, and a single-core Ag sheathed superconducting tape is prepared by swaging, drawing, and rolling. After annealing at 880 degrees and 30Mpa pressure, the reuse energy is 38MeV and the dose is 10 11 ions / cm 2 The Alpha particles irradiate the tape. The critical current density of the strip is measured by the four-lead method, and it is found that the critical current density of the strip after hot pressing is 1.2×10 at 4.2K and 10T. 5 A / cm 2 , The pinning force is 12GN / m 3 . The critical current density of the irradiated strip is increased to 2.1×10 5 A / cm 2 , The pinning force reaches 21GN / m 3 .

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Abstract

The invention relates to a method for improving the performance of iron-based superconducting wires and strips by using high-energy particle irradiation. The method specifically comprises the steps of (a) preparing iron-based superconducting wires and strips by adopting a powder tubing method; (b) performing heat treatment on the iron-based superconducting wires and strips; (c) irradiating the heat treated iron-based superconducting wires and strips by using high-energy particles. The particles used by irradiation comprise ions with electron, neutron or atomic numbers being 1-92, the energy of the particles used by irradiation is 10keV-100GeV, and the dose of the particles used by irradiation is 10<6>-10<20> particles / cm<2>. According to the invention, a lot of defects can be introduced in superconducting cores of the iron-based superconducting wires and strips, so that the flux pining capacity is enhanced, and the irreversible field and critical current density of the iron-based superconducting wires and strips are effectively improved.

Description

Technical field [0001] The invention relates to a method for improving the performance of iron-based superconducting wires and strips by high-energy particle irradiation. Background technique [0002] The iron-based superconducting material discovered by Japanese scientists in 2008 has high upper critical field, low anisotropy and high superconducting transition temperature, and has broad application prospects in superconducting power transmission, superconducting magnets and other fields. Due to the high brittleness of iron-based superconducting materials and the difficulty of plastic processing, the powder filling method (PIT method) has become the preferred technical way to prepare iron-based superconducting wires and strips. The powder tube filling method is a method of filling iron-based superconducting precursor powder in a metal tube, and then preparing the metal tube into wire or strip through cold working procedures such as swaging, drawing, and rolling. It has been wide...

Claims

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Application Information

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IPC IPC(8): H01B13/00H01B12/00
CPCH01B12/00H01B13/0016H01B13/003Y02E40/60
Inventor 董持衡马衍伟张现平王栋樑姚超
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI