Preparation method of FeSe-based superconducting wire

A technology for superconducting wires and wires, which is applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc. flow properties and the effect of increasing the superconducting phase content

Active Publication Date: 2020-03-06
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the current preparation process of FeSe polycrystalline wire ribbon, the formation of hexagonal non-superconducting phase at the superconducting phase grain boundary cannot be avoided, resulting in a decrease in the intergranular connectivity of the system; at the same time, the superconducting phase lattice internal The existence of interstitial iron also inhibits the superconductivity of FeSe to a certain extent. Therefore, from these two perspectives, while increasing the content of FeSe superconducting phase inside the core wire, a low-oxygen annealing process is introduced to promote the superconductivity of interstitial iron. Precipitation, improve the overall superconductivity of the system

Method used

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  • Preparation method of FeSe-based superconducting wire
  • Preparation method of FeSe-based superconducting wire
  • Preparation method of FeSe-based superconducting wire

Examples

Experimental program
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Effect test

Embodiment 1

[0039] This embodiment includes the following steps:

[0040] Step 1. Clean and dry an iron pipe with an outer diameter of 12 mm, an inner diameter of 10 mm and a wall thickness of 1 mm, an iron rod with a diameter of 4.20 mm, and an iron plug in sequence, and place them in an argon-protected glove box, and then Assembling by using a thermal assembly method to obtain a pipe-loading complex; the specific process of the assembly is: using a thermal assembly method to closely assemble one end of the iron rod with an iron plug, and then using a thermal assembly method to assemble with the iron pipe, Make the iron pipe tightly assembled with the iron plug tightly assembled at one end of the iron rod, and ensure that the centerline of the iron rod and iron pipe coincides, and then use the vibration filling method to fill the gap formed by the iron pipe and the iron rod. powder, and plug the upper end of the iron pipe with an iron plug, the vibration frequency of the vibration table ...

Embodiment 2

[0047] This embodiment includes the following steps:

[0048] Step 1. Clean and dry an iron pipe with an outer diameter of 15mm, an inner diameter of 12mm and a wall thickness of 1.5mm, an iron rod with a diameter of 4.20mm, and an iron plug in sequence, and place them in an argon-protected glove box. Then use the thermal assembly method to assemble to obtain the pipe-loading complex; the specific process of the assembly is: use the thermal assembly method to closely assemble one end of the iron rod with an iron plug, and then use the thermal assembly method to assemble with the iron pipe , so that the iron pipe and the iron plug tightly assembled at one end of the iron rod can be tightly assembled, and the centerline of the iron rod and the iron pipe should be coincident, and then the gap formed by the iron pipe and the iron rod should be filled by the vibration filling method Se powder, and plug the upper end of the iron pipe with an iron plug, the vibration frequency of the...

Embodiment 3

[0054] This embodiment includes the following steps:

[0055] Step 1. Clean and dry an iron pipe with an outer diameter of 8mm, an inner diameter of 5mm and a wall thickness of 1.5mm, an iron rod with a diameter of 2.20mm, and an iron plug in sequence, and place them in an argon-protected glove box. Then use the thermal assembly method to assemble to obtain the pipe-loading complex; the specific process of the assembly is: use the thermal assembly method to closely assemble one end of the iron rod with an iron plug, and then use the thermal assembly method to assemble with the iron pipe , so that the iron pipe and the iron plug tightly assembled at one end of the iron rod can be tightly assembled, and the centerline of the iron rod and the iron pipe should be coincident, and then the gap formed by the iron pipe and the iron rod should be filled by the vibration filling method Se powder, and plug the upper end of the iron pipe with an iron plug, the vibration frequency of the vib...

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Abstract

The invention discloses a preparation method of a FeSe-based superconducting wire. The method comprises the following steps: 1, assembling an iron tube, an iron rod and an iron plug to obtain a tubingcomplex; 2, sealing the two ends of the tubing complex, and then obtaining a single-core FeSe-based wire through rotary swaging and drawing in sequence; 3, sintering the single-core FeSe-based wire to obtain a FeSe-based wire; and 4, annealing the FeSe-based wire to obtain a FeSe-based superconducting wire. According to the invention, the single-core FeSe-based wire is formed through powder charging by adopting a vibration tubing method and cold processing, and the iron rod diffuses into the molten Se powder in the subsequent sintering process to generate a compact FeSe layer and form a central hole, so that the intergranular connectivity is improved; and the oxidizing atmosphere is introduced through the central hole to be in full contact with the FeSe-based superconducting phase for annealing, so that the precipitation of interstitial iron is promoted, the superconductivity of the FeSe-based superconducting wire is improved, and the current-carrying performance of the FeSe-based superconducting wire is further improved.

Description

technical field [0001] The invention belongs to the technical field of superconducting materials, and in particular relates to a preparation method of FeSe-based superconducting wires. Background technique [0002] Since 2008, the Japanese Hosono research group reported LaO with a critical temperature of 26K. 1-x f x After FeAs, Fe-based superconducting materials (IBS) developed rapidly. Under the leadership of Chinese scientists, more and more Fe-based superconducting materials have been reported, and their critical temperature has gradually increased. At present, the highest can reach 65K, which is recognized by scientists as the most potential system that can achieve a breakthrough in the superconducting mechanism. So far, iron-based superconducting materials have developed a number of systems, mainly iron-arsenic-based and iron-selenium-based according to the different superconducting layers. Among them, the iron-arsenic base can be divided into "1111" system (such as...

Claims

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Application Information

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IPC IPC(8): H01B12/00C21D1/26C21D9/52C21D1/74
CPCC21D1/26C21D1/74C21D9/525H01B12/00Y02E40/60
Inventor 张胜楠邵柏淘刘吉星冯建情李成山张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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