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
CN110867283AActive Publication Date: 2020-03-06NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
Publication Date
2020-03-06

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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.
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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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