A kind of preparation method of 122-type iron-based compound superconducting wire or strip

A technology of superconducting wires and compounds, which is applied in the usage of superconducting elements, superconducting devices, superconducting/high conducting conductors, etc. Improves current transfer performance, reduces voids and microcracks

Active Publication Date: 2018-07-13
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of low powder packing density and the microscopic cracks introduced in the machining process, the current-carrying performance of the wire strip is seriously affected.
In the currently commonly used heat treatment process, due to the limitation of the melting point of the sheath material, the heat treatment temperature is much lower than the melting point of the iron-based superconducting compound, so the heat treatment still belongs to solid-phase powder sintering, which leads to There may still be a large number of holes and residual cracks [Supercond.Sci.Technol.,2015,28:114005]

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of 122-type iron-based compound superconducting wire or strip
  • A kind of preparation method of 122-type iron-based compound superconducting wire or strip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) In an argon atmosphere inert gas glove box, mix the Sr fragments with a purity of 99.9% and the As powder with a purity of 99.99% according to the atomic ratio of 1:1, put them into a sealed ball mill jar and mix them evenly with a ball mill , and then fill the mixed powder into a corundum crucible in a glove box, then seal the crucible into a vacuum quartz tube, put it into a muffle furnace and sinter at 600 degrees Celsius for 20 hours to obtain the SrAs compound.

[0031] (2) In an argon atmosphere inert gas glove box, mix the K fragments with a purity of 99.9% and the As powder with a purity of 99.99% according to the atomic ratio of 1:1, put them into a sealed ball mill jar and mix them evenly with a ball mill , and then the mixed powder was filled into a corundum crucible in a glove box, and then the crucible was sealed into a vacuum quartz tube, put into a muffle furnace and sintered at 400 degrees Celsius for 5 hours to obtain the KAs compound.

[0032] (3) ...

Embodiment 2

[0038] (1) In an argon atmosphere inert gas glove box, mix the Ba fragments with a purity of 99.9% and the As powder with a purity of 99.99% according to the atomic ratio of 1:1, put them into a sealed ball mill jar and mix them evenly with a ball mill , and then fill the mixed powder into a corundum crucible in a glove box, then seal the crucible into a vacuum quartz tube, put it into a muffle furnace and sinter at 800 degrees Celsius for 10 hours to obtain a BaAs compound.

[0039] (2) In an argon atmosphere inert gas glove box, mix the K fragments with a purity of 99.9% and the As powder with a purity of 99.99% according to the atomic ratio of 1:1, put them into a sealed ball mill jar and mix them evenly with a ball mill , and then filled the mixed powder into a corundum crucible in a glove box, then sealed the crucible into a vacuum quartz tube, put it into a muffle furnace and sintered it at 300 degrees Celsius for 10 hours to obtain the KAs compound.

[0040] (3) In an a...

Embodiment 3

[0046] (1) In an argon atmosphere inert gas glove box, the Ca powder with a purity of 99.9% and the As powder with a purity of 99.99% are proportioned according to an atomic ratio of 1:1, and are mixed evenly with a ball mill after being packed into a sealed ball mill tank, Then, the mixed powder was filled into a corundum crucible in a glove box, and then the crucible was sealed into a vacuum quartz tube, put into a muffle furnace and sintered at 400 degrees Celsius for 50 hours to obtain a SrAs compound.

[0047] (2) In an argon atmosphere inert gas glove box, mix the Na fragments with a purity of 99.9% and the As powder with a purity of 99.99% according to the atomic ratio of 1:1, put them into a sealed ball mill jar and mix them evenly with a ball mill , and then fill the mixed powder into a corundum crucible in a glove box, then seal the crucible into a vacuum quartz tube, put it into a muffle furnace and sinter at 600 degrees Celsius for 1 hour to obtain a NaAS compound. ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to view more

Abstract

The invention relates to a manufacturing method of a 122 type iron-based compound superconducting wire or a belt material. The method comprises the following steps of step1, manufacturing a superconductive-phase initial reactant; step2, according to a chemical formula Ae1-xAkxFe2As2, matching each initial reactants, using a ball grinding mill to carry out ball mill mixing so as to acquire a mixed powder, putting the mixed powder into a metal tube, and using metal plugs to seal two ends of the metal tube; step3, carrying out mechanical molding processing on the metal tube which is filled with the mixed powder so as to make a wire or a belt material; and step4, carrying out heat treatment on the wire or the belt material acquired from the step 3 so that the power in the metal tube is in a melting or partially melting state, and then cooling and acquiring the iron-based compound superconducting wire or the belt material. By using the method, a density of a superconductive phase can be effectively increased, holes and cracks in the superconductive phase are reduced and a density of a critical current flowing through the superconductive wire is increased. By using the method, a technology is simple and feasible, manufacturing cost is low and the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a method for preparing a 122-type iron-based compound superconducting wire or strip. Background technique [0002] Iron-based superconducting materials are new high-temperature superconducting materials following the copper oxide superconductor discovered in 1986. According to the composition ratio and crystal structure of the parent compound, iron-based superconducting materials include several different types, among which the 1111 system (as SmFeAsO 1-x f x Represented) and 122 system (represented by Ba 1-x K x Fe 2 As 2 and Sr 1-x K x Fe 2 As 2 The iron-based superconductors represented by ) have relatively high superconducting transition temperatures (currently the highest are 58K and 38K respectively), and the upper critical fields of both can exceed 100T, and have small anisotropy at the same time. The internal critical current density exceeds 10 6 A / cm 2 , these excellent physical properties show that iron-ba...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): H01B12/02H01B12/04H01B13/00
CPCH01B12/02H01B12/04H01B13/00Y02E40/60
Inventor 姚超马衍伟董持衡
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap