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Preparation method of composite sheathed iron-based superconducting wire strip

An iron-based superconducting and sheathing technology, which is applied in superconducting devices, superconducting/high-conducting conductors, cable/conductor manufacturing, etc., can solve the problems of low product yield, high production cost, and large bulging, and achieve Reduce production costs, excellent product performance, and eliminate bulges

Inactive Publication Date: 2019-06-18
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem that when the iron-based superconducting wire strip is produced by the powder packing method in the prior art, it is easy to bring a large number of bulges, the product yield is low, and the actual production process requires a relatively large pressure, resulting in excessive production costs. high, thus providing a method for preparing a composite sheathed iron-based superconducting wire strip

Method used

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  • Preparation method of composite sheathed iron-based superconducting wire strip
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  • Preparation method of composite sheathed iron-based superconducting wire strip

Examples

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Embodiment 1

[0032] This embodiment provides a single-core copper-silver composite LaFeAsO 0.76 f 0.24 A method for preparing a superconducting wire strip, comprising the steps of:

[0033] 1) Under an Ar gas protective atmosphere, accurately weigh a total of 20 g of the iron-based superconducting raw materials La, Fe, As, O, and F according to the above stoichiometric ratio, and then put the weighed raw materials into a planetary ball mill for 10 milliseconds. hours to turn it into a powder. Put the ground powder into the Nb tube, seal both ends with copper plugs, and then heat-treat and sinter. The sintering time is 1 hour, the sintering temperature is 900°C, and the sintering pressure is normal pressure, and finally LaFeAsO is obtained.0.76 f 0.24 , crush it into powder to obtain iron-based superconducting precursor powder;

[0034] 2) The iron-based superconducting precursor powder obtained in step 1) is packed into an Ag tube, and both ends of the Ag tube are sealed. Under an argon...

Embodiment 2

[0038] Single core copper-silver composite SmFeAsO 0.76 f 0.24 A method for preparing a superconducting wire strip, comprising the steps of:

[0039] 1) Under the protective atmosphere of Ar gas, accurately weigh a total of 20 g of the iron-based superconducting raw material elements Sm, Fe, As, O, and F according to the above stoichiometric ratio, and then put the weighed elemental materials into a planetary ball mill for ball milling for 10 hours to turn it into a powder. Put the ground powder into the Nb tube, seal both ends with copper plugs, and then heat-treat and sinter. The sintering time is 200 hours, the sintering temperature is 500°C, and the sintering pressure is normal pressure, and finally SmFeAsO is obtained. 0.76 f 0.24 , crush it into powder to obtain iron-based superconducting precursor powder;

[0040] 2) The iron-based superconducting precursor powder obtained in step 1) is packed into an Ag tube, and both ends of the Ag tube are sealed. Under an argon ...

Embodiment 3

[0044] Single core copper silver composite Ba 0.6 K 0.4 Fe 2 As 2 A method for preparing a superconducting wire strip, comprising the steps of:

[0045] 1) Under an Ar gas protective atmosphere, accurately weigh a total of 20 g of the iron-based superconducting raw materials Ba, K, Fe, and As according to the above stoichiometric ratio, and then put the weighed raw materials into a planetary ball mill for ball milling for 10 hours, make it into powder. Put the ground powder into the Nb tube, seal both ends with copper plugs, and then heat-treat and sinter. The sintering time is 35 hours, the sintering temperature is 900°C, and the sintering pressure is normal pressure, and finally Ba 0.6 K 0.4 Fe 2 As 2 , crush it into powder to obtain iron-based superconducting precursor powder;

[0046] 2) The iron-based superconducting precursor powder obtained in step 1) is packed into an Ag tube, and both ends of the Ag tube are sealed. Under an argon atmosphere, the Ag tube equip...

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Abstract

The invention relates to the technical field of iron-based superconductors, in particular to a preparation method of a composite sheathed iron-based superconducting wire strip. The preparation methodof the composite sheathed iron-based superconducting wire strip provided by the invention comprises a step of carrying out first heat treatment on iron-based superconducting precursor powder in an inert atmosphere. According to the method, the iron-based superconducting precursor powder placed into an inner sheath metal tube is subjected to pre-heat treatment in the inert atmosphere, so that bumpscan be effectively eliminated, and the product yield is improved.

Description

technical field [0001] The invention relates to the technical field of iron-based superconductors, in particular to a method for preparing a composite sheathed iron-based superconductor strip. Background technique [0002] Iron-based superconductors are the second type of superconductors discovered in early 2008, which led to another revolutionary advance in the frontier of superconductivity in the world. At present, its highest superconducting critical temperature is 55K. According to the composition ratio and crystal structure of superconducting core compounds, iron-based superconducting materials are mainly divided into the following four major systems: (1) "1111" system, members include LnOFeAs (Ln=La, Ce, Pr, Nd, Sm, Gd , Tb, Dy, Ho, Y) and DvFeAsF (Dv=Ca, Sr), etc.; (2) "122" system, members include AFe 2 As 2 (A=Ba, Sr, K, Ca, Eu), etc.; (3) "111" system, members include AFeAs (A=Li, Na), etc.; (4) "11" system, members include FeSe(Te), etc. . [0003] Compared w...

Claims

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Application Information

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IPC IPC(8): H01B12/02H01B13/00B22F7/08
Inventor 马衍伟李柳
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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