A kind of iron-based superconducting tape and its preparation method

An iron-based superconductor and iron-based superconductor technology, which is applied in the usage of superconductor elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve the problem of easy fracture of superconducting cores, changes in thickness and width of superconducting cores Inhomogeneity, large amount of compression deformation, etc., to achieve the effect of optimizing critical current density, improving superconducting performance, and uniform deformation

Active Publication Date: 2021-08-27
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

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the compression deformation in the middle of the superconducting strip is larger than that in the edge in the prior art, which causes the superconducting core to vary unevenly in thickness and width, and the superconducting core in the middle of the strip is easy to deform. Defects such as fracture occur, thereby providing an iron-based superconducting tape and a preparation method thereof

Method used

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  • A kind of iron-based superconducting tape and its preparation method
  • A kind of iron-based superconducting tape and its preparation method
  • A kind of iron-based superconducting tape and its preparation method

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Effect test

Embodiment 1

[0034] This embodiment provides a single-core iron-based superconducting tape and a preparation method thereof. The preparation method includes the following steps,

[0035] Under an inert atmosphere, the simple substances of iron, potassium, barium and arsenic were mixed and ball-milled and then put into a niobium tube, and calcined for 35 hours at 900°C and 10Mpa to obtain an iron-based superconducting precursor powder (Ba 1-x K x Fe 2 As 2 ), then put the iron-based superconducting precursor powder into the silver tube, seal the two ends with a softer metal, swage, and draw the silver tube filled with the superconducting precursor powder circularly until the diameter of the iron-based superconducting wire is 2.1mm, and then use the square mold in Table 1 to draw the iron-based superconducting wire in a square shape until a square strip with a side length of 1.45mm and a rounded corner of 0.2mm is formed, and then roll it into a side length of 4mm and 0.3mm thick strips, ...

Embodiment 2

[0040] This embodiment provides a multi-core iron-based superconducting tape and a preparation method thereof. The preparation method includes the following steps,

[0041]Under an inert atmosphere, the simple substances of iron, potassium, barium and arsenic were mixed and ball-milled, put into a niobium tube, and calcined at 650 °C and 50 MPa for 10 h to obtain an iron-based superconducting precursor powder (Ba 1-x K x Fe 2 As 2 ), then put the iron-based superconducting precursor powder into the silver tube, seal the two ends with a softer metal, swage, and draw the silver tube filled with the superconducting precursor powder circularly until the diameter of the iron-based superconducting wire is 1.96mm, and then cut the round wire strip into 7 sections of the same length, and wipe it clean to obtain 7 superconducting cores, and then put them into a copper-silver alloy metal tube with an inner diameter of 6mm and an outer diameter of 8mm, Obtain composite wire;

[0042]...

Embodiment 3

[0044] This embodiment provides a single-core iron-based superconducting tape and a preparation method thereof. The preparation method includes the following steps,

[0045] Under an inert atmosphere, the simple substances of iron, sodium and arsenic were mixed and ball-milled and put into a niobium metal tube, and calcined for 35 hours at 900°C and 10Mpa to obtain iron-based superconducting precursor powder (NaFeAs), and then the iron-based superconducting precursor Put the powder into the silver tube, seal both ends with a softer metal, swage, and draw the silver tube filled with superconducting precursor powder circularly until the diameter of the iron-based superconducting wire is 1.95mm, and then use a square mold to shape the iron tube. The base superconducting wire is drawn in a square until a square strip with a side length of 1.55 mm and a rounded corner of 0.3 mm is formed, and then rolled into a strip with a side length of 3.8 mm and a thickness of 0.3 mm, and then r...

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Abstract

The invention belongs to the technical field of iron-based superconductors, and in particular relates to an iron-based superconducting tape and a preparation method thereof. The method comprises the steps of swaging, circular drawing, square drawing, rolling and sintering the iron-based superconducting precursor powder in an inert atmosphere to obtain the iron-based superconducting strip. In the prior art, the processing process of superconducting materials is in the form of round wires. The present invention changes the cross-sectional shape of the superconducting material by adopting square drawing, so that the cross-sectional shape forms a square shape before rolling. Make the upper and lower sides of the superconducting strip contact the roll at the same time, the deformation of the middle and edge of the superconducting strip is the same, the deformation of the superconducting core is also more uniform, and there will be no fracture of the central superconducting core and non-densification of the edge superconducting core , The problem of low phase texture improves the superconducting performance of the superconducting tape; this processing method that makes the superconducting core more uniformly deformed makes it possible to prepare long wires with higher uniformity.

Description

technical field [0001] The invention belongs to the technical field of iron-based superconductors, and in particular relates to an iron-based superconducting tape and a preparation method thereof. Background technique [0002] Iron-based superconducting material is a new type of high-temperature superconducting material discovered by Japanese scientist Hosono in 2008. So far, four different iron-based superconducting material systems have been discovered: (1) "11" system, mainly including FeSe, FeTe, etc.; (2) "111" system, mainly including AFeAs (A=Li, Na ), etc.; (3) "122" system mainly includes AFeAs (A=Ba, Sr, K, Ca, Eu), etc.; (4) "1111" system mainly includes LnOFeAs (Ln=La, Ce, Pr, Nd , Sm, Gd, Tb, Dy, Ho, Y) and DvOFeAs (Dv=Ca, Sr), etc., are also systems with the highest iron-based superconducting transition temperature (55K). [0003] Compared with traditional superconducting materials, iron-based superconducting materials have the advantages of high upper critic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B12/02H01B12/06
CPCH01B12/02H01B12/06Y02E40/60
Inventor 刘聪马衍伟张现平王栋樑
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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