High-performance iron-based superconducting strip and preparation process thereof

A technology of iron-based superconductivity and preparation process, which can be used in the manufacture of superconducting devices, superconducting/high-conducting conductors, cables/conductors, etc. Fully controllable size and deformation, improved current-carrying properties, high texture and density

Inactive Publication Date: 2019-06-28
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

[0004] Therefore, the purpose of the present invention is to solve the technical problem that the superconducting core density cannot be effectively improved due to flat roll rolling in the preparation method of the iron-based superconducting wire strip, thereby providing a high-performance iron-based superconducting strip and its Preparation Process

Method used

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  • High-performance iron-based superconducting strip and preparation process thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0030] Single core Ba 0.6 K 0.4 Fe 2 As 2 The preparation of superconducting wire tape, the steps are as follows:

[0031] (1) Under the atmosphere of argon gas, metal barium shavings (mass purity is 99.50%), potassium block (mass purity is 99.95%), iron powder (mass purity is 99.99%) and arsenic particles (mass purity is 99.95%) ), after accurately weighing according to the molar ratio Ba:K:Fe:As=0.6:0.4:2:2, put it into a ball mill jar and ball mill it for 10 hours to make the powder mix evenly. Put the ball-milled powder into the Nb tube, seal both ends with copper plugs, and then heat-treat at 900°C for 50 hours to obtain the precursor powder for preparing superconducting wire strips.

[0032] (2) Fill the prepared precursor powder into a silver tube with a length of 10 cm. The inner diameter of the silver tube is 5 cm and the outer diameter is 8 cm. Seal the two ends with Nb plugs to obtain a tube complex, and squeeze the tube complex A single-core wire with a diamet...

Embodiment 2

[0044] 7 core Ba 0.6 K 0.4 Fe 2 As 2 The preparation of superconducting wire tape, the steps are as follows:

[0045] (1) Under the atmosphere of argon gas, metal barium shavings (mass purity is 99.50%), potassium block (mass purity is 99.95%), iron powder (mass purity is 99.99%) and arsenic particles (mass purity is 99.95%) ), according to the molar ratio Ba:K:Fe:As=0.6:0.4:2:2 after accurate weighing, put into the ball mill jar and ball mill for 10h, put the ball milled powder into the Nb tube, and seal it with a copper plug Heat treatment is carried out after both ends, the temperature of the heat treatment is 950° C., and the temperature is kept for 35 hours, and finally the precursor powder for preparing the superconducting wire tape is obtained.

[0046] (2) Fill the prepared precursor powder into a silver tube with a length of 30 cm. The inner diameter of the silver tube is 4 cm and the outer diameter is 5 cm. Seal the two ends with Nb plugs to obtain a tube complex...

Embodiment 3

[0061] 37 core Ba 0.6 K 0.4 Fe 2 As 2 The preparation of superconducting wire tape, the steps are as follows:

[0062] (1) Under the atmosphere of argon gas, metal barium shavings (mass purity is 99.50%), potassium block (mass purity is 99.95%), iron powder (mass purity is 99.99%) and arsenic particles (mass purity is 99.95%) ), according to the molar ratio Ba:K:Fe:As=0.6:0.5:2:2 after accurate weighing, put into the ball mill jar and ball mill for 10h, put the ball milled powder into the Nb tube, and seal it with a copper plug Heat treatment is carried out after both ends, the temperature of the heat treatment is 900° C., and the temperature is kept for 35 hours, and finally the precursor powder for preparing the superconducting wire tape is obtained.

[0063] (2) Fill the prepared precursor powder into a silver tube with a length of 80 cm. The inner diameter of the silver tube is 6 cm, and the outer diameter is 8 cm. Seal the two ends with Nb plugs to obtain a tube compl...

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Abstract

The invention discloses a high-performance iron-based superconducting strip and a preparation process thereof. The process in particular comprises steps of preparing an iron-based superconductor precursor powder; injecting the precursor powder into a metal pipe to obtain a pipe-loaded composite body, and obtaining a single-core wire by extruding and drawing; cutting the single-core wire into a plurality of equal-length single-core wires, loading the equal-length single-core wires into the metal pipe to form a multi-core composite pipe, and obtaining multi-core wires by extruding and drawing; performing four-roller rolling on the single-core wires or multi-core wires to obtain a single-core strip or multi-core strip; and obtaining the high-performance iron-based superconducting strip afterthe heat treatment of the single-core strip or the multi-core strip. The multi-core strip is prepared by four-roll rolling, is subjected to the uniform pressing force in four directions, which obviously increases the density of the superconducting strip, and obtains high textured degree and density while ensuring the superconducting core of the strip. Thus, the current carrying property of the strip is improved, and the critical transfer current and the critical engineering current density of the superconducting strip are improved.

Description

technical field [0001] The invention relates to the technical field of superconducting material processing engineering, in particular to a high-performance iron-based superconducting tape and a preparation process thereof. Background technique [0002] Iron-based superconductors have the advantages of high critical field, large coherence length, small anisotropy, simple preparation process, etc., and have great application prospects in the field of high magnetic field applications. At present, the critical current density of iron-based superconducting tape has exceeded 1.5×10 5 A / cm 2 (4.2K, 10T), reaching the practical level. At the same time, breakthroughs have also been made in the preparation of long iron-based superconducting wires of the order of 100 meters, and the critical current density of the long wires has been higher than 2×10 4 A / cm 2 (4.2K, 10T), which can be used to carry out research on superconducting device prototypes. [0003] Due to the advantages o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B12/02H01B12/04H01B13/00
CPCY02E40/60
Inventor 张现平马衍伟王栋樑姚超董持衡徐中堂
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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