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A Processing Technology for Improving the Properties of Iron-based Compound Superconducting Tape

A technology of superconducting tape and processing technology, which is applied in the manufacture of superconducting devices, superconducting/high-conducting conductors, and cables/conductors. , the effect of performance improvement is obvious

Active Publication Date: 2019-09-06
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of cracking of the superconducting core caused by unidirectional rolling (i.e. flat roll rolling) in the preparation of the iron-based compound superconducting multi-core wire strip, and to provide a method to improve the iron-based compound superconducting multi-core wire strip. The processing technology of superconducting strip properties, using the same simple repeated rolling process, can obtain multi-core strips with more complete superconducting cores, and at the same time improve the current-carrying performance of the strips. The preparation of core long wire has important reference significance

Method used

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  • A Processing Technology for Improving the Properties of Iron-based Compound Superconducting Tape
  • A Processing Technology for Improving the Properties of Iron-based Compound Superconducting Tape
  • A Processing Technology for Improving the Properties of Iron-based Compound Superconducting Tape

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Single core Ba 0.6 K 0.4 Fe 2 As 2 Preparation of superconducting wire tape

[0027] 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 Molar ratio Ba:K:Fe:As=0.6:0.4:2:2 After accurate weighing, put into ball mill jar and ball mill for 10 hours. 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;

[0028] 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. Then both ends were sealed with Nb plugs to obtain a tube-packing complex; the tube-packing complex was drawn to obtain a single-core wire with a diameter of 1.90 mm, and the pass processing rate was 10%....

Embodiment 2

[0032] Single core Ba 0.6 K 0.4 Fe 2 As 2 Preparation of superconducting wire tape

[0033]Under the atmosphere of argon gas, metal strontium 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 Molar ratio Sr:K:Fe:As=0.6:0.4:2:2 After accurate weighing, put into ball mill jar and ball mill for 10 hours. Put the ball-milled powder into the Nb tube, seal both ends with copper plugs, and then heat-treat at 890°C for 30 hours to obtain the precursor powder for preparing superconducting wire strips;

[0034] 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. Then both ends were sealed with Nb plugs to obtain a tube-packing complex; the tube-packing complex was drawn to obtain a single-core wire with a diameter of 1.90 mm, and the pass processing rate was 10...

Embodiment 3

[0038] Single core Ba 0.58 K 0.4 Fe 2 As 2.1 Preparation of superconducting wire tape

[0039] 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 Molar ratio Ba:K:Fe:As=0.58:0.4:2:2.1 After accurate weighing, put into ball mill jar and ball mill for 10 hours. Put the ball-milled powder into the Nb tube, seal both ends with copper plugs, and then heat-treat at 900°C for 40 hours to obtain the precursor powder for preparing superconducting wire strips;

[0040] Fill the prepared precursor powder into a silver-manganese alloy tube with a length of 10 cm. The inner diameter of the silver-manganese alloy tube is 5 cm and the outer diameter is 8 cm. Then both ends were sealed with Nb plugs to obtain a tube-packing complex; the tube-packing complex was drawn to obtain a single-core wire with a diameter of 1.90 mm,...

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Abstract

The invention relates to a processing technology for improving performance of a Fe-based compound superconductive tape. The processing technology for improving performance of a Fe-based compound superconductive tape includes the steps: preparing Fe-based superconductor precursor powder; filling a sheath with the precursor powder to obtain a tube-loading composite; drawing the tube-loading composite into a single-core wire; cutting the single-core wire into a plurality of identical short samples, inserting the identical short samples into the outer sheath to obtain a multi-core composite tube;after the composite tube is drawn into a wire of a certain diameter, repeatedly rolling the wire (during the rolling process, the two ends of the samples are bitten into the roller in turn), and thenobtaining a multi-core tape with certain thickness; and under an Ar atmosphere at 500 to 1100 DEG C, performing final thermal treatment on the obtained Fe-based multi-core tape. Compared with a multi-core tape obtained by a unidirectional rolling technology, the multi-core tape obtained by the processing technology for improving performance of a Fe-based compound superconductive tape through the repeated rolling mode has no cracking phenomenon in each superconductive core of the multi-core tape, and the integrity of the superconductive core is preferable, and the critical transmission currentIc of the tape and the critical engineering current density Je of the tape are significantly improved.

Description

technical field [0001] The invention relates to a processing technique for improving the properties of iron-based compound superconducting strips. Background technique [0002] Since its discovery in 2008, iron-based compound superconducting materials have attracted the exploration of a large number of scientific and technological workers. Compared with oxide high-temperature superconducting materials, iron-based superconductors have simpler crystal structures, larger coherence lengths, smaller anisotropy, and simpler preparation processes. Therefore, the preparation of iron-based superconducting materials has attracted widespread international attention. At present, the critical transport current density of this type of iron-based superconductor in the world has exceeded 10 5 A / cm 2 [Hot pressing to enhance the transport Jc of Sr 0.6 K 0.4 Fe 2 As 2 superconducting tapes, Scientific Reports, 4, 6944 (2014)], indicating that the performance of iron-based superconductor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B13/00H01B12/02B21C37/04
Inventor 马衍伟徐光显张现平王栋梁
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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