Simple preparation method for iron-based superconducting wire/tape

An iron-based superconductor and wire-tape technology is applied to the simple preparation of iron-based superconducting wire strips and the field of copper-clad iron-based superconducting wire strips, which can solve the difficulty of preparing high-performance samples, forging and drawing and other problems, to achieve the effect of high critical transition temperature and high purity

Inactive Publication Date: 2012-07-04
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, since iron-based superconductors contain many types of elements, it is difficult to prepare high-performance samples. In addition, iron-based superconductors are ceramic structures, which are very brittle, and it is difficult to forge and draw them into the desired shape after firing. shape

Method used

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  • Simple preparation method for iron-based superconducting wire/tape
  • Simple preparation method for iron-based superconducting wire/tape

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: copper casing SmO 0.8 f 0.2 Preparation of FeAs Superconducting Wire

[0018] Step 1: Preparation of initial powder

[0019] Sm powder and As powder were weighed according to the molar ratio of 1:1.03 and mixed under Ar protective atmosphere. The mixed Sm powder and As powder were packaged in a quartz tube for sintering, and the vacuum degree was 10 -6 Pa, the heat treatment process is as follows: from room temperature to 400°C, the heating rate is 5°C / min; from 400°C to 600°C, the heating rate is 1°C / min; at 600°C for 5 hours; from 600°C to 900°C, the heating rate is 1°C / min; heat preservation at 900°C for 10 hours; finally cool the furnace to room temperature.

[0020] Step 2: Copper casing SmO 0.8 f 0.2 Preparation of FeAs Superconducting Wire

[0021] In a glove box protected by high-purity argon gas, SmAs powder, Fe powder, Fe 2 o 3 Powder, FeF 3 The powder is mixed according to the ratio of 30:12:8:2.4; then it is fully ground; the ground raw...

Embodiment 2

[0022] Example 2: copper casing PrO 0.8 f 0.2 Preparation of FeAs Superconducting Wire

[0023] Step 1: Preparation of initial powder

[0024] The Pr powder and As powder were weighed according to a molar ratio of 1:1 and mixed under an Ar protective atmosphere. The mixed Pr powder and As powder were packaged in a high-vacuum quartz tube for sintering, and the vacuum degree of the quartz tube was 10 -4 Pa, the heat treatment process is as follows: room temperature-400°C, heating rate is 5°C / min; 400°C-600°C, heating rate is 5°C / min; 600°C for 10 hours; 600°C-900°C heating rate is 5°C / min; heat preservation at 900°C for 20 hours; finally cool the furnace to room temperature.

[0025] Step 2: Copper casing PrO 0.8 f 0.2 Preparation of FeAs Superconducting Wire

[0026] In a high-purity argon-protected glove box, PrAs powder, Fe powder, Fe 2 o 3 Powder, FeF 3 The powder is mixed according to the ratio of 30:12:8:2.4; then it is fully ground; the sample after grinding i...

Embodiment 3

[0027] Example 3: Copper casing CeO 0.8 f 0.2 Preparation of FeAs Superconducting Wire

[0028] Step 1: Preparation of initial powder

[0029]Ce powder and As powder were weighed according to the molar ratio of 1:1 and mixed under Ar protective atmosphere. The mixed Ce powder and As powder are packaged in a high-vacuum quartz tube for sintering, and the vacuum degree of the quartz tube is 10 -4 Pa, the heat treatment process is as follows: room temperature-400°C, heating rate is 5°C / min; 400°C-600°C, heating rate is 5°C / min; 600°C for 10 hours; 600°C-900°C heating rate is 5°C / min; heat preservation at 900°C for 20 hours; finally cool the furnace to room temperature.

[0030] Step 2: Copper sleeve CeO 0.8 f 0.2 Preparation of FeAs Superconducting Wire

[0031] In a glove box protected by high-purity argon gas, CeAs powder, Fe powder, Fe 2 o 3 Powder, FeF 3 The powder is mixed according to the ratio of 30:12:8:2.4; then it is fully ground; the sample after grinding is...

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Abstract

A simple preparation method for an iron-based superconducting wire/tape belongs to the technical field of superconducting wires/tapes. Under high-purity Ar, rare earth powder and As powder are uniformly mixed in a quartz tube to prepare LnAs through heat treatment; under the protection of high-vacuum or high-purity argon gas, LnAs, Fe powders, Fe2O3 powders and FeF3 powders are matched and grinded in a molar ratio of 3:(1+x):(1-x):(1.1-1.5)x, and then are encapsulated in a copper pipe to prepare a wire/tape; the prepared wire/tape is subject to annealing processing under the high-vacuum environment of (10-4)-(10-6)Pa; and finally, the LnO1-xFxFeAs superconducting wire/tape is prepared. According to the method provided by the invention, the forming is easy, and the high-quality iron-based superconducting wire/tape can be prepared, with reduced preparation cost and improved production efficiency.

Description

technical field [0001] The invention relates to a simple preparation method of iron-based superconducting wire strips, in particular to a method for copper-clad iron-based superconducting wire strips, and belongs to the technical field of superconducting wire strips. Background technique [0002] Iron-based superconductors have good electromagnetic properties. Compared with traditional low-temperature metal and alloy superconductors, iron-based superconductors have a higher operating temperature range, 40-60K, and can use a refrigerator to reach their superconducting transition temperature, with relatively low operating costs; and oxide high-temperature YBCO-coated superconductors Compared with the Bi-based superconducting wire strip, the material has higher upper critical field and irreversible field, and its upper critical field can exceed 150T at 0K, and the iron-based superconductor has a simple preparation process, so the appearance of the iron-based superconducting mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B12/04
CPCY02E40/641Y02E40/60
Inventor 索红莉刘志勇马麟王毅刘敏郭志超闫镔杰徐燕
Owner BEIJING UNIV OF TECH
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