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Preparation method of bismuth-based high-temperature superconducting material

A superconducting material, bismuth-based technology, applied in the field of preparation of bismuth-based high-temperature superconducting materials, can solve the problem of reducing the quality and electrical properties of bismuth-based high-temperature superconducting thin films, difficulty in achieving large-scale industrial production, and chemical ratio deviation from phase formation Interval and other issues to achieve the effect of improving quality and electrical properties, increasing critical current density, and improving c-axis texture

Active Publication Date: 2017-08-11
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of using the vacuum method to prepare bismuth-based high-temperature superconducting materials is in-situ growth, and the bismuth-based high-temperature superconducting thin film has fewer defects and good quality; the disadvantage is that the introduction of vacuum equipment increases costs, and it is difficult to achieve large-scale industrial production
There are few methods for preparing bismuth-based high-temperature superconducting thin films by non-vacuum methods. The reason is that there is a high-temperature sintering process in the preparation of bismuth-based high-temperature superconducting thin films. During the high-temperature sintering process, volatilization of elements will result in the stoichiometric ratio of each element. Deviate from the phase interval of the bismuth-based high-temperature superconducting thin film, thereby forming a wider phase interval and other second phases, reducing the quality and electrical properties of the bismuth-based high-temperature superconducting thin film

Method used

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  • Preparation method of bismuth-based high-temperature superconducting material
  • Preparation method of bismuth-based high-temperature superconducting material

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preparation example Construction

[0013] see figure 1 , the embodiment of the present invention provides a method for preparing a bismuth-based high-temperature superconducting material, the method comprising the following steps:

[0014] S10, providing a base tape 1 and a bismuth-based superconducting solution, coating the bismuth-based superconducting solution on the base tape 1, thereby forming a precursor thin film 2 on the base tape 1;

[0015] S20, performing heat treatment on the base tape 1 formed with the precursor film 2 to pyrolyze the precursor film 2, thereby forming a pyrolysis film 3 on the base tape 1;

[0016] S30, forming a barrier layer 4 on the surface of the pyrolysis film 3, thereby forming a precursor structure 5;

[0017] S40, sealing the precursor structure 5;

[0018] S50, performing heat treatment on the sealed precursor structure 5 to obtain the bismuth-based high-temperature superconducting material.

[0019] In the step S10 , the material of the base tape 1 is a material with g...

Embodiment 1

[0053] Embodiment 1 of the present invention provides a method for preparing a high-performance Bi-2223 bismuth-based high-temperature superconducting tape.

[0054] (a) Preparation of bismuth-based superconducting solution

[0055] The preparation method of the bismuth-based high-temperature superconducting solution of the Bi-2223 is: weigh 2.23 grams of Bi(NO) 3 ·5H 2 O, 0.32 g of Pb(CH 3 COO) 2 ·3H 2 O, 1.03 g of Sr(NO 3 ) 2 , 0.88 g of Ca(CH 3 COO) 2 ·H 2 O, 1.50 g of Cu(CH 3 COO) 2 ·H 2 O. The Bi(NO) 3 ·5H 2 Dissolve O in 30 mL of 99.5% acetic acid, heat with magnetic stirring until all solids are dissolved to form a first solution, and heat with magnetic stirring at 40°C. The Sr(NO 3 ) 2 , Ca(CH 3 COO) 2 ·H 2 O, Cu(CH 3 COO) 2 ·H 2 O was dissolved in 30 mL of 28% ammonia water, and stirred to completely dissolve the solid matter to form a second solution. Pour the second solution into the first solution and stir evenly to form a third solution. T...

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Abstract

The invention relates to a method for preparing a bismuth-based high-temperature superconducting material. The method includes the following steps: providing a base band and a bismuth-based superconducting solution, and coating the bismuth-based superconducting solution on the base band, thereby forming a precursor film on the base tape; heat-treating the base tape formed with the precursor film to pyrolyze the precursor film, thereby forming a pyrolytic film on the base tape; on the surface of the pyrolytic film forming a barrier layer to form a precursor structure; sealing the precursor structure; heat-treating the sealed precursor structure to obtain the bismuth-based high-temperature superconducting material.

Description

technical field [0001] The invention relates to a preparation process of a superconducting material, in particular to a preparation method of a bismuth-based high-temperature superconducting material. Background technique [0002] The existing bismuth-based high-temperature superconducting materials are generally prepared by using a powder in tube method (Power in tube, PIT for short). In the specific operation of this method, silver or silver alloy is generally used as the matrix of the superconducting wire, and the superconducting powder is inserted into the silver casing or the silver alloy casing for multiple drawing, rolling and heat treatment to prepare a superconducting strip. . Since the particle size of the original superconducting powder is generally on the order of microns, there are still large gaps after the superconducting powder is inserted into the silver tube and contacts each other, resulting in limited superconducting phase density that can be increased b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L39/24H10N60/01
Inventor 邓舒同瞿体明林冠韩征和
Owner TSINGHUA UNIV