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Preparation method of bi-system high-temperature superconducting material

A superconducting material and high-temperature superconducting technology, applied in the field of high-temperature superconducting wire rod preparation, can solve the problems of uneven Bi-2212 wire and strip, affecting the performance uniformity of wire and strip, and improving the current-carrying performance of difficult-to-wire strip. , to achieve the effect of improving engineering current density, reasonable design and low manufacturing cost

Inactive Publication Date: 2011-12-21
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The processing process of this Bi-2212 wire and strip has certain requirements on the silver ratio. If the silver ratio (the area ratio of silver to superconducting powder on the cross section of the superconducting wire after processing) There will be serious unevenness in the material, which will affect the uniformity of the final performance of the wire strip
At present, the silver-to-silver ratio of Bi-2212 wire is generally higher than 2.5, and the silver-to-silver ratio of the strip is generally higher than 2. Because the proportion of superconducting powder is too low, it is difficult to further improve the current-carrying performance of the wire and strip.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Prepare the Bi-2212 powder into a strip with a cross-sectional size of 4.2mm×0.2mm by using powder tube method and cluster drawing technology;

[0019] (2) Mix the organic solvent ethanol and the binder amino resin in a mass ratio of 50:1 to form a colloid, then add Bi-2212 powder 12 times the mass of the amino resin to the colloid and stir evenly to obtain a suspension;

[0020] (3) After the band material described in step (1) is wiped clean with ethanol, it is guided by pulleys and dip-coated in the liquid tank in which the suspension described in step (2) is housed, and then it is baked by a drying oven through pulley guides. Drying, the length of the drying furnace is 1 meter, the temperature is 100 ° C, and the running speed of the strip is 1 m / s; the dried strip is wound on the winding machine to obtain a bismuth-based high-temperature superconductor coated with a superconducting film. Guide strip material;

[0021] (4) The bismuth-based high-temperature sup...

Embodiment 2

[0024] The preparation method of this example is the same as that of Example 1, except that the binder is phenolic resin or polyvinyl butyral.

[0025] The silver-to-silver ratio of the bismuth-based high-temperature superconducting strip prepared in this example is reduced from 2 to 1.5 before adding the superconducting film, and the critical current performance of the strip is also increased by about 19%.

Embodiment 3

[0027] (1) Prepare the Bi-2212 powder into a strip with a cross-sectional size of 4.2mm×0.2mm by using powder tube method and cluster drawing technology;

[0028] (2) Mix the organic solvent methanol and the binder amino resin in a mass ratio of 100:1 to form a colloid, then add Bi-2212 powder 15 times the mass of the amino resin to the colloid and stir evenly to obtain a suspension;

[0029] (3) After the band material described in step (1) is wiped clean with ethanol, it is guided by pulleys and dip-coated in the liquid tank in which the suspension described in step (2) is housed, and then it is baked by a drying oven through pulley guides. Drying, the drying furnace is 1 meter long, the temperature is 700 ° C, and the running speed of the strip is 10 m / s; the dried strip is wound on the winding machine to obtain a bismuth-based high-temperature superconductor coated with a superconducting film. Guide strip material;

[0030] (4) The bismuth-based high-temperature supercond...

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PUM

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Abstract

The invention discloses a preparation method of a bi-system high-temperature superconducting material, comprising the following steps of: preparing Bi-2212 powder into a bi-system tape material by adopting a powder tubing method and a clustered drawing technology; dissolving a bonder by using methanol or ethanol as a solvent and then adding the Bi-2212 powder to mix evenly so as to obtain suspension liquid; causing the bi-system tape material to pass through a liquid trough which is loaded with the suspension liquid and then guiding the bi-system tape material to pass through a drying furnaceso as to obtain a bi-system high temperature superconducting tape material which is externally coated with a superconducting film; and carrying out semi-melting treatment on the bi-system high temperature superconducting tape material which is externally coated with the superconducting film and then obtaining the bi-system high-temperature superconducting tape material after cooling with a furnace. The preparation process of the invention is simple, reasonable in design, low in manufacturing cost and large in popularization. In the invention, a layer of Bi-2212 superconducting film is added on the surface of the bi-system tape material prepared by a PIT method so that the silver hypergeometric of the tape material is decreased, the effective superconducting area is increased and the engineering current density of the bi-system tape material is improved.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconducting wire preparation, and in particular relates to a preparation method of a bismuth-based high-temperature superconducting material. Background technique [0002] Because Bi-2212 high-temperature superconductor has excellent high-magnetic field current-carrying performance in the 4.2K~20K temperature range, and is the only high-temperature superconducting material that can be prepared into isotropic round wires, it is a good choice for the preparation of interpolation coils for high-field magnet systems. material of choice. [0003] At present, the preparation technology combining the powder-in-tube method (PIT) and the melting method is the mainstream technology for preparing high-performance Bi-2212 wire and strip. The technology is to put Bi-2212 powder into a silver tube, prepare a multi-core composite body by swaging, drawing, and assembling, and then process it to the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B13/00H01B12/02
CPCY02E40/641Y02E40/60
Inventor 李成山郝清滨张胜楠宋璐璐李高山熊晓梅贾佳林
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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