Preparation method of Bi-2212 high-temperature superconductive thick film

A bi-2212, high-temperature superconducting technology, applied in the manufacture/processing of superconductor devices, etc., can solve the problems of restricting the performance of superconducting thick films, small effective distance of baseband-induced texture, and low texture degree of superconducting layer, etc. Achieve the effect of increasing the effective current-carrying area, increasing the density of the superconducting layer, and improving the engineering current density

Inactive Publication Date: 2012-06-20
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the thick film prepared by the traditional dip coating method, due to the relatively loose bonding between the powders, pores are relatively easy to form during the texture formation process of partial melting heat treatment, and the effective distance of the baseband-induced texture is small, eventually resulting in a superconducting layer. The texture degree is low, which seriously restricts the improvement of the properties of Bi-2212-based superconducting thick films

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step 1. Dissolve the binder polyethylene glycol in absolute ethanol, then add Bi-2212 powder with a particle size of 400-500 mesh to obtain a suspension, and keep stirring to keep the composition of the suspension uniform; the absolute ethanol , The mass ratio of polyethylene glycol and Bi-2212 powder is 0.4:0.001:1;

[0020] Step 2, immerse the wiped silver-based tape in the suspension described in step 1, and then pull the silver-based tape at a pulling speed of 0.5m / s, so that the surface of the silver-based tape is coated with the suspension, and finally the surface is coated with The silver-based tape with the suspension is dried at a temperature of 700°C;

[0021] Step 3, using a cold press to cold-press the silver-based tape after drying in step 2 for 10 min under a pressure of 15 MPa;

[0022] Step 4. Sintering the cold-pressed silver-based tape in step 3 in a pure oxygen atmosphere to obtain a Bi-2212 high-temperature superconducting thick film with a thicknes...

Embodiment 2

[0025] Step 1. Dissolve the binder polyethylene glycol in anhydrous methanol, then add Bi-2212 powder with a particle size of 400-500 mesh to obtain a suspension, and keep stirring to keep the composition of the suspension uniform; the anhydrous ethanol , The mass ratio of polyethylene glycol and Bi-2212 powder is 1:0.002:1;

[0026] Step 2, immerse the cleaned silver-based tape in the suspension described in step 1, then pull the silver-based tape at a pulling speed of 2m / s, so that the surface of the silver-based tape is coated with the suspension, and finally the surface is coated with The silver-based band of the suspension is dried at a temperature of 500°C;

[0027] Step 3, using a cold press to cold-press the silver-based tape after drying in step 2 for 10 min under a pressure of 20 MPa;

[0028] Step 4. Sintering the cold-pressed silver-based tape in step 3 in a pure oxygen atmosphere to obtain a Bi-2212 high-temperature superconducting thick film with a thickness of ...

Embodiment 3

[0031] Step 1. Dissolve the binder polyvinyl butyral in anhydrous methanol, then add Bi-2212 powder with a particle size of 400-500 mesh to obtain a suspension, and keep stirring to keep the composition of the suspension uniform; the anhydrous The mass ratio of ethanol, polyethylene glycol and Bi-2212 powder is 0.6:0.002:1;

[0032] Step 2, immerse the cleaned silver-manganese alloy baseband in the suspension described in step 1, then pull the silver-manganese alloy baseband at a pulling speed of 1m / s, so that the surface of the silver-manganese alloy baseband is coated with the suspension, Finally, drying the silver-manganese alloy base strip coated with the suspension at a temperature of 100°C;

[0033] Step 3, using a cold press to cold press the silver-manganese alloy base tape after drying in step 2 for 20 minutes under a pressure of 18 MPa;

[0034] Step 4, sintering the cold-pressed silver-manganese alloy baseband in step 3 in a pure oxygen atmosphere to obtain a Bi-22...

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Abstract

The invention discloses a preparation method of a Bi-2212 high-temperature superconductive thick film, which includes the following steps: firstly, dissolving binder into organic solvent and then adding Bi-2212 powder to obtain turbid liquid; secondly, coating the turbid liquid on a scrubbed metal base band through a dip-coating method, and then drying the base band; thirdly, cold pressing the metal base band which is dried through a cold press under the pressure of 15MPa-20MPa for 10-20min; and fourthly, sintering the cold-pressed metal base band in pure oxygen to obtain a Bi-2212 superconductive thick film with the thickness of 10-80 micrometers. The cold press is adopted to cold press the Bi-2212 thick film prepared through the dip-coating method, the density of the Bi-2212 superconductive layer of the film is increased under the premise of not damaging the superconductive layer, thereby the effective current carrying area of the superconductive layer is increased and the engineering current density of the Bi-2212 thick film is increased.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconducting materials, and in particular relates to a preparation method of a Bi-2212 high-temperature superconducting thick film. Background technique [0002] Since Bi-2212-based high-temperature superconducting materials have excellent high-magnetic field current-carrying properties in the temperature range of 4.2K to 20K, and are currently the only high-temperature superconducting materials that can be prepared into isotropic round wires, these characteristics make Bi-2212 Wire has become the material of choice for the preparation of interpolation coils for high-field magnet systems. At the same time, based on the excellent high-field diamagnetic properties of Bi-2212 high-temperature superconducting materials, Bi-2212 superconducting thick films are widely used in magnetic shielding and other fields; and circuits can also be made on the surface of thick films by etching and other...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L39/24
Inventor 李成山张胜楠郝清滨白利峰宋露露
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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