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A kind of preparation method of bi-2223 high temperature superconducting tape

A high-temperature superconducting tape, bi-2223 technology, applied in the usage of superconducting elements, superconducting devices, cable/conductor manufacturing, etc., can solve the problem of broken cores of multi-core tapes, performance degradation of Bi-2223 tapes, etc. problems, to achieve the effect of improving processing characteristics, reducing processing characteristics differences, and easy slippage

Active Publication Date: 2020-10-02
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the non-cooperative deformation caused by the different processing characteristics of metallic silver and Bi-2223 precursor powder during the drawing process is likely to cause problems such as broken cores of the multi-core strip, which reduces the performance of the Bi-2223 strip

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of the present embodiment comprises the following steps:

[0026] Step 1. Place the Bi-2223 precursor powder in the constant temperature zone of the heat treatment furnace. Under the condition of air atmosphere, first raise the temperature to 790°C at a rate of 50°C / h and keep it for 2h, and then cool down to room temperature at a rate of 80°C / h , obtaining the pretreated Bi-2223 precursor powder; the superconducting transition temperature of the pretreated Bi-2223 precursor powder is 79K;

[0027]Step 2. Fix the oil-resistant hydraulic tube with one end sealed in a metal tube with a straightness of less than 1°, and then fill the oil-resistant hydraulic tube with one end sealed with the Bi-2223 precursor powder that has been pre-treated in step 1 by using the vibration filling method The vibration frequency adopted by the vibration packing method is 40Hz, the maximum amplitude is less than 3mm, and the vibration time is 5min; the packing density ...

Embodiment 2

[0032] The preparation method of the present embodiment comprises the following steps:

[0033] Step 1. Place the Bi-2223 precursor powder in the constant temperature zone of the heat treatment furnace. Under the condition of air atmosphere, the temperature is first raised to 800°C at a rate of 100°C / h and kept for 3h, and then cooled to room temperature at a rate of 80°C / h. , obtaining the pretreated Bi-2223 precursor powder; the superconducting transition temperature of the pretreated Bi-2223 precursor powder is 78K;

[0034] Step 2. Fix the oil-resistant hydraulic tube with one end sealed in a metal tube with a straightness of less than 1°, and then fill the oil-resistant hydraulic tube with one end sealed with the Bi-2223 precursor powder that has been pre-treated in step 1 by using the vibration filling method The vibration frequency adopted by the vibration packing method is 50Hz, the maximum amplitude is less than 3mm, and the vibration time is 10min; the packing densit...

Embodiment 3

[0039] The preparation method of the present embodiment comprises the following steps:

[0040] Step 1. Place the Bi-2223 precursor powder in the constant temperature zone of the heat treatment furnace. Under the condition of air atmosphere, first raise the temperature to 795°C at a rate of 80°C / h and keep it for 2h, and then cool down to room temperature at a rate of 70°C / h , obtaining the pretreated Bi-2223 precursor powder; the superconducting transition temperature of the pretreated Bi-2223 precursor powder is 78K;

[0041] Step 2. Fix the oil-resistant hydraulic tube with one end sealed in a metal tube with a straightness of less than 1°, and then fill the oil-resistant hydraulic tube with one end sealed with the Bi-2223 precursor powder that has been pre-treated in step 1 by using the vibration filling method The vibration frequency adopted by the vibration packing method is 60Hz, the maximum amplitude is less than 3mm, and the vibration time is 8min; the packing density...

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Abstract

The invention discloses a preparation method for a Bi-2223 high-temperature superconducting strip. The method comprises the following steps: 1, performing the heating and thermal insulation pre-treatment of Bi-2223 precursor powder; 2, putting the pre-treated Bi-2223 precursor powder into a pipe; 3, pressing the Bi-2223 precursor powder to obtain a Bi-2223 rod material, putting the Bi-2223 rod material into a pipe, and performing degassing sealing to obtain a single-core composite body; 4, sequentially performing the drawing and harness gathering and drawing of the single-core composite body to obtain a multi-core Bi-2223 wire rod, and performing rolling to obtain the Bi-2223 high-temperature superconducting strip after heat treatment. The method achieves the heating and thermal insulationof the Bi-2223 precursor powder, reduces the content of Pb in the main phase (Bi, Pb) 2212, and converts the (Bi, Pb) 2212 from the tetragonal phase to the orthogonal phase, thereby improving the processing characteristics of Bi-2223 precursor powder, improving the smoothness of a silver super interface during drawing and improving the current-carrying performance of the Bi-2223 high-temperaturesuperconducting strip.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconducting tape preparation, and in particular relates to a preparation method of Bi-2223 high-temperature superconducting tape. Background technique [0002] Bi-2223 high temperature superconductor (Bi 2 Sr 2 Ca 2 Cu 3 o x ) is the most important branch of high-temperature superconducting materials. Due to its easy processing and high current-carrying performance, Bi-2223 tape has become one of the most promising high-temperature superconducting materials. [0003] At present, the powder-in-tube method (PIT) is the mainstream technology for preparing high-performance Bi-2223 high-temperature superconducting tapes. This technology is to put the superconducting precursor powder into the silver tube, prepare a multi-core composite through drawing and cluster assembly, and then process it to the designed strip size. After heat treatment, the Bi-2223 high-temperature superconducting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B13/00H01B12/02
CPCH01B12/02H01B13/00Y02E40/60
Inventor 郝清滨刘国庆焦高峰李成山徐晓燕郑会玲白利锋张胜楠马小波李高山熊晓梅冯建情崔利军张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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