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Preparation method of high-carrying current Bi-2223 multi-core superconduction strip

A bi-2223, superconducting tape technology, applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve the problems of high technical content and large difference in current-carrying performance. The effect of simplifying the tube loading process, improving connectivity and texture, and increasing the number of core wires

Inactive Publication Date: 2018-09-28
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 present, the most effective way to improve the internal grain connectivity of Bi2223 strip is high-pressure heat treatment, and high-pressure heat treatment equipment is very expensive and has high technical content.
Manufacturers represented by Japan’s Sumitomo all use high-pressure heat treatment to improve grain connectivity, thereby improving the current-carrying performance of the strip. However, my country’s Bi2223 strip is trapped in this, and its current-carrying performance is quite different from that of Sumitomo.

Method used

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  • Preparation method of high-carrying current Bi-2223 multi-core superconduction strip
  • Preparation method of high-carrying current Bi-2223 multi-core superconduction strip
  • Preparation method of high-carrying current Bi-2223 multi-core superconduction strip

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Embodiment 1

[0032] This embodiment includes the following steps:

[0033] Step 1. The Bi-2223 powder prepared by the improved co-precipitation method is sintered at a high temperature to obtain Bi-2223 tube-packing precursor powder 1; the high-temperature sintering temperature is 820°C and the time is 28h;

[0034] Step 2. In a glove box filled with high-purity oxygen atmosphere, use a vibrating table to vibrate the tube under the condition of a vibration frequency of 40 Hz, and load the Bi-2223 tube precursor powder 1 obtained in step 1 into the silver casing 2 In the gap, a first tube-filled composite body is obtained; the mass purity of the high-purity oxygen is 99.99%; the pressure in the glove box is higher than the atmospheric pressure of 400 Pa; the silver sleeve 2 is a silver tube whose center lines overlap Stacked, such as figure 1 As shown, the diameter of the outer layer of silver tube is 21mm and the wall thickness is 1mm, the diameter of the middle layer of silver tube is 14mm, an...

Embodiment 2

[0044] This embodiment includes the following steps:

[0045] Step 1. The Bi-2223 powder prepared by the improved co-precipitation method is sintered at a high temperature to obtain Bi-2223 tube-packing precursor powder 1. The high-temperature sintering temperature is 823°C and the time is 32h;

[0046] Step 2. In a glove box filled with high-purity oxygen atmosphere, use a vibrating table to vibrate the tube under the condition of a vibration frequency of 40 Hz, and load the Bi-2223 tube precursor powder 1 obtained in step 1 into the silver casing 2 In the gap, the first tube-filled composite body is obtained; the mass purity of the high-purity oxygen is 99.995%; the pressure in the glove box is higher than the atmospheric pressure of 400 Pa; the silver sleeve 2 is composed of three silver tubes whose center lines overlap Stacked, such as figure 1 As shown, the diameter of the outer silver tube is 31mm and the wall thickness is 1.5mm, the diameter of the middle silver tube is 21mm...

Embodiment 3

[0056] This embodiment includes the following steps:

[0057] Step 1. The Bi-2223 powder prepared by the improved co-precipitation method is sintered at a high temperature to obtain Bi-2223 tube-packing precursor powder 1. The high-temperature sintering temperature is 824°C and the time is 30h;

[0058] Step 2. In a glove box filled with high-purity oxygen atmosphere, use a vibrating table to vibrate the tube under the condition of a vibration frequency of 40 Hz, and load the Bi-2223 tube precursor powder 1 obtained in step 1 into the silver casing 2 In the gap, the first tube-filled composite body is obtained; the mass purity of the high-purity oxygen is 99.99%; the pressure in the glove box is 300 Pa higher than the atmospheric pressure; the silver sleeve 2 is a silver tube whose center lines overlap Stacked, such as figure 1 As shown, the diameter of the outer silver tube is 28mm and the wall thickness is 1.25mm, the diameter of the middle silver tube is 19.5mm, and the wall thi...

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Abstract

The invention discloses a preparation method of a high-carrying current Bi-2223 multi-core superconduction strip. The method comprises the steps of 1, performing high-temperature thermal treatment onBi-2223 powder to obtain tubing precursor powder; 2, loading the Bi-2212 tubing precursor powder in a gap of a silver sleeve to obtain a first tubing composite body; 3, placing the first tubing composite body after being drawn in a silver-manganese alloy tube to obtain a second tubing composite body; 4, obtaining a multi-core wire after drawing the second tubing composite body, performing plain rolling on the multi-core wire to obtain a multi-core strip; and 5, performing thermal treatment on the multi-core strip to obtain the high-carrying current Bi-2223 superconduction strip. According to the method, the silver sleeve formed by sleeving 2 or three silver tubes with coincided central lines in a lamination way is used as an encapsulation tube of the powder, and the superconduction current-carrying performance of the Bi-2212 multi-core superconduction strip is improved by expanding the area of a silver super interface in unit volume.

Description

Technical field [0001] The invention belongs to the technical field of superconducting material preparation, and specifically relates to a preparation method of a high-current-carrying Bi-2223 multi-core superconducting tape. Background technique [0002] Bi2223(Bi 2 Sr 2 Ca 2 Cu 3 O x ) High-temperature superconductor is the most important branch of high-temperature superconducting materials. Because of its easy processing and high current-carrying performance, it becomes one of the most promising high-temperature superconducting materials. At present, the preparation technology combining the powder filling method (PIT) and the melting method is the mainstream technology for preparing high-performance Bi-based high-temperature superconducting wire strips. The technology is to pack the superconducting precursor powder into a silver tube, prepare a multi-core composite body through drawing and assembly, and then process it to the designed wire strip size, and then heat treat it to...

Claims

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Application Information

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IPC IPC(8): H01B13/00H01B12/10
CPCH01B12/10H01B13/00H01B13/0006H01B13/0016Y02E40/60
Inventor 刘国庆李成山张平祥郝清滨张胜楠焦高峰徐晓燕郑会玲马小波金利华
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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