Preparation method of Bi-2212 multi-core superconducting wire

A bi-2212, superconducting wire technology, applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve the problems of high technical content, complicated operation, expensive high-pressure heat treatment equipment, etc. Improve the preparation efficiency, increase the contact area, and avoid the effect of performance degradation

Inactive Publication Date: 2018-09-28
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high-pressure heat treatment equipment is very expensive, and the technical content is high, and the operation is complicated

Method used

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  • Preparation method of Bi-2212 multi-core superconducting wire
  • Preparation method of Bi-2212 multi-core superconducting wire
  • Preparation method of Bi-2212 multi-core superconducting wire

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Experimental program
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Embodiment 1

[0034] This embodiment includes the following steps:

[0035] Step 1. The Bi-2212 powder prepared by the improved co-precipitation method was subjected to high-temperature sintering three times to obtain Bi-2212 tube-packed precursor powder 1; the temperature of the high-temperature sintering was 850°C for 20 hours;

[0036] Step 2, use a vibrating table in a glove box in a vacuum state to vibrate the tube under the condition that the vibration frequency is 40 Hz, and put the Bi-2212 tube-loading precursor powder 1 obtained in step 1 into the gap of the silver sleeve 2 to obtain The first tube-loading complex; the vacuum in the glove box is not more than 100Pa; the silver sleeve 2 is formed by stacking silver tubes whose centerlines overlap, such as figure 1 Shown, wherein the diameter of outer layer silver tube is 21mm, and wall thickness is 1mm, and the diameter of middle layer silver tube is 14mm, and wall thickness is 1mm, and the diameter of inner layer silver tube is 7mm...

Embodiment 2

[0046] Step 1. The Bi-2212 powder prepared by the improved co-precipitation method was subjected to high-temperature sintering three times to obtain Bi-2212 tube-packed precursor powder 1; the temperature of the high-temperature sintering was 840°C for 18 hours;

[0047] Step 2, use a vibrating table in a glove box in a vacuum state to vibrate the tube under the condition that the vibration frequency is 40 Hz, and put the Bi-2212 tube-loading precursor powder 1 obtained in step 1 into the gap of the silver sleeve 2 to obtain The first tube-loading complex; the vacuum in the glove box is not more than 100Pa; the silver sleeve 2 is formed by stacking silver tubes whose centerlines overlap, such as figure 1 Shown, wherein the diameter of outer layer silver tube is 28mm, and wall thickness is 1.5mm, and the diameter of middle layer silver tube is 19mm, and wall thickness is 1.2mm, and the diameter of inner layer silver tube is 10mm, and wall thickness is 1.2mm; The position of eac...

Embodiment 3

[0057] Step 1. The Bi-2212 powder prepared by the improved co-precipitation method is subjected to high-temperature sintering twice to obtain Bi-2212 tube-packed precursor powder 1; the temperature of the high-temperature sintering is 850° C., and the time is 18 hours;

[0058] Step 2, use a vibrating table in a glove box in a vacuum state to vibrate the tube under the condition that the vibration frequency is 40 Hz, and put the Bi-2212 tube-loading precursor powder 1 obtained in step 1 into the gap of the silver sleeve 2 to obtain The first tube-loading complex; the vacuum in the glove box is not more than 100Pa; the silver sleeve 2 is formed by stacking silver tubes whose centerlines overlap, such as figure 1 Shown, wherein the diameter of outer layer silver tube is 25mm, and wall thickness is 1.2mm, and the diameter of middle layer silver tube is 17mm, and wall thickness is 1.1mm, and the diameter of inner layer silver tube is 8.5mm, and wall thickness is 1.1mm; Fix the pos...

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Abstract

The invention discloses a preparation method of a Bi-2212 multi-core superconducting wire, which comprises the following steps: firstly, sintering Bi-2212 powder at a high temperature to obtain a tubulated precursor powder; secondly, loading the tubulated precursor powder into a silver casing to obtain a first tubulated composite body; thirdly, drawing the first tubulated composite body and assembling into a silver tube to obtain a second tubulated composite body; fourthly, drawing the second tube-tube composite body and assembling to a silver-manganese alloy tube with a silver bar to obtain athird tubulated composite body; fifthly, drawing the third tubulated composite body and performing semi-melting treatment to obtain a Bi-2212 multi-core superconducting wire. According to the preparation method of the Bi-2212 multi-core superconducting wire in the invention, the silver casing formed by lamination sleeving 2-3 silver tubes whose central lines are overlapped is used as the casing of the powder, thereby increasing the contact area between the silver and the Bi-2212 tubulated precursor powder, forming more silver super interface, obviously improving the connection between the internal crystal grains of the Bi-2212 multi-core superconducting wire after heat treatment, and improving the current carrying capacity of the Bi2212 wire.

Description

technical field [0001] The invention belongs to the technical field of superconducting material preparation, and in particular relates to a preparation method of Bi-2212 multi-core superconducting wire. Background technique [0002] Bi 2 Sr 2 CaCu 2 o x (abbreviated as Bi2212) high temperature superconductor is an important branch of high temperature superconducting materials, because it is easy to process into isotropic circular wire, and has high current carrying capacity and high upper critical field, making Bi2212 high temperature superconducting wire It has broad application prospects. [0003] Powder-in-tube method (PIT) is the mainstream technology for preparing Bi2212 wire, and the wire prepared by this technology has reached the practical level. However, the current carrying capacity of the Bi2212 wire is limited, which greatly limits the application of the wire. Studies have shown that most of the current in the superconducting state of Bi2212 wire flows alon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B12/10B21C37/04
CPCB21C37/047H01B12/10H01B13/00Y02E40/60
Inventor 刘国庆李成山张平祥郝清滨焦高峰徐晓燕郑会玲张胜楠马小波金利华
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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