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A method for optimizing the oxygen content in the bi-2223 phase of superconducting tape and the resulting superconducting wire

A bi-2223, superconducting tape technology, applied in superconducting/high-conducting conductors, usage of superconducting elements, superconducting devices, etc., to achieve the effects of increasing content, increasing critical current, and improving magnetic field performance

Active Publication Date: 2016-04-27
INNOVA SUPERCONDUCTOR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned prior art puts too much emphasis on increasing Tc, ignoring the loss of too much oxygen due to increasing Tc, thereby causing the reduction of oxygen content in the Bi-2223 phase, and the moderate oxygen content in the Bi-2223 phase is to improve the superconducting properties of the strip. The basics

Method used

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  • A method for optimizing the oxygen content in the bi-2223 phase of superconducting tape and the resulting superconducting wire
  • A method for optimizing the oxygen content in the bi-2223 phase of superconducting tape and the resulting superconducting wire
  • A method for optimizing the oxygen content in the bi-2223 phase of superconducting tape and the resulting superconducting wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Heat treatment process: one heat treatment (HT1), the oxygen partial pressure is 0.5%, the temperature is 400°C, and the holding time is 500h.

[0044] After the above heat treatment process, the critical transition temperature (Tc) of the superconducting tape is 110K, and the critical current (Ic) is 127A.

Embodiment 2

[0046] Heat treatment process: primary heat treatment (HT1), the oxygen partial pressure is 10%, the temperature is 455°C, and the holding time is 10h; the temperature is raised to 620°C, and the holding time is continued for 120h, and the oxygen partial pressure remains unchanged.

[0047] After the above heat treatment process, the critical transition temperature (Tc) of the superconducting tape is 113K, and the critical current (Ic) is 120A.

Embodiment 3

[0049] Heat treatment process: one heat treatment (HT1), the temperature is 845°C, the oxygen partial pressure is 20%, and the holding time is 250h; the oxygen partial pressure is reduced to 17.5%, and the holding time is continued for 20h, and the temperature remains unchanged.

[0050] After the above heat treatment process, the critical transition temperature (Tc) of the superconducting tape is 111.5K, and the critical current (Ic) is 135A.

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Abstract

The invention relates to a method for optimizing oxygen content in Bi-2223 phase of a superconductive tape and a superconductive lead prepared by the same. The method comprises the following steps of: pressing precursor powder into a powder rod and filling the powder rod into a pure silver tube to form a short blank; drawing the short blank to a single-core lead, cutting the single-core lead into a plurality of segments, filling the segments into a silver alloy tube, and again drawing the tube to obtain a multi-core lead; rolling the multi-core lead to obtain a raw tape; subjecting the raw tape to conventional heat treatment during which superconducting transition happens with intermediate deformation happening too; and after the conventional heat treatment is finished, again carrying out at least once heat treatment. The heat treatment is a primary heat treatment, a secondary heat treatment or a tertiary heat treatment; the ranges of partial pressure of oxygen are all 0.5-20%; Tc is improved to 118K, and Ic is improved to 160A. By virtue of the innovation provided by the invention, the oxygen content in the Bi-2223 phase reaches the optimal valve so that Tc and Ic are improved, simultaneously the existence of a second phase is reduced to the greatest extent, the content of the Bi-2223 phase is improved, crystal boundary is purified, arrangement and connection of the Bi-2223 crystal grains are promoted, and magnetic field performance is improved.

Description

technical field [0001] The invention relates to a Bi-based high-temperature superconducting wire, in particular to a method for optimizing the oxygen content in the Bi-2223 phase of a superconducting tape, and a superconducting wire prepared by the method. Background technique [0002] With the increasing application of high-temperature superconducting technology, the market demand for high-temperature superconducting wires is also increasing. At present, the Bi-based high-temperature superconducting wire is the only high-temperature superconducting wire that can be mass-produced. The processing technology is formed, and finally heat treatment is carried out, which is referred to as the powder casing method. [0003] 1. Pretreatment of precursor powder: the pretreatment of precursor powder includes the synthesis and roasting of precursor powder, the raw materials of metal oxide (or inorganic acid salt, organic acid salt) are dosed according to a certain nominal composition ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/16H01B12/00
CPCY02E40/60
Inventor 宋秀华孙海波
Owner INNOVA SUPERCONDUCTOR TECH
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