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
CN103173705BActive Publication Date: 2016-04-27INNOVA SUPERCONDUCTOR TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
INNOVA SUPERCONDUCTOR TECH
Publication Date
2016-04-27

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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.
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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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