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Method for preparing Bi-2223-Ag multi-core superconductive strip material by adding nano-copper

A technology of bi-2223 and superconducting strips, applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc. Expensive equipment and other issues, to achieve the effect of improving the uniformity of current carrying, avoiding pollution, and avoiding the influence of core wire density

Active Publication Date: 2016-08-17
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if choosing a reasonable heat treatment system can greatly reduce the C content in the powder, but in the later tube loading process, if the control is not proper due to the high activity of the powder, it is easy to absorb H in the air. 2 O and CO 2 gas, causing eventual bubbling to occur
The use of high-pressure heat treatment can largely suppress the occurrence of bubbling, and at the same time increase the density of the core wire, so that high current-carrying performance can be obtained, but suitable high-voltage equipment is very expensive. Currently, only Sumitomo Corporation of Japan has such equipment, and it is in the For reasons of technical secrecy, the export of equipment is prohibited
However, due to various reasons in China, the high-pressure heat treatment equipment manufactured in China has not significantly improved the current-carrying performance of the strip. Therefore, it is very necessary to avoid the occurrence of bubbling and improve the uniformity of the strip performance through reasonable technological improvements.

Method used

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  • Method for preparing Bi-2223-Ag multi-core superconductive strip material by adding nano-copper
  • Method for preparing Bi-2223-Ag multi-core superconductive strip material by adding nano-copper

Examples

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Embodiment 1

[0026] The preparation method of the Bi-2223 / Ag multi-core superconducting tape of this embodiment includes the following steps:

[0027] Step 1. Use conventional co-precipitation method to prepare Bi-2223 precursor powder with low copper content. After sintering the precursor powder, add nano-copper powder to the sintered precursor powder so that the mass content of copper in the precursor powder reaches the theoretical mass content. Under the protection of argon, the precursor powder added with nano-copper powder is ball-milled and uniformly mixed to obtain a tube-filled precursor powder; the copper underweight Bi-2223 precursor powder means that the quality of copper in the precursor powder is the theoretical mass of copper in Bi-2223 The mass purity of the nano copper powder is not less than 99.9%, the particle size is not more than 50nm; the volume purity of the argon gas is not less than 99.99%, the ball-to-battery ratio in the ball milling process is 2:1, and the ball milli...

Embodiment 2

[0037] The preparation method of the Bi-2223 / Ag multi-core superconducting tape of this embodiment includes the following steps:

[0038] Step 1. Use conventional co-precipitation method to prepare Bi-2223 precursor powder with low copper content. After sintering the precursor powder, add nano-copper powder to the sintered precursor powder so that the mass content of copper in the precursor powder reaches the theoretical mass content. Under the protection of argon, the precursor powder added with nano-copper powder is ball-milled and uniformly mixed to obtain a tube-filled precursor powder; the copper underweight Bi-2223 precursor powder means that the quality of copper in the precursor powder is the theoretical mass of copper in Bi-2223 The mass purity of the nano copper powder is not less than 99.9%, the particle size is not more than 50nm; the volume purity of the argon gas is not less than 99.99%, the ball-to-battery ratio in the ball milling process is 5:1, and the ball milli...

Embodiment 3

[0045] The preparation method of the Bi-2223 / Ag multi-core superconducting tape of this embodiment includes the following steps:

[0046] Step 1. Use conventional spray pyrolysis method to prepare Bi-2223 precursor powder with insufficient copper content. After sintering the precursor powder, add nano-copper powder to the sintered precursor powder so that the mass content of copper in the precursor powder reaches the theoretical mass content. Then, under the protection of argon gas, the precursor powder added with nano-copper powder is ball-milled and mixed uniformly to obtain a tube-filled precursor powder; the copper under-quantity Bi-2223 precursor powder means that the quality of copper in the precursor powder is the copper theory in Bi-2223 94% of the mass; the mass purity of the nano copper powder is not less than 99.9%, the particle size is not more than 50nm; the volume purity of the argon gas is not less than 99.99%, the ball-to-battery ratio in the ball milling process i...

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Abstract

The invention discloses a method for preparing a Bi-2223-Ag multi-core superconductive strip material by adding nano-copper. The method comprises the steps that 1, copper-short Bi-2223 precursor powder is prepared, sintered and subjected to ball milling by adding nano-copper powder, the materials are mixed to be uniform, and then tubing precursor powder is obtained; 2, a tubing compound is prepared in a tubing mode; 3, the tubing compound is processed into a single-core wire material in a drawing mode; 4, the single-core wire material is sequentially sized, cut, strengthened and washed, and then a multi-core wire material is prepared by adopting a bundle drawing method; 5, the multi-core wire material is rolled into the multi-core strip material, and heat treatment is conducted to obtain the Bi-2223-Ag multi-core superconductive strip material. According to the method, part of copper in the Bi-2223 precursor powder is replaced with an appropriate amount of the nano-copper powder, oxygen adsorbed by the powder is absorbed by the nano-copper powder to generate copper oxide in final heat treatment, and therefore influences of an impurity phase on the strip material properties are avoided; in addition, the bubbling phenomenon can be prevented as far as possible on the premise that the current carrying property of the strip material can be guaranteed, and the uniformity of the strip material properties is improved.

Description

Technical field [0001] The invention belongs to the technical field of superconducting wire strip preparation, and specifically relates to a method for preparing a Bi-2223 / Ag multi-core superconducting strip by adding nano copper. Background technique [0002] Bi-2223(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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B12/02
CPCH01B12/02H01B13/00Y02E40/60
Inventor 李成山刘国庆郝清滨白利锋郑会玲焦高峰徐晓燕马小波张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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