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Method for improving critical current density of Bi-2223 strip material

A bi-2223, critical current technology, applied in the usage of superconductor elements, circuits, electrical components, etc., can solve problems such as no substantial progress, and achieve the effect of improving performance

Inactive Publication Date: 2006-12-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, from the perspective of practical feasibility, so far, there has been no substantial progress in the research on the introduction of ferromagnetic material coating on the surface of high-temperature superconducting strips.

Method used

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  • Method for improving critical current density of Bi-2223 strip material
  • Method for improving critical current density of Bi-2223 strip material
  • Method for improving critical current density of Bi-2223 strip material

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Embodiment

[0017] 1. First carefully polish off the insulating varnish on the selected area (edge ​​part) of the strip with finer sandpaper, and clean the surface of the strip; select a DC stabilized power supply as the electroplating power supply, and the output voltage of the power supply is 3V. Strip current 30mA. The thickness of the coating on the surface of the composite wire is changed by changing the electroplating time. The electroplating time is chosen as 30~180 minutes, obtains the Bi-2223 strip material of electroplating ferromagnetic material on the surface, as figure 1 As shown in the figure, the surface of the superconducting layer 3 is covered with a silver layer 2, and the outer surface of the silver layer 2 is a ferromagnetic coating 1. Wherein the electroplating solution for electroplating ferromagnetic material is 50wt% NiSO by volume 4 : 50wt% NiCl 2 : 3g / 100ml of HBO 3 = 1:1:1 dubbed.

[0018] 2. In the electroplating process, we have selected different coating...

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Abstract

The disclosed method to improve critical current for a Bi-2223 belt material comprises: polishing the insulating varnish on selected area of the material with fine sand paper, cleaning, and using a dc constant power as electroplating source to output 3V voltage and alter plating time for different coating thickness. This invention can control ac loss fit to large-scale production.

Description

technical field [0001] The invention belongs to the field of high-temperature superconducting materials, in particular to a method for increasing the critical current of Bi-2223 strips. Specifically, the critical current is increased by electroplating ferromagnetic materials on the surface of the Bi-2223 strip, and the AC loss is effectively controlled at the same time. It can be practically applied to the large-scale production of Bi-based high-temperature superconducting strips. Background technique [0002] Existing methods to increase the critical current density of Bi-2223 multi-core strips include optimizing the concentration of cations, improving the sintering process, improving the machining deformation technology, and coating ferromagnets outside the superconducting wire core. However, these methods often lead to unfavorable phenomena such as sausage effect in the wire core, contamination of the superconducting phase, decreased volume ratio of the superconducting p...

Claims

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Application Information

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IPC IPC(8): H01B12/00H01B13/00C25D7/00C25D5/00C25D3/12
CPCY02E40/64Y02E40/60
Inventor 阿木韩征和顾晨
Owner TSINGHUA UNIV
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