Method for preparing superconducting joint of Bi-2212 wire rod

A bi-2212, superconducting joint technology, applied in the direction of connection, circuit/collector parts, electrical components, etc., can solve the problems of the overall performance of the wire and strip, affecting the effect of superconducting joints, poor performance of superconducting joints, etc. , to achieve the effect of low manufacturing cost, improved connection and high current-carrying performance

Active Publication Date: 2014-06-11
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
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AI Technical Summary

Problems solved by technology

Due to the secondary heat treatment in the preparation process of this joint, the overall performance of the wire and strip is reduced, which affects the effect of the superconducting joint.
In addition, the use of mechanical polishing to expose the superconducting core wire will cause damage to the wire strip itself
For Bi-2212 wire, this phenomenon is more prominent. The number of core wires of Bi-2212 wire exceeds 400 cores and the diameter of the core wire is only 20 μm to 30 μm. The mechanical polishing process will not only cause damage to the fragile superconducting core wire, Moreover, this mechanical method is almost impossible to really expose all the core wires, resulting in poor performance of the superconducting joint

Method used

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  • Method for preparing superconducting joint of Bi-2212 wire rod

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Comparison scheme
Effect test

Embodiment 1

[0031] Step 1. Use two Bi-2212 wires with a diameter of 1.25mm, clean the ends of the Bi-2212 wires to be connected, and then polish the cleaned ends with metallographic sandpaper, and finally form an inclination at the end of the Bi-2212 wires The polished surface; the angle between the polished surface and the length direction of the Bi-2212 wire is 30 degrees;

[0032] Step 2, placing the polished surface of the Bi-2212 wire rod polished and polished in step 1 in a corrosion solution for 20 minutes; the corrosion solution is made by uniformly mixing ammonia water, hydrogen peroxide and methanol according to a volume ratio of 30:10:100; In the corrosion process, control the length direction of the Bi-2212 wire rod to be perpendicular to the liquid surface of the corrosion solution, and the polished surface of the Bi-2212 wire rod is located below the liquid surface of the corrosion solution; the ammonia water, hydrogen peroxide and methanol are chemically pure reagents;

[0...

Embodiment 2

[0037]Step 1. Use two Bi-2212 wires with a diameter of 1.5mm, clean the ends of the Bi-2212 wires to be connected, and then polish the cleaned ends with metallographic sandpaper, and finally form a slope at the end of the Bi-2212 wires The polished surface; the angle between the polished surface and the length direction of the Bi-2212 wire is 40 degrees;

[0038] Step 2, placing the polished surface of the Bi-2212 wire rod polished in step 1 in a corrosion solution for 10 minutes; the corrosion solution is made by uniformly mixing ammonia water, hydrogen peroxide and methanol according to a volume ratio of 50:20:100; In the corrosion process, control the length direction of the Bi-2212 wire rod to be perpendicular to the liquid surface of the corrosion solution, and the polished surface of the Bi-2212 wire rod is located below the liquid surface of the corrosion solution; the ammonia water, hydrogen peroxide and methanol are chemically pure reagents;

[0039] Step three, such ...

Embodiment 3

[0043] Step 1. Use two Bi-2212 wires with a diameter of 0.8mm, clean the ends of the Bi-2212 wires to be connected, then polish the cleaned ends with metallographic sandpaper, and finally form a slope at the end of the Bi-2212 wires The polished surface; the angle between the polished surface and the length direction of the Bi-2212 wire is 30 degrees;

[0044] Step 2, placing the polished surface of the Bi-2212 wire rod polished in step 1 in a corrosion solution for 10 minutes; the corrosion solution is made by uniformly mixing ammonia water, hydrogen peroxide and methanol according to a volume ratio of 20:20:100; In the corrosion process, control the length direction of the Bi-2212 wire rod to be perpendicular to the liquid surface of the corrosion solution, and the polished surface of the Bi-2212 wire rod is located below the liquid surface of the corrosion solution; the ammonia water, hydrogen peroxide and methanol are chemically pure reagents;

[0045] Step three, such as ...

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Abstract

The invention discloses a method for preparing a superconducting joint of a Bi-2212 wire rod. The method comprises the following steps: 1. cleaning a to-be-connected end of the Bi-2212 wire rod, and polishing the end; 2. corroding the polished surface of the wire rod subjected to polishing in a corrosive solution; 3. by taking a metal pipe of which one end is closed and the other end is open as a connecting piece, forming two through holes in the closed end of the metal pipe, and assembling two corroded wire rods and the metal pipe to obtained an assembly part; and 4. performing partial molten heat treatment on the assembly part to obtain the superconducting joint of the Bi-2212 wire rod. By adopting a chemical corrosion mode, a silver layer at the end of the Bi-2212 wire rod is effectively corroded, a superconducting core is exposed under the condition that a ceramic core is not damaged, a contact area between the ceramic core and the peripheral original powder is greatly enlarged, the performance of the superconducting joint is improved, and the current-carrying performance of the superconducting joint in the prepared superconducting joint of the Bi-2212 wire rod reaches 83-90 percent of the performance of the wire rod.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconducting joint preparation, and in particular relates to a preparation method of a Bi-2212 wire superconducting joint. Background technique [0002] Bi-based high-temperature superconductors (Bi 2 Sr 2 CaCu 2 o x and Bi 2 Sr 2 Ca 2 Cu 3 o x ) is the most important branch of high-temperature superconducting materials. Due to its easy processing and high current-carrying properties, it has become one of the most promising high-temperature superconducting materials. Among them, ultra-high field (> 1GHz) NMR is One of its most important fields of application. [0003] NMR systems often require closed-loop operation, and superconducting joints are one of the key links to achieve closed-loop operation. Only when the superconducting joint and the wire strip have similar current-carrying properties can the performance of the superconducting wire strip be fully utilized, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01R43/02
Inventor 郝清滨李成山张胜楠李高山熊晓梅贾佳林张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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