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A kind of preparation method of bi-2212 high temperature superconducting wire rod

A bi-2212, high-temperature superconducting technology, applied in the usage of superconducting elements, superconducting devices, cable/conductor manufacturing, etc., can solve the problems of weak grain connection, wire performance decline, wire current drop, etc. Magnetic flux pinning performance and the effect of improving high temperature superconductivity

Active Publication Date: 2020-06-26
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of process conditions, conventional element doping to improve the current performance of Bi-2212 wire under high magnetic field is often ineffective, because only a small part of the doped elements enters the Bi-2212 lattice to improve the magnetic flux pinning of the system Performance, most of the doping elements gather at the Bi-2212 grain boundary during the melting and recrystallization process, resulting in serious weak connections between grains, resulting in a sharp drop in wire current and a sharp drop in overall wire performance, so there is currently no more A good way to further improve the performance of the wire at high or ultra-high fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment includes the following steps:

[0026] Step 1. Put the Bi-2212 precursor powder into a silver tube to obtain a single-core composite, and then draw the single-core composite to make a single-core wire; the diameter of the single-core wire is 1 mm;

[0027] Step 2. Cut the single-core wire rod made in step 1 into 7 sections of equal length, then pack it into the secondary silver tube, and then prepare the secondary composite wire rod through drawing, and repeat the above-mentioned cutting, bundled tube and Drawing process to obtain Bi-2212 wire rod; the diameter of the secondary composite wire rod is 1mm; the Bi-2212 wire rod is 49 cores;

[0028] Step 3. Place the Bi-2212 wire rod obtained in Step 2 in the constant temperature zone of the heat treatment furnace, then evacuate the furnace tube, and feed an oxygen-nitrogen mixed gas with an oxygen mass content of 5% until the pressure in the heat treatment furnace is 20atm And the partial pressure of oxyg...

Embodiment 2

[0032] This embodiment includes the following steps:

[0033] Step 1. Put the Bi-2212 precursor powder into a silver tube to obtain a single-core composite, and then draw the single-core composite to make a single-core wire; the diameter of the single-core wire is 2mm;

[0034] Step 2. Cut the single-core wire rod made in step 1 into 85 sections of equal length, then pack it into the secondary silver tube, and then prepare the secondary composite wire rod through drawing, and repeat the above-mentioned cut-off, bundled tube and Drawing process to obtain Bi-2212 wire rod; the diameter of the secondary composite wire rod is 2mm; the Bi-2212 wire rod is 7225 cores;

[0035] Step 3. Place the Bi-2212 wire rod obtained in Step 2 in the constant temperature zone of the heat treatment furnace, then evacuate the furnace tube, and feed an oxygen-argon mixed gas with an oxygen mass content of 2% until the pressure in the heat treatment furnace is 50 atm And the partial pressure of oxyg...

Embodiment 3

[0039] This embodiment includes the following steps:

[0040] Step 1. Put the Bi-2212 precursor powder into a silver tube to obtain a single-core composite, and then draw the single-core composite to make a single-core wire; the diameter of the single-core wire is 2mm;

[0041] Step 2. Cut the single-core wire rod made in step 1 into 85 sections of equal length, then pack it into the secondary silver tube, and then prepare the secondary composite wire rod through drawing, and repeat the above-mentioned cut-off, bundled tube and Drawing process to obtain Bi-2212 wire rod; the diameter of the secondary composite wire rod is 1.8mm; the Bi-2212 wire rod is 7225 cores;

[0042] Step 3. Place the Bi-2212 wire rod obtained in Step 2 in the constant temperature zone of the heat treatment furnace, then evacuate the furnace tube, and feed an oxygen-nitrogen mixed gas with an oxygen mass content of 0.8% until the pressure in the heat treatment furnace is 100atm And the partial pressure ...

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Abstract

The invention discloses a preparation method of a Bi-2212 high-temperature superconducting wire. The method comprises the following steps: step one, placing Bi-2212 precursor powder into a silver tubeand carrying out drawing to obtain a single-core wire; step two, carrying out cutting, bundling and tubing, and drawing on the single-core wire to obtain a secondary composite wire and then carryingout the cutting, bundling and tubing, and drawing again to obtain a Bi-2212 wire; step three, carrying out partial melting and thermal processing on the Bi-2212 wire; and step four, carrying out low-temperature heat treatment on the Bi-2212 wire after the partial melting and thermal processing to obtain a Bi-2212 high-temperature superconducting wire. According to the invention, with the mode of carrying out the partial melting and thermal processing and then carrying out the low-temperature heat treatment, more effective magnetic flux pinning centers are formed in the Bi-2212 wire, so that the high temperature superconducting performance of the Bi-2212 wire is improved and a problem that the performance of the Bi-2212 wire is affected by the Bi-2212 grain boundary deviation due to the element doping method is solved.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconducting wire preparation, and in particular relates to a preparation method of Bi-2212 high-temperature superconducting wire. Background technique [0002] Thanks Bi 2 Sr 2 CaCu 2 o x (Bi-2212) wire high-temperature superconductor has excellent low-temperature high-magnetic field current-carrying properties, and is currently the only practical high-temperature superconducting material that can be prepared into isotropic round wires. The above characteristics make Bi-2212 high-temperature The material of choice for interpolation coils in field magnets. [0003] However, in order to realize the large-scale application of Bi-2212 high-temperature superconducting wires, the current-carrying performance of the wires must be further improved, especially in high-field or ultra-high-field environments. Generally, Bi-2212 wire with high current-carrying performance is prepared by part...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B13/00H01B12/04H01B12/02
CPCH01B12/02H01B12/04H01B13/00Y02E40/60
Inventor 郝清滨焦高峰徐晓燕李成山刘国庆郑会玲白利锋张胜楠马小波李高山熊晓梅冯建情崔利军闫果张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH