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Method for characterizing creep deformation resistance of Bi2212 high-temperature superconducting wires

A bi2212, high-temperature superconducting technology, applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve problems such as the difference in porosity of wire rods, and achieve low cost, strong practicability, and accurate results sex high effect

Active Publication Date: 2020-12-15
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 the porosity of the wire prepared by the same powder or processing parameters also has certain differences

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment includes the following steps:

[0029] Step 1. Take two Bi2212 high-temperature superconducting wires with the same powder, processing parameters, length and diameter but different batches, and mark them as wire A and wire B respectively, and then polish the cross-sections of wire A and wire B respectively , statistically analyze and calculate the cross-sectional area percentage of the core wire in the cross-section of wire A and wire B, correspondingly marked as A% and B%, wherein A%=22.94%, B%=25.36%;

[0030] Step 2. Put wire rod A and wire rod B in step 1 into a heat treatment furnace for high-pressure heat treatment with the same process parameters, and take it out after cooling to room temperature; the process of high-pressure heat treatment is: 2 In a mixed atmosphere, first raise the temperature from 25°C to 820°C at a rate of 160°C / h for 2 hours, then raise the temperature to 888°C at a rate of 50°C / h and hold for 12 minutes, then cool down to 8...

Embodiment 2

[0037] This embodiment includes the following steps:

[0038] Step 1. Take two Bi2212 high-temperature superconducting wires with different powder compositions but the same processing parameters, length and diameter, and mark them as wire A and wire B respectively, where the powder composition used in wire A is Bi 2.17 Sr 1.94 Ca 0.89 Cu 2.0 o x , the powder composition used in wire B is Bi 2.10 Sr 1.90 Ca 0.86 Cu 2.0 o x , then respectively polish the cross-sections of wire A and wire B, statistically analyze and calculate the cross-sectional area percentage of the core wire in the cross-sections of wire A and wire B, correspondingly marked as A% and B%, wherein A%=28.40%, B% = 27.22%;

[0039] Step 2. Put wire rod A and wire rod B in step 1 into a heat treatment furnace for high-pressure heat treatment with the same process parameters, and take it out after cooling to room temperature; the process of high-pressure heat treatment is: 2 In a mixed atmosphere, first r...

Embodiment 3

[0046] This embodiment includes the following steps:

[0047] Step 1. Take two Bi2212 high-temperature superconducting wires that use powder, have the same length and diameter but have different processing parameters, and mark them as wire A and wire B respectively. When the processing size of the silver tube in the three-time cluster assembly drawing is from 8mm In the process of reducing to 4mm, the processing rate of wire A is 20%, and the processing rate of wire B is 10%. The percentage of the cross-sectional area of ​​the core wire is marked as A% and B%, where A%=27.40%, B%=28.12%;

[0048] Step 2. Put wire rod A and wire rod B in step 1 into a heat treatment furnace for high-pressure heat treatment with the same process parameters, and take it out after cooling to room temperature; the process of high-pressure heat treatment is: 2 In a mixed atmosphere, first raise the temperature from 25°C to 820°C at a rate of 160°C / h for 2 hours, then raise the temperature to 888°C ...

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Abstract

The invention discloses a method for characterizing creep deformation resistance of Bi2212 high-temperature superconducting wires, which comprises the following steps of: detecting the diameter increase rate of different Bi2212 high-temperature superconducting wires before and after normal-pressure heat treatment by adopting a method of high-pressure heat treatment and normal-pressure heat treatment, and comparing and analyzing to obtain the creep deformation resistance of different Bi2212 high-temperature superconducting wires. According to the method, the creep stress in the wire is multiplied through a high-pressure process, and then normal-pressure heat treatment is performed to enable the Bi2212 high-temperature superconducting wire to generate obvious creep, so that the diameter increase rate of different Bi2212 high-temperature superconducting wires before and after the normal-pressure heat treatment is conveniently detected and obtained, and the creep deformation resistance ofdifferent Bi2212 high-temperature superconducting wires is obtained; the method is convenient and rapid, high in result accuracy, low in cost and high in practicability, and provides powerful data support for evaluating the creep deformation resistance of the Bi2212 high-temperature superconducting wire.

Description

technical field [0001] The invention belongs to the field of performance testing and characterization of high-temperature superconducting wires, and in particular relates to a method for characterizing the ability of Bi2212 high-temperature superconducting wires to resist creep deformation. Background technique [0002] The good macroscopic current-carrying performance and mechanical properties of Bi2212 high temperature superconducting wire are the key to its engineering application. The macroscopic current-carrying performance of the wire is closely related to the porosity in the wire: the larger the pore size and the number of pores, the worse the current-carrying performance. In addition, the ability of wire rods to resist creep deformation is an important indicator for evaluating the mechanical properties of wire rods, and it has important reference significance for evaluating the ability of wire rods to resist fracture or even leakage caused by creep deformation. [0...

Claims

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Application Information

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IPC IPC(8): H01B12/04
CPCH01B12/04Y02E40/60
Inventor 李珍宝徐晓燕金利华刘国庆郑会玲焦高峰郝清滨刘学谦李成山
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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