Method for remarkably improving critical current density of Bi2212 superconducting material

A critical current density, bi2212 technology, applied in the field of high temperature superconducting material preparation, can solve the problems of uncontrollable AEC phase content, unrealized, undirected control, etc., to achieve strong controllability and operability, low cost, promotion The effect of grain growth

Active Publication Date: 2022-02-18
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It has been found that a small amount of 14:24 AEC phase ((Sr, Ca) 14 Cu 24 o x ) helps to promote the growth of Bi2212 grains, thereby improving the current-carrying performance of Bi2212 superconducting materials, but there are many types of second phases spontaneously formed in Bi2212, and it is currently impossible to control the generation of 14:24 AEC phases, and it is impossible to control AEC Phase content
At present, researchers are focusing their efforts on studying the essential mechanism of the spontaneous formation of the 14:24 AEC phase in Bi2212, and the directional control of the 14:24 AEC phase in Bi2212 superconducting materials has not yet been achieved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment includes the following steps:

[0024] Step 1. The AEC phase of 14:24 is artificially prepared by co-precipitation process; the mass ratio of Sr, Ca, and Cu in the AEC phase of 14:24 has an error range of less than 3% compared with the design mass ratio; the co-precipitation process The specific process is: preparation of oxalic acid ethanol solution, and then SrCO 3 , CaCO 3 and Cu are dissolved in nitric acid to obtain a nitrate mixed solution, wherein the atomic ratio of (Sr+Ca) to Cu is 14:24, and the atomic ratio of Sr to Ca is 0.45:0.55, and the mixed solution of nitrate and ammonia water are added simultaneously The co-precipitated powder was obtained from the oxalic acid ethanol solution, and after the co-precipitated powder was cracked and ground step by step, the AEC phase of 14:24 was obtained;

[0025] Step 2. Add the 14:24 AEC phase obtained in step 1 to the Bi2212 powder and stir and mix evenly to obtain a mixed powder; the added mass of ...

Embodiment 2

[0031] This embodiment includes the following steps:

[0032]Step 1, artificially prepare and obtain the AEC phase of 14:24 by spray pyrolysis process; the mass ratio of Sr, Ca, and Cu in the AEC phase of 14:24 is less than 3% in the error range of the design mass ratio; the spray thermal The specific process of the solution process is: the SrCO 3 , CaCO 3 and Cu are dissolved in nitric acid to obtain a mixed solution of nitrate, wherein the atomic ratio of (Sr+Ca) to Cu is 14:24, and the atomic ratio of Sr to Ca is 0.45:0.55, and then the mixed solution of nitrate is sprayed Pyrolysis to obtain pyrolysis powder, after pyrolysis powder is cracked and ground step by step, the AEC phase of 14:24 is obtained;

[0033] Step 2. Add the 14:24 AEC phase obtained in step 1 to the Bi2212 powder and stir and mix evenly to obtain a mixed powder; the added mass of the 14:24 AEC phase is 3% of the mass of the Bi2212 powder;

[0034] Step 3, prepare slurry with the mixed powder obtained ...

Embodiment 3

[0039] This embodiment includes the following steps:

[0040] Step 1, artificially prepare and obtain the AEC phase of 14:24 by spray pyrolysis process; the mass ratio of Sr, Ca, and Cu in the AEC phase of 14:24 is less than 3% in the error range of the design mass ratio; the spray thermal The specific process of the solution process is: the SrCO 3 , CaCO 3 and Cu are dissolved in nitric acid to obtain a mixed solution of nitrate, wherein the atomic ratio of (Sr+Ca) to Cu is 14:24, and the atomic ratio of Sr to Ca is 0.45:0.55, and then the mixed solution of nitrate is sprayed Pyrolysis to obtain pyrolysis powder, after pyrolysis powder is cracked and ground step by step, the AEC phase of 14:24 is obtained;

[0041] Step 2. Add the 14:24 AEC phase obtained in Step 1 to the Bi2212 powder and stir and mix evenly to obtain a mixed powder; the added mass of the 14:24 AEC phase is 5% of the mass of the Bi2212 powder;

[0042] Step 3, prepare slurry with the mixed powder obtained...

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PUM

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Abstract

The invention discloses a method for remarkably improving the critical current density of a Bi2212 superconducting material. The method comprises the following steps: artificially preparing to obtain a 14: 24 AEC phase, then adding the AEC phase into Bi2212 powder, uniformly mixing to obtain mixed powder, and preparing the Bi2212 superconducting material from the mixed powder. According to the invention, the artificially prepared 14: 24 AEC phase is added into the Bi2212 powder to prepare the Bi2212 superconducting material, and the addition amount of the 14: 24 AEC phase in the Bi2212 powder is effectively controlled, so that the content of the AEC phase is directionally and quantitatively controlled in the Bi2212 powder, the growth of Bi2212 crystal grains is promoted, the critical current density of the Bi2212 superconducting material is remarkably improved, the current-carrying performance of the Bi2212 superconducting material is improved, the operation is simple, the cost is low, controllability and operability are high, and rapid application in the Bi2212 superconducting material is facilitated.

Description

technical field [0001] The invention belongs to the field of preparation of high-temperature superconducting materials, and in particular relates to a method for significantly increasing the critical current density of Bi2212 superconducting materials. Background technique [0002] Although the use of key technologies such as the high-pressure heat treatment wire method reported internationally and the preparation of Bi2212 powder based on the spray chemical combustion method have significantly improved the critical current density of the Bi2212 superconducting material, the silver matrix used in the Bi2212 superconducting material makes it cost-effective. Still high. Only by further increasing the critical current density of Bi2212 superconducting materials can the cost-effectiveness of Bi2212 superconducting materials be further reduced, and ultimately its application in large-scale high-field magnets in the future can be strongly promoted. [0003] It has been found that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B12/00C04B35/453C04B35/626
CPCH01B12/00C04B35/453C04B35/62605C04B2235/3298C04B2235/3213C04B2235/3208C04B2235/3281Y02E40/60
Inventor 李珍宝刘国庆姚凯
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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