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Method for preparing lanthanum-zirconium oxide La2Zr2O7 buffer layer thin film of high-temperature superconducting coating conductor on biaxially textured NiW alloy substrate

A technology of coated conductors and high-temperature superconductors, which is applied in the manufacture/processing of superconductor devices, can solve the problems of high prices and restrictions on the development of practical strips, and achieve reduced production costs, smooth coatings, and simple production processes Effect

Inactive Publication Date: 2012-06-20
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the high price of metal alkoxide or acetylacetonate, this will limit the development of practical tape

Method used

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  • Method for preparing lanthanum-zirconium oxide La2Zr2O7 buffer layer thin film of high-temperature superconducting coating conductor on biaxially textured NiW alloy substrate
  • Method for preparing lanthanum-zirconium oxide La2Zr2O7 buffer layer thin film of high-temperature superconducting coating conductor on biaxially textured NiW alloy substrate
  • Method for preparing lanthanum-zirconium oxide La2Zr2O7 buffer layer thin film of high-temperature superconducting coating conductor on biaxially textured NiW alloy substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The first specific embodiment of the present invention is a method for preparing a high-temperature superconducting coating conductor La on a biaxially textured NiW alloy substrate. 2 Zr 2 o 7 The method for buffer layer thin film, its step is:

[0029] a, preparation of anhydrous solution: equal to the ratio of 1:1 by the ion number ratio of lanthanum and zirconium, get lanthanum nitrate (La(NO 3 ) 3 .6H 2 O) and zirconium nitrate (Zr(NO 3 ) 4 .5H 2 O), be dissolved in ethylene glycol methyl ether, form anhydrous solution;

[0030] b. Colloid preparation: Add polyethylene glycol-20000 to the anhydrous solution of step a to form a colloid;

[0031] c. Colloid coating and drying: coating the colloid prepared in step b on the biaxially textured NiW alloy substrate;

[0032] d, thermal decomposition treatment: the substrate coated with colloid is placed in a sintering furnace, and 2 5% H by volume 2 -In an Ar mixed gas atmosphere, raise the furnace temperature f...

Embodiment 2

[0039] The preparation method of this example consists of the following steps in turn:

[0040] a, preparation of anhydrous solution: equal to the ratio of 1:1 by the ion number ratio of lanthanum and zirconium, get lanthanum nitrate (La(NO 3 ) 3 .6H 2 O) and zirconium nitrate (Zr(NO 3 ) 4 .5H 2 O), be dissolved in ethylene glycol methyl ether, form anhydrous solution;

[0041] b. Colloid preparation: Add polyethylene glycol-20000 to the anhydrous solution of step a to form a colloid;

[0042] c. Colloid coating and drying: coating the colloid prepared in step b on the biaxially textured NiW alloy substrate;

[0043] d, thermal decomposition treatment: the substrate coated with colloid is placed in a sintering furnace, and 2 5% H by volume 2 -In an Ar mixed gas atmosphere, raise the furnace temperature from room temperature to 400°C at a rate of 0.7°C / min, then to 670°C at a rate of 1.2°C / min and keep it warm for 0.5 hours, then let the furnace cool down to room temper...

Embodiment 3

[0050] The preparation method of this example consists of the following steps in turn:

[0051] a, preparation of anhydrous solution: equal to the ratio of 1:1 by the ion number ratio of lanthanum and zirconium, get lanthanum nitrate (La(NO 3 ) 3 .6H 2 O) and zirconium nitrate (Zr(NO 3 ) 4 .5H 2 O), be dissolved in ethylene glycol methyl ether, form anhydrous solution;

[0052] b. Colloid preparation: Add polyethylene glycol-20000 to the anhydrous solution of step a to form a colloid;

[0053] c. Colloid coating and drying: coating the colloid prepared in step b on the biaxially textured NiW alloy substrate;

[0054] d, thermal decomposition treatment: the substrate coated with colloid is placed in a sintering furnace, and 2 5% H by volume 2 -In an Ar mixed gas atmosphere, the furnace temperature was raised from room temperature to 420°C at a rate of 0.7°C / min, and then raised to 700°C at a rate of 1.4°C / min for 0.5 hours, and then the furnace was allowed to cool down ...

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Abstract

The invention discloses a method for preparing a lanthanum-zirconium oxide La2Zr2O7 buffer layer thin film of a high-temperature superconducting coating conductor on a biaxially textured NiW alloy substrate. The method comprises the following steps of: dissolving lanthanum nitrate La(NO3)3.6H2O and zirconium nitrate Zr(NO3)4.5H2O in ethylene glycol monomethyl ether to form an anhydrous solution; adding polyethylene glycol 20000 (PEG-20000) into the anhydrous solution to prepare colloid with a high film-forming property; and coating the colloid on the biaxially textured NiW alloy substrate, and placing the biaxially textured NiW alloy substrate in a sintering furnace for sintering and phase formation to obtain the La2Zr2O7 buffer layer thin film of the high-temperature superconducting coating conductor. The method is low in manufacture cost; the La2Zr2O7 thin film with high quality can be easily prepared; and a buffer layer of the coating conductor can effectively function.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconducting material preparation, and in particular relates to the preparation technology of a high-temperature superconducting coating conductor buffer layer film. Background technique [0002] The second high temperature superconducting material R E Ba 2 Cu 3 o 7-x (abbreviated as R E BCO,R E Yttrium or lanthanides), due to its excellent intrinsic electromagnetic properties, its application prospects will be broader than the first generation of high-temperature superconducting materials. It has become a research hotspot all over the world. But R E Due to its own layered structure, BCO leads to extremely strong anisotropy, and the load current capacity on the ab plane of the lattice is much higher than that in the c-axis direction. R E The current-carrying performance of BCO high-temperature superconducting materials is extremely sensitive to the lattice mismatch in the a an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L39/24H10N60/01
Inventor 张欣程翠华赵勇张勇张敏王文涛雷鸣
Owner SOUTHWEST JIAOTONG UNIV
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