Method for preparing high-temperature superconducting coating conductor LaSrMnO3 buffering layer film

A technology of coated conductors and high-temperature superconductors, which is applied in the manufacture/processing of superconductor devices, and can solve problems such as quenching of superconducting layers

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

AI Technical Summary

Problems solved by technology

In the practical superconducting thin film, when the superconducting current has weak grain connections, defects or cracks in the local superconducting layer, the local current may exceed the superconducting critical current Ic value, thereby causing the superconducting layer to quench

Method used

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  • Method for preparing high-temperature superconducting coating conductor LaSrMnO3 buffering layer film
  • Method for preparing high-temperature superconducting coating conductor LaSrMnO3 buffering layer film
  • Method for preparing high-temperature superconducting coating conductor LaSrMnO3 buffering layer film

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The first specific embodiment of the present invention is a method for preparing a high-temperature superconducting coated conductor La 0.7 Sr 0.3 MnO 3 The method for buffer layer thin film, its step is:

[0028] a, preparation of anhydrous solution: analytically pure lanthanum oxide (La 2 o 3 ) is dissolved in acetic acid according to the ratio of cation ratio La:Sr:Mn=0.7:0.3:1 (the molar ratio of acetic acid to cation is 10:1). After the solution is completely dissolved, the solution is placed in an infrared drying oven, and taken out after the solution is dried into a white solid (ie, lanthanum acetate). Strontium acetate and manganese acetate are mixed and dissolved in propionic acid with the prepared white solid according to the ratio of the above-mentioned cation ratio La:Sr:Mn=0.7:0.3:1 to form an anhydrous solution;

[0029] b. Colloid preparation: Add polyvinyl butyral (PVB) to the anhydrous solution in step a for ultrasonic dissolution to form a viscous...

Embodiment 2

[0036] The preparation method of this example consists of the following steps in turn:

[0037] a, preparation of anhydrous solution: analytically pure lanthanum oxide (La 2 o 3 ) is dissolved in acetic acid according to the ratio of cation ratio La:Sr:Mn=0.7:0.3:1 (the molar ratio of acetic acid to cation is 10:1). After the solution is completely dissolved, the solution is placed in an infrared drying oven, and taken out after the solution is dried into a white solid (ie, lanthanum acetate). Strontium acetate and manganese acetate are mixed and dissolved in propionic acid with the prepared white solid according to the ratio of the above-mentioned cation ratio La:Sr:Mn=0.7:0.3:1 to form an anhydrous solution;

[0038] b. Colloid preparation: Add polyvinyl butyral (PVB) to the anhydrous solution in step a for ultrasonic dissolution to form a viscous colloid. The addition of polyvinyl butyral (PVB) accounts for 3% of the total mass of the colloid

[0039] c. Colloid coating...

Embodiment 3

[0045] The preparation method of this example consists of the following steps in turn:

[0046] a, preparation of anhydrous solution: analytically pure lanthanum oxide (La 2 o 3 ) is dissolved in acetic acid according to the ratio of cation ratio La:Sr:Mn=0.7:0.3:1 (the molar ratio of acetic acid to cation is 10:1). After the solution is completely dissolved, the solution is placed in an infrared drying oven, and taken out after the solution is dried into a white solid (ie, lanthanum acetate). Strontium acetate and manganese acetate are mixed and dissolved in propionic acid with the prepared white solid according to the ratio of the above-mentioned cation ratio La:Sr:Mn=0.7:0.3:1 to form an anhydrous solution;

[0047] b. Colloid preparation: Add polyvinyl butyral (PVB) to the anhydrous solution in step a for ultrasonic dissolution to form a viscous colloid. The addition of polyvinyl butyral (PVB) accounts for 2% of the total mass of the colloid

[0048] c. Colloid coating...

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Abstract

The invention discloses a method for preparing a high-temperature superconducting coating conductor La0.7Sr0.3MnO3 buffering layer film, and belongs to the technical field of high-temperature superconducting materials preparation. The film prepared by the method is smooth and compact, and is favorable in texture, and triplex functions of La0.7Sr0.3MnO3 as a conducting buffering layer film, namely isolation, extension and electric current transmission, can be adequately exerted. The method comprises the following steps: dissolving analytically pure lanthanum oxide (La2O3) in acetic acid (the mol ratio of the acetic acid to cations being 10: 1) in a cation ratio of La: Sr: Mn=0.7: 0.3: 1; after the analytically pure lanthanum oxide is completely dissolved, putting the obtained solution in an infrared drying box, and after the solution is baked into a white solid, taking out the white solid; mixing and dissolving strontium acetate and manganese acetate with the prepared white solid (namely lanthanum acetate) in propionic acid in the cation ratio of La: Sr: Mn=0.7: 0.3: 1 to form an anhydrous solution; adding polyvinyl butyral (PVB) in the anhydrous solution to prepare into a colloid with good film forming property; and coating the colloid on a substrate, drying the coated substrate, and then, putting the dried substrate in a sintering furnace to be sintered to form a phase, so as to obtain a lanthanum-strontium-manganese oxide La0.7Sr0.3MnO3 high-temperature superconducting coating conductor buffering layer. The cost of the method is low; the manufacturing process is simple; the operation is easy to control; and the environment is not polluted.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-temperature superconducting materials, in particular to a high-temperature superconducting coating conductor La 0.7 Sr 0.3 MnO 3 Fabrication technology of buffer layer film. Background technique [0002] The second-generation high-temperature superconducting tape, that is, the rare earth barium copper oxide ReBCO coated conductor, has broad application prospects in power systems due to its excellent intrinsic electromagnetic properties, especially its excellent current-carrying capacity under high magnetic field. Developed countries have vigorously promoted the research and practical application of second-generation high-temperature superconductors based on their own technological innovation and long-term interests in electric energy, and international competition has become increasingly fierce. [0003] The ReBCO-coated conductor based on Ni alloy has a typical sandwich structure, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L39/24
Inventor 张欣赵勇程翠华张勇王文涛雷鸣
Owner SOUTHWEST JIAOTONG UNIV
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