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Depositing process in no-fluorine chemical solvent for preparing high temperautre superconductive Y-Ba-Cu-O coating conductor

A coating conductor, yttrium barium copper oxide technology, applied in the field of high temperature superconducting material preparation, can solve the problems of expensive macromolecular carboxylate, increase the complexity of the preparation process, reduce the quality of coated conductors, etc., and achieve the optimization of oxygen content , low price, and the effect of reducing production costs

Inactive Publication Date: 2008-09-03
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The critical current density of the coated conductor prepared by the trifluoroacetate method is the highest among the products of the current chemical method, but the presence of fluorine in the preparation process causes environmental pollution and increases the complexity of the preparation process.
However, the macromolecular carboxylate is expensive, and the organic matter content in the colloid is very high, so it is easy to form more pores, thereby reducing the quality of the coated conductor

Method used

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  • Depositing process in no-fluorine chemical solvent for preparing high temperautre superconductive Y-Ba-Cu-O coating conductor
  • Depositing process in no-fluorine chemical solvent for preparing high temperautre superconductive Y-Ba-Cu-O coating conductor
  • Depositing process in no-fluorine chemical solvent for preparing high temperautre superconductive Y-Ba-Cu-O coating conductor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The first embodiment of the present invention is:

[0031] Dissolve yttrium acetate, barium acetate, and copper acetate in a molar ratio of 1:2:3 (that is, the ratio of the number of yttrium, barium, and copper ions to 1:2:3) in chemically pure propionic acid, and stir to make The solution is uniform to form an anhydrous solution; add polyvinyl butyral (PVB) to the anhydrous solution, stir to dissolve, and form a viscous colloid. The amount of polyvinyl butyral (PVB) added accounts for 5% of the total mass of the colloid . Drop the colloid on the substrate and rotate it with a homogenizer to coat the colloid evenly on the substrate; dry the substrate coated with the colloid at 150°C; place the dried substrate in a sintering furnace to keep the furnace temperature Slowly rise from room temperature to 200°C, and rise to 290°C at a speed of 0.15°C / min, keep it for 1 hour, then rise to 4900°C at a speed of 0.3°C / min, and keep it for 1 hour; For 99.99% argon, raise the fur...

Embodiment 2

[0033] The preparation method of this example consists of the following steps in turn:

[0034]Dissolve yttrium formate, barium formate, and copper formate in acetic acid at a molar ratio equal to 1:2:3, stir to make the solution uniform, and form an anhydrous solution; add polyethylene glycol (PEG) to the anhydrous solution, stir to dissolve, A viscous colloid is formed; the addition of polyethylene glycol (PEG) accounts for 0.5% of the total mass of the colloid. Apply the colloid evenly on the substrate; dry at 100°C; place the dried substrate in a sintering furnace, and slowly increase the temperature of the furnace from room temperature to 180°C, and at a rate of 0.1°C / min to 280°C , keep it warm for 1 hour, then raise it to 480°C at a speed of 0.1°C / min, and hold it for 1 hour; feed argon gas with a purity of 99.99% into the sintering furnace, and quickly raise the furnace temperature to 730°C at a rate of 10°C / min , heat preservation for 1 hour; after the heat preservat...

Embodiment 3

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

[0037] Dissolve yttrium formate, barium acetate, and copper acetate in a molar ratio of 1:2:3 in propionic acid, stir to make the solution uniform, and form an anhydrous solution; add polyvinylpyrrolidone (PVP) to the anhydrous solution, Stir and dissolve to form a viscous colloid; the addition of polyvinylpyrrolidone (PVP) accounts for 7.5% of the total mass of the colloid. Drop the colloid on the substrate and rotate it with a coater to coat the colloid evenly on the substrate. Dry the colloid-coated substrate at 200°C; place the dried substrate in a sintering furnace, and slowly increase the temperature of the furnace from room temperature to 230°C, and at a rate of 0.2°C / min to 300°C , keep warm for 1 hour, then increase to 500°C at a speed of 0.5°C / min, and hold for 1 hour; pass argon gas with a purity of 99.99% into the sintering furnace, and quickly raise the furnace temperature to...

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Abstract

The present invention discloses depositing process in no-fluorine chemical solvent for preparing high temperature superconductive Y-Ba-Cu-O coating conductor. The process includes the following steps: dissolving yttrium formate or yttrium acetate, barium formate, barium acetate or barium propionate, and copper formate, copper acetate or copper propionate in acetic acid or propionic acid to form no-water solution; adding PVB, PEG or PVP into the solution to form filming sol; coating the sol onto the substrate, drying, sintering in a sintering furnace, and annealing in oxygen to obtain the Y-Ba-Cu-O coating conductor. The process has low cost, easy control and no environmental pollution.

Description

technical field [0001] The invention relates to the technical field of preparation of high-temperature superconducting materials, in particular to the preparation technology of yttrium barium copper oxide (YBCO) high-temperature superconducting coating conductors. Background technique [0002] Through nearly 20 years of research and development, the large-scale industrial production and application of high-temperature superconducting materials are approaching. The second generation of high-temperature superconducting tape -- yttrium barium copper oxide (molecular formula: YBa 2 Cu 3 o 7 , abbreviated as YBCO) coated conductor, in view of its excellent intrinsic electromagnetic properties, especially its excellent current-carrying capacity under high magnetic field, has broad application prospects in power systems. The superconducting motor made of high-temperature superconducting tape is small in size, high in power, low in energy consumption, and almost noiseless. The s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/45C04B35/624H01B12/00
CPCY02E40/64Y02E40/60
Inventor 李果蒲明华周华明王文涛孙瑞萍赵勇
Owner SOUTHWEST JIAOTONG UNIV
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