Method for polymer-assistant depositing high temperature superconducting coating conductor superconducting layer

A polymer-assisted, high-temperature superconducting technology, which is applied in the manufacture/processing of superconductor devices, can solve the problems of expensive equipment, reduced superconductivity of thin films, porous holes and microcracks, etc., and achieves reduced manufacturing costs and low prices , good stability

Inactive Publication Date: 2008-09-24
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: the required equipment is expensive, and it is difficult to realize the large-scale commercial application of coated conductors
However, there are the following deficiencies in the existing preparation methods: in the metal-organic deposition method, polymer materials with a content of more than 20% are added, and the mass loss of the polymer compound during the decomposition and film formation process will lead to the formation of superconducting film surface A large number of holes and microcracks, which reduce the current-carrying performance of the superconducting layer
The surface of the film prepared by this phase formation process is relatively large and there are relatively many holes and microcracks. Such a surface microstructure also reduces the superconductivity of the film.

Method used

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  • Method for polymer-assistant depositing high temperature superconducting coating conductor superconducting layer
  • Method for polymer-assistant depositing high temperature superconducting coating conductor superconducting layer
  • Method for polymer-assistant depositing high temperature superconducting coating conductor superconducting layer

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specific Embodiment approach

[0034] A kind of specific embodiment of the present invention is:

[0035] A method for polymer-assisted deposition of a high-temperature superconducting coating conductor superconducting layer, the specific method of which is:

[0036] a. Preparation of precursor solution: dissolving yttrium acetate, barium acetate, and copper acetate in propionic acid according to the stoichiometric ratio of rare earth: barium: copper in a ratio of 1:2:3 to obtain a precursor solution.

[0037] b. Preparation of coating colloid: In the precursor solution, add 3 parts of polyvinyl butyral (PVB) macromolecular additives and stir well to obtain a uniform and transparent coating colloid with a certain viscosity.

[0038]c. Colloid coating and drying: Spin coating is used for coating, that is, the colloid is dropped on the substrate and rotated with a coater to obtain a uniform coating film, and then dried at 100°C for 20 minutes.

[0039] d. Decomposition heat treatment: In a dry argon atmosphe...

Embodiment 2

[0043] This example is basically the same as Example 1, the difference is:

[0044] In the preparation of the precursor solution in step a, the rare earth acetate is dysprosium acetate.

[0045] In the d-step decomposition heat treatment process, the temperature is raised from room temperature to 135°C at a rate of 3°C / min in a dry argon atmosphere, and then water vapor with a dew point of 20°C is introduced into the furnace, and argon gas is introduced at the same time to form moist argon At this time, the temperature was raised to 450°C at a rate of 1°C / min, and the temperature was kept for 0.75 hours.

[0046] In the phase-forming heat treatment of step e, water vapor with a dew point of 30°C and argon gas are introduced into the tube furnace in the upward step to form a humid argon protective atmosphere, and the furnace temperature is rapidly raised at 25°C / min To 840°C, keep warm for 5 minutes; then cool down to 775°C at 7°C / min, keep warm for 1 hour, and finally drop to...

Embodiment 3

[0049] This example is basically the same as Example 1, the difference is:

[0050] In the preparation of the precursor solution in step a, the rare earth acetate is gadolinium acetate.

[0051] In the preparation of the coating colloid in step b, 5 parts of polyethylene glycol (PEG) was added to the precursor solution as a polymer material additive.

[0052] The drying in step c is 150° C. for 15 minutes.

[0053] In the d-step decomposition heat treatment process, the temperature is raised from room temperature to 125°C at a rate of 2°C / min in a dry argon atmosphere, and then water vapor with a dew point of 15°C is introduced into the furnace, and argon gas is introduced at the same time to form moist argon At this time, the temperature was raised to 470°C at a rate of 0.25°C / min, and kept for 1 hour.

[0054] During the phase-forming heat treatment in step e, water vapor with a dew point of 35°C and argon gas are passed into the tube furnace in step d to form a humid argo...

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Abstract

A macromolecule-assisted method of deposition for a superconducting layer of a high-temperature superconductivity coating electrical conductor has the preparation method as follows: a. dissolving rare-earth acetate, barium acetate and cupric acetate in monoprop with a stoichiometric proportion that rare-earth: barium: cupric equals to 1:2:3 to acquire a precursor solution; b. adding PVB, PEG or PVP into the precursor solution with the weight ratio of 2-8:100 to acquire a coating colloid; c. coating the coating colloid on a substrate and heating for drying; d. placing the substrate in a tubular furnace to carry out decomposition heat treatment; e. rapidly heating up the furnace temperature to 800-900 DEG C under moist argon atmosphere for 5-15min, then lowering the temperature to 750-780 DEG C for 1-3 hours, and then lowering the temperature to 350-500 DEG C under the argon atmosphere for low temperature oxygen-permeation annealing treatment, and the superconducting layer is acquired by cooling. The method has the advantages of low cost and simple technique, which is applied to industrialized production; the superconducting layer prepared is characterized by high biaxial texture, flat and dense surface and good superconductivity.

Description

technical field [0001] The invention relates to a method for preparing a high-temperature superconducting material, in particular to a method for preparing a superconducting layer of a high-temperature superconducting coated conductor. Background technique [0002] In 1986, the discovery of a new high-temperature superconducting material, yttrium barium copper oxide (YBCO), brought the superconducting transition temperature T c From the original 30K to above 90K, a major breakthrough has been made in the application of superconducting materials above the liquid nitrogen temperature. This important discovery opens up a new era not only in the theory of solid-state physics, but also in the potential application of high-temperature superconducting materials. However, due to the weak connection problem of the grain boundary of the YBCO bulk material itself, it directly affects the increase of the superconducting critical current density under the magnetic field, thus limiting t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L39/24C04B35/45
Inventor 王文涛赵勇蒲明华木丽云
Owner SOUTHWEST JIAOTONG UNIV
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