Method for preparing superconducting film through bismuth-based superconducting material

A technology of superconducting materials and superconducting thin films, which is applied in the field of preparing superconducting thin films using bismuth-based superconducting materials, can solve the problems of high cost, difficulty in preparing superconducting thick films, and unfavorable practical application, and achieve less impurity, impurity Easy to remove and good uniformity

Inactive Publication Date: 2016-08-10
CHENGDU JUNHE TIANCHENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are not only costly, but also difficult to prepare large-area

Method used

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Embodiment 1

[0055] A method for preparing a superconducting thin film using a bismuth-based superconducting material, comprising the following process steps:

[0056] 1) Preparation process of bismuth-based superconducting powder suspension;

[0057] 2) Put the substrate on the tray of the homogenizer, start the vacuum pump to make the substrate adsorb on the tray;

[0058] 3) Spin-coat the bismuth-based superconducting powder suspension prepared in step 1) on a homogenizer to form a high-temperature superconducting thick film:

[0059] 3-1) Coat the prepared bismuth-based superconducting powder suspension onto the substrate, start the homogenizer, and start spin-coating the high-temperature superconducting thick film;

[0060] 3-2) Put the high-temperature superconducting thick film obtained in step 3-1) on a constant temperature heating plate, heat it in an air environment at 63.4°C~78.6°C for 5~10min, and then put it in a high-temperature furnace at 510°C- Heating at 530°C for 3 to 5...

Embodiment 2

[0068] This embodiment is further optimized on the basis of the above-mentioned embodiments. In order to better realize the present invention, the following setting method is adopted in particular: in the step 3), the number of layers of the coating film is 5-8 layers, and The coating process of each layer is the same.

Embodiment 3

[0070] This embodiment is further optimized on the basis of any of the above embodiments. In order to better realize the present invention, the following setting method is adopted in particular: the step 1), the preparation process of bismuth-based superconducting powder suspension includes The following process steps:

[0071] 1-1) The superconducting precursor solution is spray-dried;

[0072] 1-2) The superconducting powder after the spray-drying process is subjected to a low-temperature sintering process above 500°C, the sintering time is ≥35min, and dry air is introduced into the sintering process as a protective atmosphere, and the powder layer thickness during sintering is ≤ 1.35cm;

[0073] 1-3) After step 1-2), the first mechanical pulverization step is performed on the powder after low-temperature sintering, and the particle size of the superconducting powder is controlled at the particle size unit D50≤4.5μm;

[0074] 1-4) After steps 1-3), the powder obtained afte...

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Abstract

The invention discloses a method for preparing a superconducting film through bismuth-based superconducting material. The method comprises the following process steps that the technology of preparing bismuth-based superconducting powder suspension liquid is performed; a substrate is arranged on a spin coater tray, and a vacuum pump is started so that the substrate is enabled to be adsorbed on the tray; the bismuth-based superconducting powder suspension liquid is spin-coated on a spin coater so that a high temperature superconducting thick film is formed; after completion of film coating, the thermal decomposition process is started, and the thermal decomposition steps are listed as follows: the high temperature superconducting thick film of the required number of layers is heated, heating temperature rises to 480 DEG C from 60 DEG C, and heating time is 50min; heat is preserved for 5h at temperature of 480 DEG C; and the high temperature superconducting thick film of the required number of layer is cooled to normal temperature from temperature of 480 DEG C so that the superconducting film is obtained. The defects in the prior art that cost is high and practicability is not facilitated in preparing the bismuth-based superconducting film can be solved, the bismuth-based superconducting thick film preparation method which is simple and convenient in technology, low in cost and high in benefic is designed, and the large-area bismuth-based superconducting film can be prepared by adopting the method.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a method for preparing a superconducting thin film using a bismuth-based superconducting material. Background technique [0002] A superconducting material refers to a material that exhibits the properties of zero resistance and repelling magnetic lines of force under certain low temperature conditions. It has been found that 28 kinds of elements and thousands of alloys and compounds can become superconductors. [0003] Superconducting materials have the following properties: [0004] zero resistance [0005] In the superconducting state, superconducting materials have zero electrical resistance and can transmit electrical energy without loss. If a magnetic field is used to induce a current in the superconducting loop, this current can be maintained without decay. This "persistent current" has been observed experimentally many times. [0006] Diamagnetic [0007] When...

Claims

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Application Information

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IPC IPC(8): H01B12/06
CPCH01B12/06Y02E40/60
Inventor 李会玲
Owner CHENGDU JUNHE TIANCHENG TECH
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