Method for preparing specific mixed-orientation YBCO (Yttrium Barium Copper Oxide) high-temperature superconducting thick film

A hybrid orientation, high temperature superconducting technology, applied in chemical instruments and methods, polycrystalline material growth, crystal growth and other directions, can solve problems such as difficulties, and achieve the effects of convenient operation, simple process and high critical current density

Inactive Publication Date: 2013-09-04
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is reported in related literature that two kinds of orientation a-axis YBCO grains grow simultaneously on NGO substrate, but it is

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment provides a method for preparing a specific mixed orientation YBCO high temperature superconducting thick film, including the following steps:

[0035] 1. According to the ratio of Ba: Cu=0.6, BaCO 3 Powder and CuO powder are mixed, put into a ball mill jar, add absolute ethanol or water for wet grinding to obtain BaCO 3 and CuO mixed slurry, the wet grinding time is 3 hours.

[0036] 2. The BaCO obtained in step 1 3 The mixed slurry with CuO was heated and dried at 105°C to obtain BaCO 3 and CuO mixed powder.

[0037] 3. The BaCO obtained in step 2 3 The mixed powder with CuO was sintered in the air at 900°C for 48 hours to obtain the precursor powder of Ba-Cu-O phase.

[0038] 4. Add the Ba-Cu-O precursor powder to the Y in the crystal growth furnace 2 o 3In the crucible of the material, the Ba-Cu-O precursor powder is added to be flush with the upper edge of the crucible.

[0039] 5. Combine the Ba-Cu-O precursor powder from step 4 with Y 2 o ...

Embodiment 2

[0044] This embodiment provides a method for preparing a specific mixed orientation YBCO high temperature superconducting thick film, including the following steps:

[0045] 1. According to the ratio of Ba: Cu=0.3, BaCO 3 Powder and CuO powder are mixed, put into a ball mill jar, add absolute ethanol or water for wet grinding to obtain BaCO 3 and CuO mixed slurry, the wet grinding time is 2 hours.

[0046] 2. The BaCO obtained in step 1 3 The mixed slurry with CuO was heated and dried at 90°C to obtain BaCO 3 and CuO mixed powder.

[0047] 3. The BaCO obtained in step 2 3 The mixed powder with CuO was sintered in the air at 890°C for 40 hours to obtain the precursor powder of Ba-Cu-O phase.

[0048] 4. Add the Ba-Cu-O precursor powder to the Y in the crystal growth furnace 2 o 3 In the crucible of the material, the Ba-Cu-O precursor powder is added to be flush with the upper edge of the crucible.

[0049] 5. Combine the Ba-Cu-O precursor powder from step 4 with Y 2 o ...

Embodiment 3

[0054] This embodiment provides a method for preparing a specific mixed orientation YBCO high temperature superconducting thick film, including the following steps:

[0055] 1. According to the ratio of Ba: Cu=0.8, BaCO 3 Powder and CuO powder are mixed, put into a ball mill jar, add absolute ethanol or water for wet grinding to obtain BaCO 3 and CuO mixed slurry, the wet grinding time is 4 hours.

[0056] 2. The BaCO obtained in step 1 3 The mixed slurry with CuO was heated and dried at 120°C to obtain BaCO 3 and CuO mixed powder.

[0057] 3. The BaCO obtained in step 2 3 The mixed powder with CuO was sintered in the air at 910°C for 50 hours to obtain the precursor powder of Ba-Cu-O phase.

[0058] 4. Add the Ba-Cu-O precursor powder to the Y in the crystal growth furnace 2 o 3 In the crucible of the material, the Ba-Cu-O precursor powder is added to be flush with the upper edge of the crucible.

[0059] 5. Combine the Ba-Cu-O precursor powder from step 4 with Y 2 o...

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Abstract

The invention discloses a method for preparing a specific mixed-orientation YBCO (Yttrium Barium Copper Oxide) high-temperature superconducting thick film. The method comprises the following steps: 1) preparing Ba-Cu-O-phase precursor powder; 2) adding the Ba-Cu-O precursor powder in a Y2O3 crucible in a crystal growing furnace; heating to the first temperature for heat preservation, and obtaining a Y-Ba-Cu-O solution; 3) adding the Ba-Cu-O-phase precursor powder in the high-temperature solution, and preserving heat; 4) cooling the solution to the second temperature at a first cooling speed; and 5) inserting a seed crystal material fixed at a connecting rod into the solution obtained in the step 4) for liquid phase epitaxial growth to obtain the specific mixed-orientation YBCO high-temperature superconducting thick film. As the Ba-Cu-O powder is added again at the high-temperature period, the Y-Ba-Cu-O solution achieves a state of lower degree of supersaturation in a metastable region to grow the YBCO liquid-phase epitaxial film with consistent orientation and a mixed grain boundary structure. The process is simple, and the operation is convenient.

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 specific mixed orientation YBCO high-temperature superconducting thick film. Background technique [0002] The discovery of superconductivity stems from an experiment on the change of the electrical resistance of mercury with temperature. In the experiment, when the temperature reaches only a few K, the resistance of mercury disappears, which is the first discovered zero resistance effect. Then the Meissner effect in superconductors was discovered. Since the materials known at the time needed to be used at extremely low temperatures to exhibit superconducting properties, they did not have the possibility of large-scale industrial applications. [0003] With the discovery of high-temperature superconductors, large-scale industrial application of high-temperature superconductors has become possible, and the research on ...

Claims

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Application Information

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IPC IPC(8): C30B28/10C30B29/22
Inventor 姚忻郭林山蒋金生陈媛媛程玲彭波南王伟
Owner SHANGHAI JIAO TONG UNIV
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