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Method for preparing rare earth barium copper oxide superconducting block material

A rare earth barium copper oxide, superconducting block technology, applied in the field of superconducting materials, can solve the problems of failure of the preparation process, limit the maximum temperature, contaminate the bulk material, etc., and achieves increased preparation success rate, improved success rate, and good orientation. Effect

Inactive Publication Date: 2010-06-02
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some technical difficulties in the preparation of large-scale high-performance superconducting bulk materials by the melt-texturing method (MTG): the characteristics of the melt-texturing method (MTG) require that the melting point of the seed crystal used is higher than that of the bulk material, so the seed crystal It is not the same material as the bulk material itself, and the growth mode is heteroepitaxy
As a result, the seed crystal will contaminate the bulk material, thereby affecting the overall performance of the superconducting bulk material
In addition, when preparing large-scale REBCO superconducting bulk materials, increasing the maximum temperature (Tmax) in the process can increase the success rate of REBCO superconducting bulk materials, and in order to obtain high-performance superconducting bulk materials, the The seed crystal is also limited (such as REBCO single crystal, REBCO superheated film, etc.), but a higher Tmax will melt the above seed crystal and make the entire preparation process fail
Therefore, the traditional melt texture method (MTG) limits the improvement of Tmax, and also affects the success rate of the preparation of REBCO superconducting bulk materials.
[0003] After searching the existing technology, it was found that YBCO melt~textured growth seeded by superheatingYBCO / MgO thin film, (the method of preparing single-domain YBCO superconducting bulk material by superheating YBCO film seed melt texture method) Supercond.Sci.Technol .18(2005) L31-L34, the melting point of the seed crystal in this technology is 1045°C, which limits the increase of the highest temperature, and the seed crystal will contaminate the superconducting bulk material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Growth of YBCO superconducting bulk by melt-texturing method using miniature YBCO superconducting bulk as a protective seed layer

[0020] 1. Set Y 123 and Y 211 According to the molar ratio of 100:30 component distribution;

[0021] 2. Calcined at 850°C for 48 hours, and then ground for 4 hours with a planetary ball mill; in order to achieve smaller and uniform distribution of Y211 particles, calcined and ground again, and the same process was repeated three times;

[0022] 3. Press the calcined and ground powder into a cylindrical precursor top sheet with a diameter of 5 mm and a height of 1 mm and a cylindrical precursor negative sheet with a diameter of 30 mm and a height of 12 mm, and place the micro precursor top sheet on top of the large precursor negative sheet , and place a 2*2*1mm on top of the micro-precursor top sheet 3 SmBCO as the seed crystal;

[0023] 4. Put the precursor sheet pressed in step 3 on the zirconia bead substrate, and put the whole syste...

Embodiment 2

[0027] Growth of SmBCO superconducting bulk by melt-texturing method using miniature SmBCO superconducting bulk as a protective seed layer

[0028] 1. Put Sm 123 and Sm 211 According to the molar ratio of 100:30 component distribution;

[0029] 2. Calcined at 950°C for 48 hours, and then ground for 5 hours with a planetary ball mill; in order to achieve smaller and evenly distributed Sm211 particles, calcined and ground again, and repeated the same process three times;

[0030] 3. Press the calcined and ground powder into a cylindrical precursor top sheet with a diameter of 5 mm and a height of 1 mm and a cylindrical precursor negative sheet with a diameter of 30 mm and a height of 12 mm, and place the micro precursor top sheet on top of the large precursor negative sheet , and place a SmBCO superheated film on top of the micro-precursor top sheet as a seed crystal;

[0031] 4. Put the precursor sheet pressed in step 3 on the zirconia bead substrate, and put the whole syste...

Embodiment 3

[0035] Growth of GdBCO superconducting bulk by melt-texturing method using miniature GdBCO superconducting bulk as a protective seed layer

[0036] 1. Set Gd 123 and Gd 211 According to the molar ratio of 100:30, the component distribution component distribution;

[0037] 2. Calcined at 900°C for 48 hours, and then ground for 3 hours with a planetary ball mill; in order to achieve a smaller and uniform distribution of Gd211 particles, calcined and ground again, and the same process was repeated three times;

[0038] 3. Press the calcined and ground powder into a cylindrical precursor top sheet with a diameter of 5 mm and a height of 1 mm and a cylindrical precursor negative sheet with a diameter of 30 mm and a height of 12 mm, and place the micro precursor top sheet on top of the large precursor negative sheet , and place a 2*2*1mm on top of the micro-precursor top sheet 3 SmBCO as the seed crystal;

[0039] 4. Put the precursor sheet pressed in step 3 on the zirconia bead...

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Abstract

A method for preparing rare earth barium copper oxide superconducting block material comprises the steps of executing calcining and grinding processes in turn after mixing the RE123 and RE211 in the mole ratio of 100: (20-35); pressing the ground powder into precursor bottom piece and precursor top piece respectively; putting the precursor top piece on top of the precursor bottom piece; putting seed crystal on the precursor top piece, then putting the precursor bottom piece on a zirconium oxide bead substrate; rising temperature for heating in a sealing container, and then cooling to prepare the rare earth barium copper oxide superconducting block material. The method can prepare the high temperature superconducting block material with high performance, large single domain structure and good growth orientation under the conditions that no impurity exists and crystal lattices match completely, thereby solving the key problems of the growth and application of the superconducting block material.

Description

technical field [0001] The present invention relates to a preparation method in the technical field of superconducting materials, in particular to a rare earth barium copper oxide superconducting block based on a melt texture method based on a miniature rare earth barium copper oxide superconducting block material as a seed protective layer Material preparation method. Background technique [0002] Melt texturing (MTG) is generally considered to be a promising method for the preparation of rare earth barium copper oxide (REBCO) high temperature superconducting bulk materials. These bulk materials have many potential applications, such as magnetic levitation forces, magnetic bearings, flywheel energy storage, and permanent magnets. At the application level, the requirements for bulk materials are generally larger in size and higher in critical current density (J c ). The magnetic levitation force of high-temperature superconducting bulk materials increases with the increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/45
Inventor 姚忻李天宇
Owner SHANGHAI JIAO TONG UNIV
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