Preparing method of large diameter yttrium barium copper oxide superconducting single domain blocks

A yttrium-barium-copper-oxide, large-diameter technology, which is applied in the field of preparation of large-diameter yttrium-barium-copper-oxide superconducting single-domain bulk materials, can solve complex preparation processes, high requirements for seed crystal orientation and positioning consistency, and non-seed crystal spontaneous generation. Nucleation and other problems, to achieve the effect of simplifying the preparation process and avoiding the problem of seed crystal orientation and positioning

Inactive Publication Date: 2010-06-09
SHANGHAI UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Due to the small seed crystal area of ​​the traditional single-seed crystal technology, when growing large-size (diameter above 50mm) bulk materials, it is often unavoidable that non-seed crystal spontaneous nucleation occurs, making the growth of large-scale high-temperature superconducting bulk materials a must An insurmountable technical problem
There are also a series of technical problems in the growth of large-sized single-domain bulk materials by using multi-seed technology, such as: superconducting weak connection regions inevitably appear between domain boundaries; the orientation and positioning consistency between seeds is very high, and the preparation The process is complicated, which is not conducive to the batch preparation of single-domain bulk materials
[0003] In the past, when large-size superconducting bulk materials were grown with a small-size top seed crystal melt texture, the main problem was that the small-size seed crystal made the phase transformation driving force at the growth front obviously insufficient, which resulted in a large degree of crystal growth rate. Inhibition, the negative effects brought about by the long growth cycle, such as the grain ripening phenomenon, will further inhibit the fabric growth conditions of the crystal

Method used

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  • Preparing method of large diameter yttrium barium copper oxide superconducting single domain blocks
  • Preparing method of large diameter yttrium barium copper oxide superconducting single domain blocks
  • Preparing method of large diameter yttrium barium copper oxide superconducting single domain blocks

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Effect test

Embodiment 1

[0028] (1) Take 320 grams of precursor mixed powder (Y123+30%molY211+0.5%wt CeO2), put it into a mold with a diameter of 65mm, and perform uniaxial compression molding with a compression molding pressure of 20MPa. Pressed into a diameter of 65mm, a preform body (2) with a thickness of about 23mm.

[0029] (2) Take 35 grams of mixed powder for the transition layer gasket, and uniaxially press-mold it into a transition layer gasket (3) with a diameter of 60 mm and a thickness of 4 mm.

[0030] (3) Set the size to 14×14×3mm 3 The SmBCO seed crystal (1) is placed on the upper surface of the yttrium barium copper oxide preform body, the body is placed on the transition layer gasket, and the MgO single wafer (4) and Al 2 o 3 Ceramic plates (5). The overall structure of the sintered body before entering the furnace is shown in the attached figure 1 .

[0031] (4) After the green body is put into the furnace, the temperature is raised to 1047°C, and the temperature is rapidly low...

Embodiment 2

[0035] (1) Take 420 grams of precursor mixed powder (Y123+30%molY211+0.5%wt CeO2), put it into a mold with a diameter of 85mm, and perform uniaxial compression molding with a compression molding pressure of 30MPa. Pressed into a diameter of 85mm, a preform body (2) with a thickness of about 18mm.

[0036] (2) Take 50 grams of mixed powder for the transition layer gasket, and uniaxially press mold it into a transition layer gasket (3) with a diameter of 80 mm and a thickness of 3 mm.

[0037] (3) Set the size to 15×15×3mm 3 The SmBCO seed crystal (1) is placed on the upper surface of the yttrium barium copper oxide preform body, the body is placed on the transition layer gasket, and the MgO single wafer (4) and Al 2 o 3 Ceramic plates (5). The overall structure of the sintered body before entering the furnace is shown in the attached figure 1 .

[0038](4) After the green body is put into the furnace, the temperature is raised to 1050°C, and the temperature is rapidly cool...

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Abstract

The invention relates to a preparing method of large diameter yttrium barium copper oxide superconducting single domain blocks, which belongs to the preparing technical field of superconducting ceramic. The invention provides a method for growing large-size and high-temperature superconducting single domain blocks through improved top-seeded melt texture. The method adopts large-size samarium barium copper oxide (Sm-Ba-Cu-O) seed crystal and an yttrium barium copper oxide (Y-Ba-Cu-O) preforming green body which is prepared according to defined chemical mixtures, the former is laid on the top of the latter, and melt texture growth method is performed in a high-temperature condition. The method overcomes the problem that spontaneous nucleation is easy to occur during the process of melt texture growth of small-size seed crystal, and effectively realizes the growth of large-size high-temperature yttrium barium copper oxide superconducting single domain blocks through a top-seeded melt texture method.

Description

technical field [0001] The invention relates to a method for preparing a large-diameter yttrium-barium-copper-oxygen superconducting monodomain bulk material, which belongs to the technical field of superconducting ceramic material preparation. Background technique [0002] At present, two kinds of seed crystal insertion technologies are usually used to grow high-temperature superconducting bulk materials by using the top seed melt texture method; one is the traditional single-seed crystal technology, and the other is the multi-seed crystal technology. Due to the small seed crystal area of ​​the traditional single-seed crystal technology, when growing large-size (diameter above 50mm) bulk materials, it is often unavoidable that non-seed crystal spontaneous nucleation occurs, making the growth of large-scale high-temperature superconducting bulk materials a must An insurmountable technical problem. There are also a series of technical problems in the growth of large-sized si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/45
Inventor 徐克西吴兴达左鹏翔
Owner SHANGHAI UNIV
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