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Preparation of rare earth barium copper oxygen superconduction bulk material under pure oxygen atmosphere

A rare earth barium copper oxide, superconducting block technology, applied in the growth of polycrystalline materials, chemical instruments and methods, crystal growth and other directions, can solve the problems of small growth interval, spontaneous nucleation, low solubility, etc. High supersaturation, the effect of increased solubility

Inactive Publication Date: 2009-08-12
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are some technical difficulties in the preparation of larger size (d>50mm) blocks in the air atmosphere: the solubility of rare earth solutes (Y, Sm, Gd) in the Ba-Cu-O solution in the air atmosphere is small, and the solubility temperature coefficient is large ( The slope of the liquidus line is large), resulting in a slow growth rate. In order to obtain a larger size bulk material, it is necessary to ensure a long enough growth time
At the same time, during the growth process, the temperature needs to drop slowly to provide the supersaturation required for growth. Since the growth range of the metastable zone of this type of material is small, a slow cooling rate must be adopted for large-sized bulk materials, otherwise the range of the metastable zone will be damaged. lead to the generation of spontaneous nucleation, which in turn limits the growth rate of the bulk

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Growth of YBCO superconducting bulk material under pure oxygen atmosphere

[0018] 1. According to Y123 + 30mol% Y211 composition;

[0019] 2. Calcined at about 850°C for 48 hours, and then ground; in order to achieve smaller and uniform distribution of Y211 particles, calcined and ground again, and the same process was repeated three times;

[0020] 3. Press the ground powder after calcination into Circular precursor sheet with a size of 2×2×1mm placed on top 3 SmBCO as the seed crystal;

[0021] 4. Put the precursor sheet pressed in step 3 on the zirconia bead substrate, and put the whole system in a sealed system;

[0022] 5. Infuse pure oxygen at a rate of 60ml / min for 4 hours, then reduce the oxygen flow rate to 1 / 3 of the original flow rate.

[0023] 6. Heat up to 900°C in 2 hours, keep warm for 2 hours; continue heating, heat up to 1050°C in 2 hours, keep warm for 2 hours;

[0024] 7. Lower the temperature to 1015°C within 15 minutes, then lower ...

Embodiment 2

[0025] Example 2: Growth of SmBCO superconducting bulk material under pure oxygen atmosphere

[0026] 1. According to the composition of Sm123+30mol% Sm211;

[0027] 2. Calcining at about 950°C for 24 hours, and then grinding; in order to make the particles of Sm211 smaller and evenly distributed, calcining and grinding again, the same process was repeated three times;

[0028] 3. Press the ground powder after calcination into A circular precursor sheet with a SmBCO superheated film placed on top as a seed crystal;

[0029] 4. Put the precursor sheet pressed in step 3 on the zirconia bead substrate, and put the whole system in a sealed system;

[0030] 5. Infuse pure oxygen at a rate of 50ml / min for 6 hours, then reduce the oxygen flow rate to 1 / 3 of the original flow rate.

[0031] 6. Heat up to 900°C in 2 hours, keep warm for 2 hours; continue heating, heat up to 1110°C in 2 hours, keep warm for 2 hours;

[0032] 7. Lower the temperature to 1085°C within 15 minutes, the...

Embodiment 3

[0033] Example 3: Growth of GdBCO superconducting bulk material under pure oxygen atmosphere

[0034] 1. According to the composition of Gd123+30mol% Gd211;

[0035] 2. Calcining at about 900°C for 36 hours, and then grinding; in order to achieve the smaller and uniform distribution of Gd211 particles, calcining and grinding again, the same process was repeated three times;

[0036] 3. Press the ground powder after calcination into Circular precursor sheet with a size of 2×2×1mm placed on top 3 SmBCO as the seed crystal;

[0037] 4. Put the precursor sheet pressed in step 3 on the zirconia bead substrate, and put the whole system in a sealed system;

[0038] 5. Infuse pure oxygen at a rate of 80ml / min for 3 hours, then reduce the oxygen flow rate to 1 / 3 of the original flow rate.

[0039] 6. Heat up to 900°C in 2 hours, keep warm for 2 hours; continue heating, heat up to 1050°C in 2 hours, keep warm for 2 hours;

[0040] 7. Lower the temperature to 1042°C within 15 minut...

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Abstract

The invention relates to a preparation method for a rare earth barium copper oxygen superconducting block material in the pure oxygen atmosphere. The preparation method comprises the following steps: increasing the solubility of RE(Y,Sm,Gd) in a Ba-Cu-O fused mass through the pure oxygen atmosphere, providing a greater degree of supersaturation through slow temperature decrease, and increasing a growth driving force so as to quicken the growth rate of a block material; and mixing raw materials according to RE123 and an appropriate amount of RE211, grinding and calcining the raw materials for multiple times, then pressing the raw materials into a precursor piece, placing a seed crystal on the top of the precursor piece, and preparing the high temperature superconducting REBCO block material by a fusion texture method. The preparation method has a simple process, improves the production efficiency of the block material, and grows the high temperature superconducting REBCO block material with high orientation and a great single-domain structure at a high speed under the conditions of no impurity and totally matched lattices.

Description

technical field [0001] The invention relates to a method for preparing a rare earth barium copper oxide superconducting bulk material under a pure oxygen atmosphere, in particular to a method for preparing a rare earth barium copper oxide superconducting bulk material by using a melting texture method under a 1 atm pure oxygen atmosphere. Realize high-speed growth of superconducting bulk materials. 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 size and higher critical current density (Jc). The magnetic levitation force of high-temperature superconducting bulk materials incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C04B35/50
Inventor 姚忻颜士斌
Owner SHANGHAI JIAO TONG UNIV
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