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Method for preparing yttrium barium copper oxygen superconducting block material by taking Ba3Cu5*Ox powder as fluid

A technology of yttrium barium copper oxide and superconducting block, which is applied in the direction of polycrystalline material growth, chemical instruments and methods, self-solid, etc., can solve the problem of high-temperature superconducting bulk materials that cannot be processed with complex shapes, and limit the selection range of seed crystals, etc. problem, to achieve the effect of strong plasticity, easy operation and good orientation

Inactive Publication Date: 2009-09-30
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the traditional osmosis process, the fluid source is Ba 3 Cu 5 o x The powder and Y123 powder are mixed and pressed into a tablet. Since the fluid source contains Y123, in order to decompose Y123, the highest temperature needs to be raised above the peritectic reaction temperature, which limits the selection range of seed crystals.
[0004] In addition, the traditional infiltration process can only process cylindrical superconducting bulk materials, but cannot process high-temperature superconducting bulk materials with complex shapes.
[0005] For example, the document High-performance single grain Y Ba Cu O bulk superconductorfabricated by seeded infiltration and growth (Physica C 445-448 (2006) 277-281) introduced a top seed crystal infiltration method to prepare high-performance single-domain YBCO superconductor bulk The material method, in which the highest temperature reaches 1045°C, limits the selection range of seed crystals, and can only process cylindrical superconducting bulk materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: With Ba 3 Cu 5 o x Growth of YBCO superconducting bulk by infiltration method using powder as fluid source

[0022] 1. Press Y211 powder into Circular precursor sheet with a size of 2×2×1mm placed on top 3 SmBCO as the seed crystal.

[0023] 2. Put 25 grams of Ba in the bottom of the crucible 3 Cu 5 o x Powder, compacted.

[0024] 3. Put the precursor sheet pressed in step 1 on the zirconia bead substrate, put it into the crucible, and place it in Ba 3 Cu 5 o x On powder, the whole system is placed in a sealed system.

[0025] 4. Raise the temperature to 950°C in 3 hours, keep it warm for 1 hour, raise the temperature to 1000°C in 2 hours, and keep it warm for 1 hour.

[0026] 5. Lower the temperature to 990°C within 30 minutes, then lower the temperature at a rate of 0.5°C per hour to 978°C for 24 hours, and finally cool down with the furnace to obtain a superconducting YBCO bulk material.

Embodiment 2

[0027] Embodiment 2: With Ba 3 Cu 5 o x Growth of YBCO superconducting bulk by infiltration method using powder as fluid source

[0028] 1. Press the Y211 powder into a spherical precursor sheet with a diameter of 10mm, and place a 2×2×1mm on top 3 SmBCO as the seed crystal;

[0029] 2. Put 25 grams of Ba in the bottom of the crucible 3 Cu 5 o x powder, compacted

[0030] 3. Put the precursor sheet pressed in step 1 on the zirconia bead substrate, put it into the crucible, and place it in Ba 3 Cu 5 o x On powder, the whole system is placed in a sealed system.

[0031] 4. Raise the temperature to 945°C in 2.5 hours, keep it warm for 1.5 hours, raise the temperature to 1005°C in 2 hours, and keep it warm for 2 hours.

[0032] 5. Lower the temperature to 995°C within 20 minutes, then lower the temperature to 977°C at a rate of 0.6°C per hour for 30 hours, and finally cool down with the furnace to prepare a superconducting YBCO bulk material.

Embodiment 3

[0033] Embodiment 3: with Ba 3 Cu 5 o x Growth of YBCO superconducting bulk by infiltration method using powder as fluid source

[0034] 1. Press Y211 powder into Circular precursor sheet with a size of 2×2×1mm placed on top 3 SmBCO as the seed crystal;

[0035] 2. Put 35 grams of Ba in the bottom of the crucible 3 Cu 5 o x powder, compacted

[0036] 3. Put the precursor sheet pressed in step 1 on the zirconia bead substrate, put it into the crucible, and place it in Ba 3 Cu 5 o x On the powder, the whole system is placed in a sealed system;

[0037] 4. Raise the temperature to 945°C in 3 hours, keep it warm for 1 hour, raise the temperature to 998°C in 1.5 hours, and keep it warm for 2 hours.

[0038]5. Lower the temperature to 988°C within 30 minutes, then lower the temperature at a rate of 0.3°C per hour to 976°C for 40 hours, and finally cool down with the furnace to prepare a superconducting YBCO bulk material.

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Abstract

The invention relates to a method for preparing a yttrium barium copper oxygen superconducting block material by taking Ba3Cu5Ox powder as fluid, which can realize the processing of a YBCO superconductor block material in a complicated shape. The method comprises the following steps that: firstly, the Y211 powder is pressed into a precursor sheet; a SmBCO single crystal is arranged on the top of the precursor as a seed crystal; and by taking the Ba3Cu5Ox powder as a fluid source, the high-temperature superconducting YBCO block material is prepared by a top seed crystal permeability method. The method has the advantages of simple process and easy operation, and can grow the high-temperature superconducting YBCO block material in the complicated shape which has good orientation as well as big single domain structure under the conditions of no impurity and fully matched crystal lattice, and solve the key problem of growth and application of the high-temperature superconducting block material.

Description

technical field [0001] The invention relates to a preparation method of a yttrium-barium-copper-oxygen superconducting bulk material, in particular to a method using Ba 3 Cu 5 o x The powder is used as the infiltration method of the fluid source to prepare the YBCO superconducting bulk material, so as to realize the method of processing the complex shape YBCO superconducting bulk material. Background technique [0002] The top-seed infiltration method (SIG) 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 ) and complex shapes. This method can well maintain the original shap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B1/10C04B35/45C04B35/50
Inventor 姚忻李天宇
Owner SHANGHAI JIAO TONG UNIV
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