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Method for growing rebco bulk material by using flake rebco single crystal

A RE2O3, flake technology, applied in the field of using flake REBCO single crystal as seed crystal to induce growth of REBCO bulk material, can solve the problem of high cost, achieve enhanced wettability, easy preparation, and high crystal quality

Inactive Publication Date: 2019-01-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the cost of the aforementioned seed materials is still high for large-scale production of REBCO materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of method utilizing flake-like YBCO single crystal as seed crystal induced growth YBCO bulk material, comprises following procedure:

[0031] 1. According to the molar ratio of Y:Ba:Cu=1:2:3 and Y:Ba:Cu=2:1:1, Y 2 o 3 、BaCO 3 Mixed with CuO powder to obtain powder of Y123 phase and Y211 phase.

[0032] 2. After the Y123 phase powder and the Y211 phase powder in step 1 are fully ground and uniform, sintered at 900°C in the air for 48 hours, the sintered powder is ground again, and sintered at 900°C in the air for 48 hours. Repeat three times to obtain Uniform and single Y123 pure phase powder, Y211 pure phase powder.

[0033] 3. The Y123 pure phase powder, Y211 pure phase powder and CeO obtained in step 2 2 Powder according to Y123+30mol%Y211+1wt%CeO 2 After fully grinding and mixing the ingredients, take 10g of mixed powder for later use.

[0034] 4. Select a c-axis-oriented flaky YBCO single crystal with a size of 2mm×2mm×1mm as the seed crystal, place the...

Embodiment 2

[0043] A method of using thin-flaky YBCO single crystals as seed crystals to induce the growth of GdBCO bulk materials, comprising the following steps:

[0044] 1. According to the ratio of Gd:Ba:Cu=1:2:3 and Gd:Ba:Cu=2:1:1, Gd 2 o 3 、BaCO 3 Mix with CuO powder to obtain Gd123 phase and Gd211 phase powder.

[0045] 2. Grind the Gd123 phase powder and Gd211 phase powder in step 1 fully and evenly, sinter in air at 900°C for 48 hours, grind the sintered powder again, and sinter in air at 900°C for 48 hours, repeat three times to obtain Uniform and single Gd123 pure phase powder, Gd211 pure phase powder.

[0046] 3. The Gd123 pure phase powder, Gd211 pure phase powder and CeO obtained in step 2 2 Powder according to Gd123+30mol%Gd211+1wt%CeO 2 After fully grinding and mixing the ingredients, take 10g of mixed powder for later use.

[0047] 4. Select a c-axis-oriented thin YBCO single crystal with a size of 2mm×2mm×1mm as the seed crystal, place the induced growth surface a-...

Embodiment 3

[0056] A method for inducing the growth of a SmBCO bulk material using a flaky SmBCO single crystal as a seed crystal, comprising the following steps:

[0057] 1. According to the ratio of Sm:Ba:Cu=1:2:3 and Sm:Ba:Cu=2:1:1, the Sm 2 o 3 、BaCO 3 Mix with CuO powder to obtain powder of Sm123 phase and Sm211 phase.

[0058] 2. Grind the powder of Sm123 phase and the powder of Sm211 phase in step 1 fully and evenly, sinter in air at 900°C for 48 hours, grind the sintered powder again, and sinter in air at 900°C for 48 hours, repeat three times to obtain Sm123 pure phase powder and Sm211 pure phase powder with uniform and single components.

[0059] 3. The Sm123 pure phase powder, Sm211 pure phase powder and CeO obtained in step 2 2 Powder according to Sm123+30mol%Sm211+1wt%CeO 2 After fully grinding and mixing the ingredients, take 10g of mixed powder for later use.

[0060] 4. Select a c-axis-oriented thin SmBCO single crystal with a size of 2mm×2mm×1mm as the seed crystal,...

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Abstract

The invention provides a method for growing REBCO blocks by using sheet REBCO monocrystals. The method comprises the following steps: 1, preparing powders of an RE123 phase and RE211 phase; 2, preparing an embedded seed crystal precursor according to a ratio of RE123 + (15-30)mol% RE211 + (0.3-1.5)wt% CeO2 with the sheet REBCO blocks as seed crystals; and 3, placing the embedded seed crystal precursor in a growth furnace, and carrying out melt texture growth to obtain the blocks, wherein the sheet REBCO monocrystals are obtained through dissociation of the REBCO monocrystals along a-b surface; and the thickness of the sheet REBCO monocrystals along a c-axis direction is 0.05-2mm, and the dimension of the sheet REBCO monocrystals along the a-b surface is 2mm*2mm ~ 10mm*10mm. The invention provides an REBCO seed crystal material. The REBCO seed crystal material has the advantages of low cost, simple preparation and high yield, and the REBCO high temperature superconductive blocks are prepared on the basis of the melt texture growth in order to meet scientific research and practical industrial production demands.

Description

technical field [0001] The invention relates to a high-temperature superconducting material, in particular to a method for inducing the growth of a REBCO bulk material by using a flaky REBCO single crystal as a seed crystal. Background technique [0002] Since REBa 2 Cu 3 o x (referred to as REBCO, RE123, rare earth barium copper oxide, RE=Y, Gd, Sm, Nd, etc.) superconductors have attracted widespread attention since they were discovered. Thanks to REBa 2 Cu 3 o x With properties such as complete diamagnetism, high critical current density, and high freezing magnetic field, REBCO superconductors have many potential applications in areas such as magnetic levitation forces, magnetic bearings, flywheel energy storage, and permanent magnets. [0003] For further scientific research work, the seed crystal, which is used to provide growth nucleation sites, control growth orientation, and inhibit spontaneous nucleation, is very important for crystal growth. The growth of REB...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/22C30B13/34H01B12/00
CPCC30B13/34C30B29/225H01B12/00Y02E40/60
Inventor 姚忻相辉崔祥祥钱俊刘艳潘彬
Owner SHANGHAI JIAO TONG UNIV