Method for growing REBCO high-temperature superconductor

A high-temperature superconducting and growth furnace technology, applied in the direction of single crystal growth, crystal growth, single crystal growth, etc., can solve the problems of unsatisfactory Y211 particle content, large RE211 particles, time-consuming and labor-intensive, etc., to achieve inhibition of dissolution and diffusion, The effect of increasing concentration and improving thermal stability

Inactive Publication Date: 2015-12-23
SHANGHAI JIAO TONG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, in the traditional growth method, we need to prepare Y 2 BaCuO 5 (Y211), YBa 2 Cu 3 o y (Y123) and other powders, the process is complicated and time-consuming, and the content of Y211 particles in the sample is not satisfactory
[0004] At present, the top-seed melt texture method (MT) can effectively prepare large-sized REBCO superconducting bulk materials, and has become a kind of REBCO high-temperature superconducting material with great potential because of its easy preparation, high doping and reliable growth. Material preparation method, but usually by doping a certain amount of RE211 phase, which makes the RE211 particles in the sample large and high in content

Method used

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  • Method for growing REBCO high-temperature superconductor
  • Method for growing REBCO high-temperature superconductor
  • Method for growing REBCO high-temperature superconductor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A method for growing YBCO high-temperature superconducting bulk material, comprising the following steps:

[0050] 1. According to the molar ratio of Ba:Cu=2:3, BaCO 3 Mix with CuO powder to get BaCO 3 +CuO powder;

[0051] 2. To the BaCO described in step 1 3 +CuO powder is mixed with absolute ethanol and then wet-milled to obtain BaCO 3 +CuO slurry, wet grinding time is 2-4 hours;

[0052] 3. Dry the BaCO obtained in step 2 3 +CuO slurry to prepare Ba 2 Cu 3 o 5 powder;

[0053] 4. Put the Ba in step 3 2 Cu 3 o 5 The powder was sintered in the air at 900°C for 48 hours and this grinding and sintering process was repeated twice to finally obtain Ba 2 Cu 3 o 5 powder.

[0054] 5. The Ba obtained in step 4 2 Cu 3 o 5 Powder according to 0.75Y 2 o 3 +Ba 2 Cu 3 o 5 +(0.3~1.5)wt%CeO 2 After fully grinding and mixing the ingredients, take 10g of the mixed powder and put it into the mold.

[0055] 6. Use the embedded seed crystal method to press the p...

Embodiment 2

[0064] A method for growing NdBCO high-temperature superconducting bulk material, comprising the following steps:

[0065] 1. According to the ratio of Ba: Cu = 2: 3, BaCO 3 Mix with CuO powder to get BaCO 3 +CuO powder;

[0066] 2. To the BaCO described in step 1 3+CuO powder is mixed with absolute ethanol and then wet-milled to obtain BaCO 3 +CuO slurry, wet grinding time is 2-4 hours;

[0067] 3. Dry the BaCO obtained in step 2 3 +CuO slurry to prepare Ba 2 Cu 3 o 5 powder;

[0068] 4. Put the Ba in step 3 2 Cu 3 o 5 The powder was sintered in the air at 900°C for 48 hours and this grinding and sintering process was repeated twice to finally obtain Ba 2 Cu 3 o 5 powder.

[0069] 5. The Ba obtained in step 4 2 Cu 3 o 5 Powder press 0.75Nd 2 o 3 +Ba 2 Cu 3 o 5 +(0.3~1.5)wt%CeO 2 After fully grinding and mixing the ingredients, take 10g of the mixed powder and put it into the mold.

[0070] 6. Use the embedded seed crystal method to press the powder de...

Embodiment 3

[0078] A method for growing SmBCO high-temperature superconducting bulk material, comprising the following steps:

[0079] 1. According to the ratio of Ba: Cu = 2: 3, BaCO 3 Mix with CuO powder to get BaCO 3 +CuO powder;

[0080] 2. To the BaCO described in step 1 3 +CuO powder is mixed with absolute ethanol and then wet-milled to obtain BaCO 3 +CuO slurry, wet grinding time is 2-4 hours;

[0081] 3. Dry the BaCO obtained in step 2 3 +CuO slurry to prepare Ba 2 Cu 3 o 5 powder;

[0082] 4. Put the Ba in step 3 2 Cu 3 o 5 The powder was sintered in the air at 900°C for 48 hours and this grinding and sintering process was repeated twice to finally obtain Ba 2 Cu 3 o 5 powder.

[0083] 5. The Ba obtained in step 4 2 Cu 3 o 5 Powder by 0.75Sm 2 o 3 +Ba 2 Cu 3 o 5 +(0.3~1.5)wt%CeO 2 After fully grinding and mixing the ingredients, take 10g of the mixed powder and put it into the mold.

[0084] 6. Use the embedded seed crystal method to press the powder desc...

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Abstract

The invention provides a method for growing an REBCO high-temperature superconductor, which comprises the following procedures: (a) preparing Ba2Cu3O5 powder according to the molar ratio of Ba:Cu=2:3; (b) preparing a precursor according to the proportion of (0.55-0.8)RE2O3+Ba2Cu3O5+(0.3-1.5)wt% CeO2; and (c) putting the precursor in a growth furnace, and growing the REBCO high-temperature superconductor by a seed crystal-induced melting texturing method, wherein the precursor in the procedure (b) is a cylindrical precursor formed by uniformly mixing the Ba2Cu3O5 powder obtained in the procedure (a) according to the proportion of (0.55-0.8)RE2O3+Ba2Cu3O5+(0.3-1.5)wt% CeO2 and then pressing. According to the invention, the Ba2Cu3O5 powder prepared according to the molar ratio of Ba:Cu=2:3 is directly used in the precursor, and RE123 powder and RE211 powder are not prepared, so that the time and process costs are saved, and the proportion of all elements in the whole growing process keeps that the molar ratio of RE123 to RE211 is approximately equal to 1:(0.1-0.4), thereby obtaining the REBCO high-temperature superconductor.

Description

technical field [0001] The invention relates to the field of high-temperature superconducting materials, and more specifically, relates to a method for growing REBCO high-temperature superconducting bulk materials. 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. Due to its 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] Top-seed infiltration growth (TSIG) and top-seed melt growth (TSMG) are common methods for preparing superconducting single crystal bulk. However, in the traditional growth method, we need to prepare Y 2 BaCuO 5 (Y211), YBa 2 Cu 3 o y (Y123) and other p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B1/02
Inventor 姚忻相辉潘彬崔祥祥钱俊
Owner SHANGHAI JIAO TONG UNIV
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