A method of growing rebco blocks upside down

A technology of RE2O3 and growth furnace, which is applied in the field of inverted growth of REBCO blocks, can solve the problems of spontaneous nucleation and component deviation, and achieve the effects of preventing pollution, reducing stress and being easy to prepare

Inactive Publication Date: 2017-05-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method for growing REBCO blocks upside down, which is used to solve the problems of component deviation and spontaneous nucleation caused by liquid loss in the prior art

Method used

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  • A method of growing rebco blocks upside down
  • A method of growing rebco blocks upside down
  • A method of growing rebco blocks upside down

Examples

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Embodiment 1

[0047] In this embodiment, a method for growing REBCO bulk materials upside down, wherein REBCO is YBCO, includes the following steps:

[0048] 1. Respectively according to the molar ratio of Y:Ba:Cu=1:2:3 and 2:1:1, the Y 2 O 3 , BaCO 3 Mix with CuO powder to obtain the precursor powders of Y123 and Y211 phases. Then, the precursor powders of Y123 phase and Y211 phase are fully ground and sintered in air at 900°C for 48 hours. The sintered powders are ground again. Sintering at 900°C for 48 hours in air was repeated three times to obtain Y123 and Y211 pure phase powders with uniform composition.

[0049] 2. Mix the pure phase powders of Y123 and Y211 in a molar ratio of 1:30%, and then mix the mixed powder with CeO 2 The powder is mixed according to the components of 1:1% by mass, and after fully grinding and mixing, take 10g of the mixed powder for use; select the seed material of the c-axis oriented NdBCO / YBCO / MgO film with a size of 2mm×2mm, and the film The induced growth surf...

Embodiment 2

[0060] A method for growing YBCO bulk material upside down, including the following steps:

[0061] 1. According to the molar ratios of Y:Ba:Cu=1:2:3 and 2:1:1, the Y 2 O 3 , BaCO 3 Mix with CuO powder to obtain the precursor powders of Y123 and Y211 phases, and then fully grind the precursor powders of Y123 phase and Y211 phase and sinter them in the air at 900°C for 48 hours. The sintered powders are ground again, Sintering at 900°C for 48 hours in air was repeated three times to obtain Y123 and Y211 pure phase powders with uniform composition.

[0062] 2. Mix the pure phase powders of Y123 and Y211 according to the molar ratio of 1:30%, and then mix the mixed powder with CeO 2 The powder is mixed according to the components of 1:1% by mass, and after fully milling and mixing, take 10g of the mixed powder for use; select the seed crystal material of the c-axis oriented NdBCO / YBCO / MgO film with a size of 2mm×2mm. The induced growth surface of the seed crystal (the side with the Nd...

Embodiment 3

[0070] A method for growing YBCO bulk material upside down, including the following steps:

[0071] 1. Respectively according to the molar ratio of Y:Ba:Cu=1:2:3 and 2:1:1, the Y 2 O 3 , BaCO 3 Mix with CuO powder to obtain the precursor powders of Y123 and Y211 phases, and then fully grind the precursor powders of Y123 phase and Y211 phase and sinter them in the air at 900°C for 48 hours. The sintered powders are ground again, Sintering at 900°C for 48 hours in air was repeated three times to obtain Y123 and Y211 pure phase powders with uniform and single components.

[0072] 2. Mix the pure phase powders of Y123 and Y211 according to the molar ratio of 1:30%, and then mix the mixed powder with CeO 2 The powder is mixed according to the components of 1:1% by mass, and after fully milling and mixing, take 10g of the mixed powder for use; select the seed crystal material of the c-axis oriented NdBCO / YBCO / MgO film with a size of 2mm×2mm. The induced growth surface of the seed crystal...

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Abstract

The invention provides a method for inversely growing REBCO block. The method comprises the following steps: preparing powder of an RE123 phase and powder of an RE211 phase; preparing an embedded seed precursor: uniformly mixing the powder of the RE123 phase and the powder of the RE211 phase in a ratio of RE123 + 30mol% RE211 + (0.3-0.5) wt% CeO2, pressing to form a cylindrical precursor, and in the pressing process, horizontally and fixedly embedding seed crystal into a central area of the upper surface of the precursor to form the embedded seed precursor; inverting the embedded seed precursor on the surface of an unpolished MgO substrate, and growing the REBCO block in a growing furnace through the fusion texture method. By the method, liquid loss of the precursor can be effectively inhibited, component deviation and spontaneous nucleation can be reduced, pollution can be prevented, stress can be reduced, and thus preparation of the REBCO block is facilitated.

Description

Technical field [0001] The invention relates to a method for growing high-temperature superconducting materials, in particular to a method for growing REBCO bulk materials upside down. Background technique [0002] From 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 the characteristics of complete diamagnetism, high critical current density and high freezing magnetic field, REBCO superconductors have many potential applications in areas such as magnetic levitation, magnetic bearings, flywheel energy storage and permanent magnets. [0003] For further research work, exploring the growth method of REBCO bulk material is of great significance. The traditional method of preparing REBCO bulk material is to use the top seed crystal melt texture method. An unavoidable disadvantage of this method is liquid loss, which easily ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/22C30B19/12C04B35/45C04B35/622
Inventor 李昊辰樊文硕王伟郭林山相辉崔祥祥张乐天姚忻
Owner SHANGHAI JIAO TONG UNIV
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