Method for inversely growing REBCO block

A RE2O3, growth furnace technology, applied in the field of inverted growth REBCO blocks, can solve the problems of component deviation and spontaneous nucleation, and achieve the effects of preventing pollution, reducing stress, and simple and convenient operation.

Inactive Publication Date: 2014-12-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 REBC

Method used

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  • Method for inversely growing REBCO block
  • Method for inversely growing REBCO block
  • Method for inversely growing REBCO block

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A method for growing REBCO blocks upside down in this embodiment, wherein REBCO is YBCO, comprising the following steps:

[0048] 1. According to the molar ratio of Y:Ba:Cu=1:2:3 and 2:1:1 respectively, Y 2 o 3 、BaCO 3 Mix with CuO powder to obtain the precursor powder of Y123 phase and Y211 phase, then grind the precursor powder of Y123 phase and the precursor powder of Y211 phase fully and evenly, sinter in air at 900°C for 48 hours, grind the sintered powder again, Sintering at 900°C in air for 48 hours, repeated three times, to obtain pure phase powders of Y123 and Y211 with uniform and single components.

[0049] 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 batched according to the mass ratio of 1:1%. After fully grinding and mixing, take 10g of the mixed powder for later use; select the seed crystal material of the c-axis oriented NdBCO / YBCO / MgO film with a size of 2...

Embodiment 2

[0060] A method for growing YBCO blocks upside down, comprising the following steps:

[0061] 1. According to the molar ratio of Y:Ba:Cu=1:2:3 and 2:1:1 respectively, Y 2 o 3 、BaCO 3 Mix with CuO powder to obtain the precursor powder of Y123 phase and Y211 phase, then grind the precursor powder of Y123 phase and the precursor powder of Y211 phase fully and evenly, sinter in air at 900°C for 48 hours, grind the sintered powder again, Sintering at 900°C in air for 48 hours, repeated three times, to obtain pure phase powders of Y123 and Y211 with uniform and single components.

[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 batched according to the mass ratio of 1:1%. After fully grinding and mixing, take 10g of the mixed powder for later use; select the seed crystal material of the c-axis oriented NdBCO / YBCO / MgO film with a size of 2mm×2mm, and make the film The induced grow...

Embodiment 3

[0070] A method for growing YBCO blocks upside down, comprising the following steps:

[0071] 1. According to the molar ratio of Y:Ba:Cu=1:2:3 and 2:1:1 respectively, Y 2 o 3 、BaCO 3 Mix with CuO powder to obtain the precursor powder of Y123 phase and Y211 phase, then grind the precursor powder of Y123 phase and the precursor powder of Y211 phase fully and evenly, sinter in air at 900°C for 48 hours, grind the sintered powder again, Sintering at 900°C in air for 48 hours, repeated three times, to obtain pure phase powders of Y123 and Y211 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 batched according to the mass ratio of 1:1%. After fully grinding and mixing, take 10g of the mixed powder for later use; select the seed crystal material of the c-axis oriented NdBCO / YBCO / MgO film with a size of 2mm×2mm, and make the film The induced grow...

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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 a high-temperature superconducting material, in particular to a method for growing REBCO blocks upside down. 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 research work, it is of great significance to explore the growth method of REBCO blocks. The traditional method of preparing REBCO bulk is to use the top seed melt texture method, which has an unavoidable disadvantage of liquid loss, which easily leads to comp...

Claims

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Application Information

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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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