Preparation method of pagoda-shaped large-size REBCO (RE-Ba-Cu-O) high-temperature superconductor block

A high-temperature superconducting, pagoda-shaped technology, applied in chemical instruments and methods, crystal growth, self-solidification, etc., can solve the problems of large size and cumbersomeness, and achieve the effect of no influence on superconducting performance

Inactive Publication Date: 2013-04-03
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the peritectic reaction temperature (T p ) is different, only high T can be used at present p The SmBCO bulk acts as a seed to induce the growth of a low T p YBCO, but cannot carry out large size, high T ...

Method used

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  • Preparation method of pagoda-shaped large-size REBCO (RE-Ba-Cu-O) high-temperature superconductor block
  • Preparation method of pagoda-shaped large-size REBCO (RE-Ba-Cu-O) high-temperature superconductor block
  • Preparation method of pagoda-shaped large-size REBCO (RE-Ba-Cu-O) high-temperature superconductor block

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Embodiment 1

[0042] 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 Sm123 phase and Sm211 phase powder, mix Sm according to the ratio of Sm:Ba:Cu=2:4:2 2 o 3 、BaO 2 Mix with CuO powder to obtain Sm242 phase powder, mix Sm according to the ratio of Sm:Ba:Cu:Bi=2:4:1:1 2 o 3 、BaCO 3 , CuO and Bi 2 o 3 The powders were mixed to obtain the Sm2411 phase powder.

[0043] 2. After fully grinding the Sm123 phase powder, Sm211 phase powder, Sm242 phase powder and Sm2411 phase powder respectively, sinter the Sm123 phase powder, Sm211 phase powder and Sm2411 phase powder in the air atmosphere for 48 hours , the corresponding sintering temperatures are 900°C, 900°C and 950°C respectively; 2 In the atmosphere, sintering for 24h, the sintering temperature is 850 ℃. The sintered powder was ground and sintered again, and repeated three times to obtain Sm123 pure-phase powder, Sm211 pure-phase powder, Sm242 pure-phase powder and ...

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Abstract

The invention discloses a preparation method of a pagoda-shaped large-size REBCO (RE-Ba-Cu-O) high-temperature superconductor block. The preparation method comprises the following steps of: taking a c-axis oriented NdBCO/YBCO (Yttrium Barium Copper Oxide)/MgO film as a seed crystal, enabling an ab surface of the film seed crystal to be in contact with the upper surface of a precursor block, and putting the pagoda-shaped precursor block and the film seed crystal in a growth furnace to carry out fusion structure growth. The invention also discloses the pagoda-shaped large-size REBCO high-temperature superconductor block, which is a pagoda-shaped single-domain block and is free of weak connection of crystal boundaries. The preparation method of the pagoda-shaped large-size high-temperature superconductor block has the advantages that no spontaneous nucleation is generated due to application of an accelerated cooling method, the growth speed is high, and no seed crystal block needs to grow in advance, and can be used for growth of various REBCO high-temperature superconductor blocks and doping growth REBCO blocks. In addition, the preparation method is simple, easy to operate and is available in repeatability and controllability.

Description

technical field [0001] The invention relates to a preparation method of a high-temperature superconducting material, in particular to a preparation method of a pagoda-shaped large-size REBCO high-temperature superconducting block. Background technique [0002] Since REBa 2 Cu 3 o x (referred to as REBCO, RE123, rare earth barium copper oxide) superconductors have attracted widespread attention since they were discovered. Due to its complete diamagnetism, high critical current density, and high freezing magnetic field, REBCO superconducting bulk materials have many potential applications in areas such as magnetic levitation forces, magnetic bearings, flywheel energy storage, and permanent magnets. The performance parameters involved in these applications mainly depend on the freezing magnetic field capability of the superconducting material, and the freezing magnetic field capability is closely related to the macroscopic and microscopic structure of the material. Therefor...

Claims

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Application Information

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IPC IPC(8): C30B29/22C30B11/00
Inventor 姚忻彭波南程玲庄宇峰许恒恒郭林山王伟
Owner SHANGHAI JIAO TONG UNIV
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