Preparation method of pagoda-shaped large-scale rebco high-temperature superconducting bulk

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...

AI Technical Summary

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 p Growth of SmBCO and NdBCO bulk

Moreover, this method is relatively cumbersome, and it needs to grow larger-sized SmBCO block seeds in advance before it can be further used to induce the growth of large-size YBCO blocks.

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