Method for preparing single-domain yttrium-barium-copper-oxygen superconducting block in liquid-phase source coated infiltration growing manner

Abstract

The invention discloses a method for preparing a single-domain yttrium-barium-copper-oxygen superconducting block in a liquid-phase source coated infiltration growing manner, which comprises the following steps: preparation of Y2BaCuO5 precursor powder, preparation of liquid-phase source powder, pressing of a precursor block, assembling of the precursor block, infiltration growing of the single-domain yttrium-barium-copper-oxygen superconducting block and oxygen diffusion treatment. By using BaO and CuO mixed powder Ba3Cu5O8 as a liquid-phase source, the whole infiltration growing process only needs the Y2BaCuO5 precursor powder, thereby simplifying the experiment procedure, shortening the experiment period and improving the preparation efficiency. By adopting the liquid-phase source coated Y2BaCuO5 solid-phase block molding manner, the permeation of the liquid phase from the bottom surface and the side surface of the sample can be realized at high temperature, thereby being more beneficial to full growth of the sample. Besides, by adopting the liquid-phase source coated Y2BaCuO5 solid-phase block molding manner, the height of the whole sample is greatly reduced, and the sample is easier to keep upright at high temperature, so that incline or collapse of the sample can be avoided, thereby improving the stability and repeatability of the infiltration growing method.

Description

technical field [0001] The invention belongs to the technical field of high-temperature copper oxide superconducting materials, and in particular relates to a method for preparing monodomain yttrium-barium-copper-oxygen superconducting block materials by coating infiltration growth with a liquid phase source. Background technique [0002] Single-domain rare earth-based copper oxide high-temperature superconducting bulk materials (RE-Ba-Cu-O, where RE is rare earth elements, such as Y, Gd, Sm, Nd, etc.) have high transition temperature, critical current density and strong The magnetic flux pinning ability can show a strong ability to capture magnetic flux, a large magnetic levitation force performance and good self-stable magnetic levitation characteristics. This advantage has laid the foundation for the application of this type of material, especially in superconducting strong magnets, magnetic suspension bearings, energy storage flywheels, superconducting motors, generators...

AI Technical Summary

Problems solved by technology

In the current TSIG process, people generally put RE 2 BaCuO 5 The solid phase block is placed on top of the Ba and Cu-rich liquid phase source auxiliary block, and during the high-temperature heat treatment process, due to the consumption of liquid phase components, the diameter of the liquid phase source block will shrink severely, making it unable to support it well. Therefore, the sample often tilts or collapses, which limits the popularization and use of the TSIG preparation process

Also, since the liquid source block is placed in the RE 2 BaCuO 5 The bottom of the solid phase block, so the transfer of the liquid phase to the solid phase block can only be carried out from bottom to top through the bottom surface of the solid phase block

This assembly method is conducive to the growth of the solid phase block to the bottom of the sample, but for the growth of the solid phase block to the outer edge of the sample, this single-direction liquid phase penetration method is still insufficient

Because when the seed-guided REBa 2 Cu 3 o 7-δ When the single-domain region grows to a certain size, the communication channel between the ungrown region on the side and the liquid source below becomes narrow, so that the supply of liquid phase, RE 2 BaCuO 5 The discharge of particles into the liquid phase becomes difficult, which will reduce the REBa 2 Cu 3 o 7-δ The rate at which the monodomain continues to grow, making it difficult for the complete growth of the sample

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