Method for inducing growth of REBCO superconducting block by using single seed crystal bridge structure

Abstract

The invention provides a method for inducing growth of a REBCO superconducting block by using a single seed crystal bridge structure.The method comprises the following steps of: preparing RE123 and RE211 pure-phase powder, proportioning according to the components of RE123, 30mol% of RE211 and 1wt% of CeO2, fully grinding and uniformly mixing to obtain precursor powder; according to different diameters of molds, weighing proper mass of the powder, putting the powder into the molds, and pressing the powder into one cylindrical seed crystal bridge, 2-3 buffer layers and one precursor; sequentially placing the seed crystal, the seed crystal bridge, the buffer layer and the precursor from top to bottom; making the seed crystal, the seed crystal bridge and the buffer layers form the single seed crystal bridge type structure, wherein the seed crystal is placed in the center of the upper surface of the seed crystal bridge, the seed crystal bridge is erected above the buffer layers, and the buffer layers are arranged in a row along the crystal orientation of the seed crystal [110]; and placing the placed precursor and the single seed crystal bridge structure in a growth furnace to perform top seed crystal melt texture growth so as to realize (110)//(110) oriented induced growth of the REBCO superconducting block.

Description

technical field [0001] The invention belongs to the technical field of superconducting material growth methods, and in particular relates to a method for realizing (110)∥(110) orientation-induced growth of REBCO superconducting block material by using a thin film seed crystal combined with a bridge structure. Background technique [0002] Since REBa 2 Cu 3 o 7-δ (referred to as REBCO, RE123, rare earth barium copper oxide, wherein RE is selected from Y, Gd, Sm, Nd, etc.) Since the discovery of high-temperature superconductors, due to their complete diamagnetism, high critical current density and high freezing magnetic field, etc. Huge commercial potential, such as flywheel energy storage, permanent magnets, magnetic levitation force elements, etc., have attracted widespread attention. As an inevitable prerequisite for application, the preparation of REBCO blocks with large size and high performance is a problem that must be solved. So far, the Top-Seeded Melt Textured Gr...

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Problems solved by technology

However, the study found that because the traditional multi-seed method is generally placed at (100)∥(100), a large number of non-superconducting phases will remain at the grain boundaries of the sample, which will hinder the superconducting current loop from passing through the grain boundaries, and eventually lead to multiple superconducting phases in the sample. A small superconducting current loop instead of a whole large superconducting current loop, the overall performance is greatly reduced

At the same time, in the traditional multi-seed crystal equidistant placement induced bulk preparation process, as the number of seed crystals used increases, the weak connection of the grain boundary inside the bulk material will be further reduced, thereby reducing the superconducting performance of the bulk material

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