Method for improving single domain YBCO superconducting block critical current

Abstract

The invention relates to a method for increasing the critical current of a single domain YBCO superconducting block, which belongs to the field of functional materials. The method is characterized by comprising the following steps: doping SiO2 nanometer powder of which the grain size is between 20 and 100 nanometers to pioneer powder of the single domain YBCO superconducting block; adding SiO2 nanometer powder which is 0.02 to 1 weight percent of the pioneer powder of the YBCO superconducting block to the pioneer powder; performing compression molding with a single shaft on the mixture after the mixture is mixed evenly through ball milling; and generating the single domain structured YBCO superconducting block by adopting a top seed assisted melt texture growth process (TSMTG). The process for preparing the SiO2 nanometer powder comprises the following steps: preparing a clear and transparent solution from tetraethyl orthosilicate, anhydrous ethanol and deionized water according to the volume ratio of 1 to 1-3 to 1-3, and forming a milky gel after water bath and stirring; and forming a dried gel and grinding the dried gel into fine powder, and baking the fine powder at a temperature of between 400 and 700 DEG C for 0.5 to 2.5 hours to obtain the SiO2 nanometer powder of which the grain size is between 20 and 100 nanometers. The method effectively increases the critical current the single domain YBCO superconducting block within a wide field range.

Description

technical field [0001] The invention relates to a method for increasing the critical current of a monodomain yttrium barium copper oxide (YBCO) superconducting block, which belongs to the field of functional materials. Background technique [0002] The melt-textured YBCO superconducting bulk can capture high magnetic fields. And it is expected to be used in flywheel energy storage, motor rotor, high-performance magnetic source, maglev device, etc. Although people have obtained a relatively high critical current density. But practical industrial applications require higher critical current densities, especially at high fields. Since the coherence length of type II superconductors is only a few nanometers. Accordingly, efforts in this area have focused on chemical doping and adding non-superconducting nanoparticles as the second phase of the Y123 matrix. For example: On the one hand, non-magnetic ions (such as Li+) replace CuO 2 Cu ions on the surface; magnetic ions (such...

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Problems solved by technology

The critical current density under the self-field can be increased by nearly 20000A / cm 2 , Unfortunately, the critical current density under high field (2T) only increased by nearly 5000A / cm 2

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