Preparation method of high temperature superconducting film

Abstract

The invention relates to a preparation method of a high temperature superconducting film. The preparation method comprises the specific steps of weighting rear earth metal salt, barium salt and copper salt according to a proportion and dispersing in a solvent so as to prepare and obtain a precursor parent; adding a polymer to the precursor parent and stirring so as to obtain a modified precursor; providing a substrate and coating the modified precursor on the substrate so as to form a precursor film; placing the precursor film in a thermal treatment furnace, raising the furnace temperature to 300 DEG C-650 DEG C rapidly and holding the temperature for 0-60 minutes; raising the furnace temperature to 730 DEG C-825 DEG C and holding the temperature for 20-250 minutes; and lowering the furnace temperature to 400 DEG C-500 DEG C and holding the temperature for 0-240 minutes. According to the preparation method, not only can the high temperature superconducting film which has a compact and smooth surface and excellent superconductivity be prepared, but also the preparation rate of the high temperature superconducting film can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of high-temperature superconducting material preparation, in particular to a method for preparing a high-temperature superconducting film by using a chemical solution deposition technique. Background technique [0002] Rare earth barium copper oxide (REBa 1+x Cu 3 o 7-y , where RE is a rare earth element such as Y, Gd, Sm, etc., 0.5≤x≤1, 0<y<0.5) The high-temperature superconducting film is the core component of the second-generation high-temperature superconducting wire (also known as a coated conductor) part, it has a very high self-field critical current density (generally higher than 1 MA / cm 2 ), and is suitable for applications in high magnetic field environments. The current technology for preparing high-temperature superconducting films mainly includes chemical solution deposition and some vacuum deposition methods. The chemical solution deposition technology is very beneficial to reduce pro...

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Problems solved by technology

Such a traditional thermal decomposition process leads to too long heat treatment time, seriously reducing the production rate of high-temperature superconducting films, and this also increases the requirements for heat treatment equipment in the industrial production of second-generation high-temperature superconducting wires, so This problem has become one of the most important factors restricting the cost reduction of wires

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