Method for preparing high-temperature superconducting coating conductor LaSrMnO3 buffering layer film

Abstract

The invention discloses a method for preparing a high-temperature superconducting coating conductor La0.7Sr0.3MnO3 buffering layer film, and belongs to the technical field of high-temperature superconducting materials preparation. The film prepared by the method is smooth and compact, and is favorable in texture, and triplex functions of La0.7Sr0.3MnO3 as a conducting buffering layer film, namely isolation, extension and electric current transmission, can be adequately exerted. The method comprises the following steps: dissolving analytically pure lanthanum oxide (La2O3) in acetic acid (the mol ratio of the acetic acid to cations being 10: 1) in a cation ratio of La: Sr: Mn=0.7: 0.3: 1; after the analytically pure lanthanum oxide is completely dissolved, putting the obtained solution in an infrared drying box, and after the solution is baked into a white solid, taking out the white solid; mixing and dissolving strontium acetate and manganese acetate with the prepared white solid (namely lanthanum acetate) in propionic acid in the cation ratio of La: Sr: Mn=0.7: 0.3: 1 to form an anhydrous solution; adding polyvinyl butyral (PVB) in the anhydrous solution to prepare into a colloid with good film forming property; and coating the colloid on a substrate, drying the coated substrate, and then, putting the dried substrate in a sintering furnace to be sintered to form a phase, so as to obtain a lanthanum-strontium-manganese oxide La0.7Sr0.3MnO3 high-temperature superconducting coating conductor buffering layer. The cost of the method is low; the manufacturing process is simple; the operation is easy to control; and the environment is not polluted.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-temperature superconducting materials, in particular to a high-temperature superconducting coating conductor La 0.7 Sr 0.3 MnO 3 Fabrication technology of buffer layer film. Background technique [0002] The second-generation high-temperature superconducting tape, that is, the rare earth barium copper oxide ReBCO coated conductor, has broad application prospects in power systems due to its excellent intrinsic electromagnetic properties, especially its excellent current-carrying capacity under high magnetic field. Developed countries have vigorously promoted the research and practical application of second-generation high-temperature superconductors based on their own technological innovation and long-term interests in electric energy, and international competition has become increasingly fierce. [0003] The ReBCO-coated conductor based on Ni alloy has a typical sandwich structure, ...

AI Technical Summary

Problems solved by technology

In the practical superconducting thin film, when the superconducting current has weak grain connections, defects or cracks in the local superconducting layer, the local current may exceed the superconducting critical current Ic value, thereby causing the superconducting layer to quench

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