Method for preparing NiO/SmBiO3 composite buffer layer thin film of high-temperature super-conduction coating conductor on biaxially-textured NiW alloy substrate

Abstract

The invention discloses a method for preparing a NiO / SmBiO3 composite buffer layer thin film of a high-temperature super-conduction coating conductor on a biaxially-textured NiW alloy substrate. A preparation method of a composite buffer layer comprises the following steps of: a, surface corrosion modification of a NiW alloy (200) substrate; b, oxidation heat treatment of a NiO buffer layer; c, preparation of a SmBiO3 buffer layer colloid; d, coating of a SmBiO3 buffer layer; and e, sintering and phase forming of the SmBiO3 buffer layer. According to the method, the NiO buffer layer is prepared by using an auto-oxidation extension preparation method which is low in manufacturing cost and easy in process, a high-quality NiO (200) buffer layer thin film is easy to manufacture, thickness is easy to control, and an effect of a coating conductor buffer layer can be effectively achieved. The SmBiO3 buffer layer which grows on the NiO buffer layer is prepared in air by using a chemical solution deposition method in which nitrate serves as a precursor, and the method is low in cost and applicable to large-scale deposition. A preparation process of the composite buffer layer, particularly the SmBiO3 buffer layer, breaks shackles of other foreign coating conductor composite buffer layer preparation processes and plays a positive promotion role in research and application process of the second-generation high-temperature super-conduction coating conductor of China.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconducting material preparation, and in particular relates to a preparation technology of a high-temperature superconducting coated conductor composite buffer layer film. Background technique [0002] Take YBa 2 Cu 3 o 7-X The second-generation high-temperature superconducting coated conductor represented by (YBCO) has a higher critical current density and better superconducting performance in a magnetic field than the first-generation BSCCO-based superconducting tape. Motors and superconducting transformers will have great application prospects. Developed countries will vigorously promote the research and practical application of second-generation high-temperature superconductors based on their own technological innovation and long-term interests in electric energy. The international competition is becoming more and more fierce. [0003] Since YBCO is a hard and brittle oxide, it...

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Problems solved by technology

[0005] At present, the structure of the traditional coated conductor is CeO2 / YSZ / CeO2 / Ni-based alloy, CeO2 / YSZ / Y2O3 / Ni-based alloy, and CeO2 / La 2 Zr 2 o 7 / Ni-based alloy, CeO2 / Ga 2 Zr 2 o 7 / Ni-based alloys. Most of their buffer layers are prepared by physical methods, which makes the preparation of the buffer layer complex, costly, and unsuitable for large-scale deposition.

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