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Preparation of High-Tc Superconducting Thick Films by a Low-Pressure Plasma Spraying
Abstract Superconducting thick films of YBaCuO systems have been prepared by a low pressure plasma spraying technique. After the post-annealing in oxygen at 900~970°C, YBaCuO films showed zero resistance temperatures, Tc of ~90K. In order to improve the critical current density, Jc of the films, a melt-reaction method has been newly developed. A flux layer richer in Ba and Cu was coated on a YBa2Cu3Ox+Y2BaCuOx mixure layer by a low pressure plasma spraying, and then the double-layered film was annealed at 930–970°C, where the flux layer melted. The molten oxide acted as a flux and enhanced grain growth of YBa2Cu3Ox. The excess flux reacted with Y2BaCuOx and was fully converted to YBa2Cu3Ox. The grain growth of YBa2Cu3Ox and the reaction between the flux and Y2BaCuOx yielded a dense and uniform YBa2Cu3Ox layer, so that the Jc of the films were improved up to 2000A/cm2. This might be due to the dense structure which improves the coupling between the grains of the superconducting phase, and the grain growth which ruduces the grain boundary.
Preparation of High-Tc Superconducting Thick Films by a Low-Pressure Plasma Spraying
Abstract Superconducting thick films of YBaCuO systems have been prepared by a low pressure plasma spraying technique. After the post-annealing in oxygen at 900~970°C, YBaCuO films showed zero resistance temperatures, Tc of ~90K. In order to improve the critical current density, Jc of the films, a melt-reaction method has been newly developed. A flux layer richer in Ba and Cu was coated on a YBa2Cu3Ox+Y2BaCuOx mixure layer by a low pressure plasma spraying, and then the double-layered film was annealed at 930–970°C, where the flux layer melted. The molten oxide acted as a flux and enhanced grain growth of YBa2Cu3Ox. The excess flux reacted with Y2BaCuOx and was fully converted to YBa2Cu3Ox. The grain growth of YBa2Cu3Ox and the reaction between the flux and Y2BaCuOx yielded a dense and uniform YBa2Cu3Ox layer, so that the Jc of the films were improved up to 2000A/cm2. This might be due to the dense structure which improves the coupling between the grains of the superconducting phase, and the grain growth which ruduces the grain boundary.
Preparation of High-Tc Superconducting Thick Films by a Low-Pressure Plasma Spraying
Tachikawa, K. (author) / Shimbo, Y. (author) / Ono, M. (author) / Kabasawa, M. (author) / Kosuge, S. (author)
1990-01-01
6 pages
Article/Chapter (Book)
Electronic Resource
English
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