PURPOSE: To prevent deterioration in characteristic by depositing a first layer composed of Ln2BaCuOx, a second layer composed of a superconductive layer LnBa2Cu3O7-x, and a third layer composed of a mixture of BaCuO3, CuO, and LnBa2Cu3O7-x.
CONSTITUTION: Y is adopted as Ln. A laminated superconductive film is formed by plasma flame coating, and after an hour of preliminary heating at 900°C in oxygen, it is kept at 980°C for 5 minutes, for a third layer 4 composed of a mixture of BaCuO2, CuO, and YBa2Cu3O7-x to be flame coated. After the slow cooling, the layer 4 is completely flame coated and its surface is covered up. Elemental analysis performed for the laminated superconductor shows that the Ni diffusion in a substrate 1 is stopped in a first layer 2 of Y2BaCuOx, and does not reach a second layer 3 composed of YB2Cu3O7-x. After having been left in an atmosphere of the humidity of 90%, and at the temperature of 80% for 5 months, superconductive characteristic of the film is not deteriorated at all. Ni is used as the substrate 1 as well as the other element such as Co and Cu.
SHINPO YUKIO
ONO MORIAKI
KABASAWA MAKOTO
KOSUGE SHIGECHIKA
SUZUKI TERUO
NIPPON KOKAN KK