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Technique development of Bi-2212/2223 superconductor thick film manufacturing by plasma spraying and heat treatment

Bi₂Sr₂CaCu₂O x (Bi-2212) and Bi₂Sr₂Ca₂Cu₃O y (Bi-2223) high-T c superconductor(HTS) coating have been prepared by plasma spraying and heaat treatment. The Bi-2212 HTS coating layer is synthesized through the peritectic reaction between Sr-Ca-Cu oxide coating layer and Bi-Cu oxide coating layer, and Bi₂Sr₂CaCu₂O y (Bi-2212) superconducting phase grow by partial melting process. The superconducting characteristic depends strongly on the conditions of the partial melting process. The Bi-2212 HTS layer consists of the whiskers grown in the diffusion direction. Above the 2212 layer, Bi-2223 phase and secondary phase was observed. The secondary phase is distributed uniformly over the whole surface. This is caused to the microcrack on the coatings surface. Despite everything, the film shows superconducting with an onset T c of about 115K. There are two changes steps. One changes (1step) at 115K is due to the diamagnetism of the Bi-2223 phase and the other changes (2step) at 78K is due to the diamagnetism of the Bi-2212 phase.