溶射法による超伝導膜の作製

抄録

As an attempt to produce a thick superconductive film with a large area, an experimental study was made on the preparation of the film through laser post-treatment of thermal-sprayed oxide ceramic film. The ceramic powder of Bi-(Pb)-Sr-Ca-Cu-O system (2223-phase) was used as the raw material. The powder was sprayed onto a stainless steel substrate using conventional plasma spraying system and newly developed lower temperature hypersonic spraying system, followed by CO₂ laser beam irradiation with oxygen gas blow to modify the superconductive crystals of the film. The laser post-treatment can produce the superconductive crystals of 2212 and 2201 phases in the plasma sprayed film and 2223, 2212 and 2201 phases in the hypersonic sprayed film. The latter film has higher value in Tc(end) than the plasma sprayed film.