OXIDE SUPERCONDUCTIVE COIL AND MANUFACTURE THEREOF

摘要

PROBLEM TO BE SOLVED: To prevent an oxide superconductive coil manufactured through a W & R method from being deformed by its own weight in a thermal treatment by a method wherein a heat resistant-alloy where an oxide film is formed is used as an insulating material for the oxide superconductive coil between the turns or the coils. SOLUTION: A Bi-2212 oxide superconductive wire 1 and a hastelloy X tape 2 provided with an insulating film formed on its surface are wound together like a pancake around an Ag ring 3 or a wound core applying a tension of 10kgf/mm<2> to the wire 1 and a tension of 20kgf/mm<2> to the tape 2 respectively for the manufacture of a pancake coil. Then, the manufactured pancake coil is subjected to a partial fusion thermal treatment in an atmosphere of pure oxygen and then to an annealing treatment in an oxygen atmosphere of reduced pressure and turned into a Bi-2212 superconductive coil. By this setup, a Bi-2212 superconductive coil can be prevented from being deformed by an electromagnetic force under a strong magnetic field or in a thermal treatment and deteriorating in critical current density characteristics due to reaction or the like.