| 摘要 |
It is an object to provide a process for producing a superconducting wire without defects, such as deterioration of characteristics and deformation, in which a superconducting wire having a length of 1 km or more and a high critical electric current density is easily subjected to heat treatment. The first invention comprises a step of inserting a metallic sheath wire (1), which is formed by filling a superconducting material in a metallic sheath, into a metallic tube (2) having an inner diameter larger than an outer diameter or a width of the metallic sheath wire; and a step of conducting heat treatment under such a condition in that the superconducting wire is wound to overlap a cylindrical fixture to prevent contact with each other while controlling the interior of the metallic tube. <??>The second invention uses a ceramic board (9) on the heat treatment of a pancake (15) formed by winding the metallic sheath wire on a core (10). Since the binder of the ceramic board (9) disappears, and the powder or fibers are in a freely movable state, the ceramic board does not restrict shrinkage and expansion of the wire, so as not to cause deformation of the wire. Thus, a long length wire having a length of 1 km or more can be subjected to heat treatment. The characteristics can be improved by conducting the heat treatment under the prescribed conditions of oxygen partial pressure and temperature. <IMAGE> <IMAGE> |
