| 摘要 |
PURPOSE:To continuously manufacture an oxide superconductive wire rod with fully removed cavities and extremely high critical current density by having a sintered wire rod with superconductive composition of a Y-Ba-Cu-O group oxide preheated at 800 deg.C or more under a depressurized atmosphere before heated on a local basis to form a melted portion into further solidation and then anneal the same in an oxygen atmosphere. CONSTITUTION:A sintered raw material rod 1 with superconductive composition of a Y-Ba-Cu-O group is preheated at 800 deg.C or more in a depressurized atmosphere of 0.5 or less. This preheated raw wire rod 1 is locally heated at a temperature melted point or more under the depressurized atmosphere to form a melted portion 3, which is solidated under the depressurized atmosphere to obtain a wire rod 1. Then the wire rod 1 is heated at 500 deg.C or more in an oxygen atmosphere and annealed. As a result, even if the viscosity of the melted portion is raised to enough value or more to hold the melted portion between the sintered raw wire rod and the solidated one, cavities in an oxide superconductive wire rod after melted and solidated can be decreased to permit stable manufacture of the oxide superconductive wire rod of high critical current density. |
