| 摘要 |
A method for producing a superconductive element, in particular a multifilament wire, starting from a composite (1;4;7) comprising a bronze matrix (6;9;10) containing Cu and Sn, in which at least one elongated structure (5;8) containing Nb or Nb alloy, in particular NbTa, is embedded, whereby in a first step the composite (1;4;7) is extruded at a temperature between 300°C and 750°C, followed by cold or hot working and annealing steps in which the composite (1;4;7) is elongated in parallel to the elongated structure (5;8) and softened by temperature treatment, followed by a stacking step, in which a multitude of elongated composites (1;4;7) from the preceding cold or hot working steps is bundled, the steps of extruding, elongating, annealing and stacking being repeated one or more times, followed by a final elongating process, including intermediate annealing processes, in which the composite (1;4;7) is elongated to its final length, the superconductive phase being obtained by a heat treatment including a solid state diffusion reaction, is characterized in that at least part of the elongating steps and annealing steps is performed by isothermal hot rolling in a temperature region between 450°C and 750°C at or above recrystallization temperature of the bronze matrix (6;9;10). |
