Method for producing Al-stabilized Nb-Ti superconductor

摘要

PURPOSE:To lessen the a. c. loss by closely joining gaps among a Cu-Ni/Cu/Nb- Ti superconductive core wire and a plurality of Al stabilizing core wires coated with a Cu-Ni alloy and having a fan-like cross section by soldering. CONSTITUTION:An extremely thin Cu-Ni/Cu/Nb-Ti-based multicore superconductive core wire 5 set in the center and aluminum stabilizing wires produced by coating aluminum with a Cu-Ni alloy 1 and arranged circularily in the outer circumference of the superconductive core wire 5 are united by drawing. The stabilizing wires are formed into a fan-like cross section by the drawing process and the diameter of the conductor is made to be 1.85mm. The surface of the superconductive core wire 5 and the stabilizing wires 6 is coated with a solder and the coating closely adheres to the surface by the drawing process. In the coating with the solder, the superconductive wire 5 and the stabilizing wires 6 are immersed in a solder bath after the drawing process to melt the solder and fill the gaps among the wires with the solder. Consequently, the adhesion strength of the solder coating is improved and the united superconductive conductor can have improved mechanical strength and as a result, the current density of the superconductive wire can be improved.