Other

Hidezumi Moriai

Akihiko Takahashi

Hitoshi Yasuda

Genzo Iwaki

Kenichi Kikuchi

Noriyuki Tatsumi

Fumikazu Hosono

A tube made of oxygen free copper is filled with a plurality of copper matrix Nb&mdash;Ti superconducting lead wires to obtain a composite billet. The resulting billet is subjected to hydrostatic pressure extrusion. Further, ageing heat treatment and wire drawing process are repeated for the composite material three times to prepare a Cu/Nb&mdash;Ti superconducting single wire. Then, the resulting Cu/Nb&mdash;Ti superconducting single wires are stranded each other to produce a superconducting strand. The superconducting strand is coated with an aluminum alloy to which either a content of 20 to 100 ppm of Cu and Mg or Mg, or a content of 10 to 120 ppm of Si and Cu is added by means of hot extrusion, the strand thus extruded is reduced by 0 to 20% in accordance with cold working to produce an aluminum stabilized superconductor. As a result, such aluminum stabilized superconductor having high mechanical strength as well as good thermal and electrical stability is provided while achieving light weight and downsizing thereof.

Growing community of inventors

Ibaraki, Japan

Hidezumi Moriai