PURPOSE: To obtain an Nb3Sn superconductive wire for alternating current which has a very fine multicore structure with an excellent superconductive characteristic.
CONSTITUTION: A Cu covered Sn rod is housed in an Nb pipe, and after providing a Cu-0.5wt.% Mn alloy pipe and a Cu-30wt.% Ni alloy pipe in order at the outer side of the Nb pipe, a wire drawing process is applied to manufacture a single wire having a hexagonal cross-section. After a specific number of single wires are filled in a Cu-10wt.% Ni alloy pipe, a hydrostatic pressure extruding and a wire drawing process are applied to manufacture the primary multiwire having a hexagonal section. After making the primary multiwire into a double A stack structure by the same method, a hydrostatic pressure extruding and a wire drawing process are applied to manufacture the secondary maltiwire. The secondary maltiwire having the filamant diameter 0.5μm demonstrates a critical current density of 10000A/mm2 at 0.5T.
AOKI NOBUO
UCHIYAMA TAKESHI
MIYAKE SEIICHI
KUMANO TOMOYUKI
NOGUCHI ICHIRO
YAMASAKI TAKAYUKI
SAKAGAMI YOSHIHIRO
Next Patent: MANUFACTURE OF NB3SN SUPERCONDUCTIVE WIRE