Patent ID: 6508889
Filing Date: 2003-01-21
Classification: B21C,B32B,C22C,C22F,H01L,Y10S,Y10T

Abstract:
A process for the production of an Nb3Al extra-fine multifilamentary superconducting wire, the process comprising the steps of: applying a first rapid heating and quenching treatment to an Nb/Al composite wire having an atomic ratio of Al to Nb from 1:2.5 to 1:3.5 and having extra-fine multifilamentary structure to form a BCC alloy phase comprising Nb with Al supersaturatedly dissolved therein wherein the first treatment comprises heating the composite wire up to a temperature not lower than 1900Â° C. within two seconds and then introducing it into a molten metal at a temperature not higher than 400Â° C. to rapidly quench it; applying a second rapid heating and quenching treatment to form an A15 phase-Nb3Al compound having a low degree of crystalline order but having an approximately stoichiometric composition wherein the second treatment comprises heating the wire up to a temperature not lower than 1500Â° C. within two seconds and then introducing it into a molten metal at a temperature not higher than 400Â° C.; and applying, after the second rapid heating and quenching treatment, an additional heat treatment at 600-850Â° C. to the composite wire to improve the degree of crystalline order of the A15-Nb3Al compound.