Patent ID: 6372054
Filing Date: 2002-04-16
Classification: H01L,Y10S

Abstract:
A process for producing an ultrafine multifilamentary super conductive Nb3(Al,Ge) wire comprising:a. preparing a composite core material comprising an Alâ€”(2-30)at. % Ge alloy, where at. % represents atomic percent of 1 &mgr;m or less in thickness, uniformly incorporated into a Nb matrix at a volume ratio in the range of 1:2.5 to 1:3.5 and forming a composite therewith; b. fabricating a composite wire having an ultrafine multifilamentary structure by embedding a plurality of the resulting composite core materials in a cylindrical matrix material containing Nb; c. forming an A15-phase filament having a lower order of crystallinity inside the composite wire having the ultrafine multifilamentary structure than the order of such crystallinity in the resulting product of this process, by a rapid heating and quenching treatment comprising rapidly heating the composite wire having the ultrafine multifilamentary structure to a temperature of 1,700Â° C. or higher in 2 seconds, followed by continuously introducing it into a molten metal; d. coating the composite wire having the ultrafine multifilamentary structure in the state above with copper (Cu) which functions as a superconductivity stabilizing material; and e. applying a post heat treatment in the temperature range of from 650 to 900Â° C. to the resulting product to increase the order of crystallinity of the Nb3(Al,Ge) of the A15 compound.