Method of fabricating multifilament superconductors.

摘要

An improved multifilament superconductor is fabricated by the method in which a tin rod or tin based alloy rod is clad with a copper based alloy tube, the thus obtained copper-clad rod is further clad with a niobium based alloy tube, and a copper material is applied as a stabilizer on an outer peripheral surface of the niobium based alloy tube to form a composite. This composite is then reduced and thermally treated at a temperature ranging from 640 to 770°C to thereby form an Nb3Sn superconductor composite with a filament tube therein. At least one of the copper based alloy tube and the niobium based alloy tube contains 0.1 - 5.0 at.% titanium, and in addition, the tin based alloy rod may contain 0.1 - 3.5 at % titanium.