Process for making filamentary superconductors using tin-magnesi

Details Process for making filamentary superconductors using tin-magnesi Process for making filamentary superconductors using tin-magnesi

1989-09-25

1990-11-27

Roy, Upendra

Stock material or miscellaneous articles

Static electricity metal bleed-off metallic stock

Special properties

29599, 148 115F, 148 115Q, 148 127B, 148133, 420901, H01L 3924, H01L 3900

Patent

active

049735276

ABSTRACT:
A method is disclosed for fabricating a wire from niobium tin produced in situ in a filamentous structure capable of achieving the superconducting state which comprises overlapping a tin alloy core comprised of tin-magnesium eutectic alloy with alternating layers of copper and foraminous layers followed by drawing the thus-formed niobium filaments into wire, then heating the wire at sufficiently high temperature to cause the eutectic alloy to homogeneously diffuse through the length of the copper wire and rods to react with the Nb, forming the A-15 crystal structure of Nb.sub.3 Sn, characterized by refined grain structure therein and improved current carrying capability.

REFERENCES:
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patent: 4411712 (1983-10-01), Marancik
patent: 4414428 (1983-11-01), McDonald
patent: 4419145 (1983-12-01), Tachikawa et al.
patent: 4447946 (1984-05-01), Marancik
patent: 4505762 (1985-03-01), Fukutsuka et al.
patent: 4531982 (1985-07-01), Dubots
patent: 4767470 (1988-08-01), Tachikawa et al.
Togano et al, Journ. Less-Common Metals 68 (1979) 15.
Wu et al, IEEE Trans-Magnetics, vol. 19 (1983) 1437.

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