Multifilament superconductor strand having an anti-diffusion bar

Details Multifilament superconductor strand having an anti-diffusion bar Multifilament superconductor strand having an anti-diffusion bar

1990-07-06

1992-04-14

Dean, R.

Stock material or miscellaneous articles

All metal or with adjacent metals

Foil or filament smaller than 6 mils

428614, 428662, 428930, 1741251, 505812, B21C 3700

Patent

active

051047454

ABSTRACT:
A multifilament superconducting strand for use at industrial frequencies and made from an initial billet comprising a superconducting core niobium-titanium alloy surrounded by an anti-diffusion barrier layer which is in turn surrounded by a copper based matrix material, with the strand being made from the billet by successive stages of extrusion, wire-drawing, and assembly, wherein the strand includes 5.times.10.sup.5 to 5.times.10.sup.6 filaments each constituted by the superconducting core reduced to a diameter in the range 50 nm to 150 nm, the filaments being separated from one another by a distance lying in the range 30 nm to 100 nm, which distance is occupied by the anti-diffusion layer and the matrix material. The matrix material contains in excess of 8% manganese when the anti-diffusion layer is made of niobium, or alternatively, the anti-diffusion layer may be of an iron-containing alloy with the matrix containing copper and nickel.

REFERENCES:
patent: 4791241 (1988-12-01), Ando et al.
patent: 4917965 (1990-04-01), Inoue et al.
Agatsuma, K., et al., IEEE Transactions on Magnetics, vol. Mag-19, No. 1, Jan. 1979.
IEEE Transactions on Magnetics, vol. 24, No. 2, Mar. 1988, New York, U.S., pp. 1033-1036; T. S. Kreilick et al.: "Influence of filament spacing and matrix material on the attainment of high quality uncoupled NbTi fine filaments."
IEEE Transactions on Magnetics, vol. 24, No. 2, Mar. 1988, New York, U.S. pp. 1145-1148; A. K. Ghosh et al.: "The effect of magnetic impurities and barriers on the magnetization and critical current of fine filament NbTi composites."

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