Electricity: conductors and insulators – Conduits – cables or conductors – Combined
Patent
1987-10-13
1989-01-10
Nimmo, Morris H.
Electricity: conductors and insulators
Conduits, cables or conductors
Combined
29599, 29869, 501 1, H01R 468
Patent
active
047975105
ABSTRACT:
A method and product for coupling the ends of a pair of superconducting cored wires are provided, the core of the wires consisting essentially of a substantially unitary structure of a sintered powered superconducting compound material confined within a tubular element of a metal having an electrical conductivity of at least about 20% of that for pure copper taken as unity which metal forms a clad around the core material. The method comprises providing a pair of superconducting cored wires with the cladding material removed from an end of each of the wires to be coupled together to expose a finite length of said core material. A coupling device comprised of a tubular segment of the same metal as the cladding material is used to join the wires together, the tubular segment having disposed therein a green pellet of the superconducting material. The pellet is positioned inwardly from both ends of the tubular segment to allow for entry of the exposed end of the superconducting cored wires. The tubular segment has an internal diameter corresponding substantially to the outside diameter of the cored wires sufficient to provide an interference fit following insertion into the coupling. The exposed ends of the superconducting cored wires to be joined are inserted into the open ends of the tubular coupling device with a rotational force sufficient to effect electrical contact between the ends of the coupled wires and the green pellet and the assembly then subjected to an elevated sintering temperature below the melting point of the clad metal sufficient to sinter the green pellet and effect diffusion bonding between the pellet and the superconducting core material of each of the coupled wires.
REFERENCES:
patent: 4126759 (1978-11-01), Brooks
patent: 4673774 (1987-06-01), Wake et al.
Jin, S; et al; High Tc Superconductors-Composite Wire Fabrication; Appl. Phys. Lett.; vol. 51, No. 3; Jul. 20, 1987.
Jin, S. et al; Fabrication of Dense Ba.sub.2 YCl.sub.3 O.sub.7-8 Superconductor Wire by Molten Oxide Processing; Appl. Phys. Lett. 51(12): Sep. 21, 1987; p. 943.
Yamada, Yutaka et al; Bulk and Wire Type Y-Ba-Cu Oxide Superconductor; Proc. I&M Int. Conf. on Low Temperature Physics, Kyoto, 1987; Japanese Journal of Applied Physics; vol. 26 (1987) Supplement 26-3., p. EK31.
AMAX, Inc.
Ciomek Michael A.
Kalil Eugene J.
Nimmo Morris H.
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