Metal working – Method of mechanical manufacture – Electrical device making
Patent
1976-02-18
1977-11-01
Keenan, Michael J.
Metal working
Method of mechanical manufacture
Electrical device making
29419R, H01V 1100
Patent
active
040558878
ABSTRACT:
A method of producing a stabilized electrical superconductor wherein a longitudinally extending slug is provided, the slug including a matrix such as bronze within which are embedded a multiplicity of wires or rods of a material such as niobium into which the tin in the bronze is diffused to convert the niobium into a superconductor. The matrix is surrounded by a ring of wires or rods of a material such as copper having a high electrical conductivity characteristic, forming an electrically parallel connection with the superconductors which provides a bridge of good electrical conductivity in the event the superconductivity of the superconductor is lost for any reason and each of these latter wires or rods is surrounded by a high resistance layer such as a copper-nickel alloy, which, in turn, is surrounded by a diffusion inhibiting layer such as tantalum to prevent diffusion of the tin from the bronze matrix into the copper wires or rods which would otherwise reduce their electrical conductivity.
The slug is then drawn to convert the various wire or rod components within it into filamentary form, and diffusion of the tin into the niobium to convert the latter into a superconductor is effected by annealing.
REFERENCES:
patent: 3618205 (1971-11-01), Barber et al.
patent: 3643001 (1972-02-01), Schaetti
patent: 3743986 (1973-07-01), McInturff et al.
patent: 3930903 (1976-01-01), Randall et al.
Harwell Industrial Services, "Niobium-Tin Superconducting Wires," 1973, pp. 1,2 and attachment pp. 1-4.
BBC Brown Boveri & Company Limited
Keenan Michael J.
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