Method for producing superconductive wires

Details Method for producing superconductive wires Method for producing superconductive wires

1986-09-08

1987-08-18

Lechert, Jr., Stephen J.

Electricity: conductors and insulators

Conduits, cables or conductors

Conductor structure

174126CP, 174128S, 29599, 419 23, 419 38, 419 66, 148 115Q, 148 115P, 148 115F, 148 115C, H01B 500

Patent

active

046878831

ABSTRACT:
The present invention relates to a method for producing multifilament superconductive wires of Nb.sub.3 Sn or V.sub.3 Ga filaments embedded in a Cu or Cu alloy matrix, with the wires containing metal additive elements from the group including Ti, Zr, Hf, V, Nb, Ta, Fe, Co, Ni in the filaments and/or in the matrix. The superconductive characteristics of the wires are predetermined for medium magnetic fields (below 12 T) as well as for high magnetic fields (12 T and above). The percentage of the additive (or additives) can be set to a predetermined value and thus the superconductive properties can be set as desired. This is accomplished by mixing metal additives in powder form with a powder of niobium or a niobium alloy, or of vanadium or a vanadium alloy, in a defined grain size and in a defined quantity. The resulting powder mixture is compacted in a container of copper or a copper alloy, the compacted container is shaped into a wire and, upon removal of the container layer, is processed further into wires. Depending on the desired superconductive properties, the final reaction heat treatment of the wires is performed at a selected temperature in a range from 500.degree. C. to 1000.degree. C. and at a selected heat treatment duration in a range from 48 to 300 hours.

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