Alloy method of making a composite having superconducting capabi

Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k

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29599, 228158, H01L 3924

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active

050752863

ABSTRACT:
A method of making a composite having superconducting capability is characterized by the steps: (1) forming a mixture of particulate yttrium or rare earth, that is alloyable with Ba and Cu, with particulate Ba, Cu, and Ag, where Ag additive is present in an amount of from 2 weight % to 30 weight % of the mixture, where the Ag additive has a particle size from 0.01 micrometer to 5 micrometers, (2) melting the mixture, (3) forming on a support surface a 10% to 30% porous ribbon of alloy having an interior Ag network, (4) removing the ribbon, (5) placing the ribbon alloy on top of a metal sheet, (6) placing a metal sheet on top of the ribbon alloy, (7) sealing the ribbon alloy within the metal sheets to form a composite, (8) uni-directional rolling the composite to reduce its cross-section, and (9) annealing the composite at from 100.degree. C. to 900.degree. C. in the presence of a source of oxygen, to provide a ceramic ribbon having contacting Ag additive particles effective to carry electrical current from the ceramic ribbon to the metal sheets at temperatures greater than 100.degree. K.

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