Method of producing superconducting ceramic wire
AssigneeSumitomo Electric Industries, Ltd.
InventorsMasashi Onishi, Takashi Kohgo, Tetsuya Ohsugi, Gotaro Tanaka
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Abstract
A superconducting ceramic wire is prepared from a superconducting ceramic-forming oxide composition by melting, the composition and quenching the melt to form a dense glass, which is soften and wire-drawn in a furnace. The resulting wire is heat-treated to form crystals and made into a superconducting ceramic wire. The wire has a flexibility and remarkable superconductivity which can further be improved by applying pressure to be made more dense and repeating the heat-treatment.
Claims23
A method of producing a superconducting ceramic wire of a Bi-Sr-Ca-Cu-O system which comprises the steps:
- (a) homogeneously melting a mixture consisting essentially of oxygen-bearing Bi, Sr, Ca and Cu compounds capable of being converted into a superconducting ceramic and silver in an amount sufficient for accelerating the formation of superconductive crystal nuclei of said system and quenching the melt to form a glass,
- (b) wire-drawing the glass, and
- (c) conducting a heat-treatment of the drawn glass to effect recrystallization thereof.
A method of producing a superconducting ceramic wire of a (Bi plus Pb)-Sr-Ca-Cu-O system in which Pb is present in an atomic weight of up to 35% of (Bi plus Pb);
- which comprises the steps:
- (a) homogeneously melting a mixture consisting essentially of oxygen-bearing Bi, Sr, Ca, Cu and Pb compounds capable of being converted into a superconducting ceramic and silver in an amount sufficient for accelerating the formation of superconductive crystal nuclei of said system and quenching the melt to form a glass,
- (b) wire-drawing the glass, and
- (c) conducting a heat-treatment of the drawn glass to effect recrystallization thereof.
Dependencies are inferred from the claim text.