Method of fabricating superconducting ceramic pipe

Details Method of fabricating superconducting ceramic pipe Method of fabricating superconducting ceramic pipe

1991-11-26

1993-11-30

Silbaugh, Jan H.

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

264304, 264332, 505739, H01L 3912

Patent

active

052665577

ABSTRACT:
A method of fabricating a superconducting ceramic pipe including the steps of: melting a ceramic powder having a predetermined composition to form a melt; filling a supporting tube with the melt by a suction caused by a vacuum pressure; partially solidifying an outer part of the melt near the tube to form a shell (i.e., a ceramic pipe); discharging an inner unsolidified part at the center of the tube from the tube by gravity, to form a solidified ceramic pipe on the inside surface of the tube; and heat treating the ceramic pipe to convert it into a superconducting pipe. When a supporting tube with a bottom plate is used, the melt is poured into the tube, and the tube is turned over to remove an unsolidified melt, whereby a superconducting ceramic pipe with a bottom is fabricated.

REFERENCES:
patent: 2862845 (1958-12-01), Szegvari
patent: 3016597 (1962-01-01), Denes
patent: 5013500 (1991-05-01), Hamanaka et al.
patent: 5047391 (1991-09-01), Bock et al.
patent: 5070071 (1991-12-01), Geballe et al.
patent: 5104850 (1992-04-01), Provenzano et al.
"Superconducting Glass-Ceramic Rods in BiCaSrCu.sub.2 O.sub.x Prepared by Crystallization under a Temperature Gradient", Abe et al, Appl. Phys. Lett. 53 (14), Oct. 3, 1988, pp. 1341-1342.

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