High-temperature porous-ceramic superconductors

Details High-temperature porous-ceramic superconductors High-temperature porous-ceramic superconductors

1989-01-26

1991-03-12

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Pore-forming

501152, 501126, 505780, 505739, H01D 1200, H01L 3912

Patent

active

049993224

ABSTRACT:
A method for fabricating a high-temperature ceramic superconductor having a Y-Ba-Cu-O or other copper-oxide composition of comparable properties so as to render the ceramic porous to define interlaced diffusion channels throughout the entire body of the ceramic. As a consequence, oxygen, an essential component thereof, will in the course of firing the ceramic, diffuse throughout the interior of the body and thereby interact and become integrated with the crystal structure of the ceramic to form a superconductor having superior properties. The resultant porous ceramic body may be used as a superconductive device, or it may be ground into particles and dispersed as a filler in a binder acting as a plastic agent that can be extruded, molded, or otherwise shaped to create a Meisner-effect shield, a cylindrical superconductive bearing or other superconductive structure.

REFERENCES:
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patent: 4540677 (1985-09-01), Enomoto et al.
Eatough et al., "Orthochrombic-Tetrapanel Phase Transition in High-Temperature Superconductor 9Ba.sub.2 Cu.sub.3 O.sub.7 " Appl. Phys. Lett. 51(5), 3 Aug. 1987.
Cheng et al., "The Effect of Porosity on the Superconducting Properties of 9Ba.sub.2 Cu.sub.3 O.sub.x Ceramic," Supercond. Science and Technology, 1(3), pp. 113-117, 27 Jun. 1988.
High Tc Superconductivity Report, Materials and Processing Report Dec. 1987.
McAndrew et al., "Reaction of Organic Materials with 4Ba.sub.2 Cu.sub.3 O.sub.x ", American Vacuum Society Series 3, Nov. 6, 1987.
Ovshinsky et al., Superconductivity at 155k, Phy. Review Lett., vol. 58, #24, (15 Jun. 1987).
Dagani, Superconductivity: A Revolution in Electricity is Taking Shape, Chem and Eng News, (11 May 1987).

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