Acoustic plane wave preferential orientation of metal oxide supe

Details Acoustic plane wave preferential orientation of metal oxide supe Acoustic plane wave preferential orientation of metal oxide supe

1987-09-28

1991-09-03

Theisen, Mary Lynn

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

264 23, 264 24, 264 56, 264108, 505740, 505741, H01L 3912

Patent

active

050455281

ABSTRACT:
A polycrystalline metal oxide such as YBa.sub.2 Cu.sub.3 O.sub.7-X (where 0<X<0.5) exhibits superconducting properties and is capable of conducting very large current densities. By aligning the two-dimensional Cu-O layers which carry the current in the superconducting state in the a- and b-directions, i.e., within the basal plane, a high degree of crystalline axes alignment is provided between adjacent grains permitting the conduction of high current densities. With the superconducting metal oxide in the form of a ceramic slip which has not yet set, orientation of the crystal basal planes parallel with the direction of desired current flow is accomplished by an applied acoustic plane wave in the acoustic or ultrasonic frequency range (either progressive or standing) in applying a torque to each crystal particle. The ceramic slip is then set and fired by conventional methods to produce a conductor with preferentially oriented grains and substantially enhanced current carrying capacity.

REFERENCES:
patent: 2384215 (1945-09-01), Toulmin
patent: 3041670 (1962-07-01), Broderson
patent: 4762754 (1988-08-01), Nellis et al.
Takita et al., "Studies on Anisotropic Upper Critical Fields of HoBa.sub.2 Cu.sub.3 O.sub.7-8 and ErBa.sub.2 Cu.sub.3 O.sub.7-8 Using Preferentially Oriented Pellets", Jap. J. App. Phys., vol. 26, No. 9, Sep. 1987, pp. L1552-L1554.
Poeppel et al., "Fabrication of YBa.sub.2 Cu.sub.3 O.sub.7 Superconducting Ceramics", ACS Symposium Series 351, pp. 261-265, Aug. 30-Sep. 4, 1987.

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