Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1992-04-29
1994-09-06
Silbaugh, Jan H.
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
264 63, 264 65, 264 66, 264211, 26421111, 26421112, 26421113, 264235, 505739, 505740, 505748, 505705, H01L 3912
Patent
active
053448154
ABSTRACT:
A method for producing a superconducting copper oxide based helical resonator coil exhibiting improved quality factor, Q. A copper oxide based superconductor powder is mixed with a binder melt at about 45-65% solids by volume. The binder is an RCOOR' ester wax with R and R' each a long chain hydrocarbon group of at least 6 carbons. The ester wax has a melting point of about 40.degree.-100.degree. C. and a viscosity of about 94-2000 centipoise at its melting point. The binder/powder mixture is extruded and wrapped around a mandrel to form a helical coil. The coil is embedded in a setter powder and heated in an oxidizing atmosphere at up to about 2.degree. C./min to about 450.degree.-650.degree. C., and held for a time sufficient to remove the binder. The coil is then heated in the oxidizing atmosphere at up to about 3.degree. C./min to at least about 920.degree. C., and held at about 920.degree.-990.degree. C. for a time sufficient to achieve a density of at least about 93% of theoretical density. The densified coil is cooled in the oxidizing atmosphere at below about 2.degree. C./min to at or below about 550.degree. C., and annealed at about 450-550.degree. C. in flowing oxygen for a time sufficient to convert the crystal structure of the coil to at least 50 v/o high T.sub.c phase superconducting perovskite crystal. The geometry of the extruded, wrapped helical coil is selected to produce, after subsequent densification, a helical resonator coil about 3-17 mm in inner diameter, of a total length n .lambda./2, wherein n is an integer and .lambda. is the operating wavelength of the helical resonator coil.
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Butler Scott
O'Connor Margaret
Su Sophia R.
Fiorilla Christopher A.
GTE Laboratories Incorporated
Monks Lawrence E.
Silbaugh Jan H.
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