Margaret Ann O'Connor

US Patent:

53448154, Sep 6, 1994

Filed:

Apr 29, 1992

Appl. No.:

7/875905

Inventors:

Sophia R. Su - Weston MA
Margaret O'Connor - Worcester MA
Scott Butler - N. Oxford MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

H01L 3912

US Classification:

505 1

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.