Superconductor technology: apparatus – material – process – High temperature – per se – Bismuth containing
Reexamination Certificate
2005-05-17
2005-05-17
Kopec, Mark (Department: 1751)
Superconductor technology: apparatus, material, process
High temperature , per se
Bismuth containing
C505S450000, C505S501000, C505S124000
Reexamination Certificate
active
06894006
ABSTRACT:
A method for reducing the concentration of non-superconducting phases during the heat treatment of Pb doped Ag/Bi-2223 composites having Bi-2223 and Bi-2212 superconducting phases is disclosed. A Pb doped Ag/Bi-2223 composite having Bi-2223 and Bi-2212 superconducting phases is heated in an atmosphere having an oxygen partial pressure not less than about 0.04 atmospheres and the temperature is maintained at the lower of a non-superconducting phase take-off temperature and the Bi-2223 superconducting phase grain growth take-off temperature. The oxygen partial pressure is varied and the temperature is varied between about 815° C. and about 835° C. to produce not less than 80 percent conversion to Pb doped Bi-2223 superconducting phase and not greater than about 20 volume percent non-superconducting phases. The oxygen partial pressure is preferably varied between about 0.04 and about 0.21 atmospheres. A product by the method is disclosed.
REFERENCES:
patent: 5376623 (1994-12-01), Tsai et al.
patent: 5468566 (1995-11-01), Dorris et al.
patent: 5635456 (1997-06-01), Riley et al.
patent: 5798318 (1998-08-01), Li et al.
Maroni Victor A.
Merchant Nazarali N.
Parrella Ronald D.
American Superconductor Corp.
Emrich & Dithmar, LLC.
Kopec Mark
University of Chicago
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