Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – Process of making wire – tape – cable – coil – or fiber
Patent
1995-06-06
1999-08-24
Gorski, Joseph M.
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
Process of making wire, tape, cable, coil, or fiber
29599, 505433, 505501, H01L 3924
Patent
active
059424664
ABSTRACT:
A novel process of the production and processing of high quality, high T.sub.c (Bi,Pb)SCCO superconductors starts with fabrication of a precursor article including selected intermediate phases with desired chemical and structural properties. The precursor fabrication includes introducing the reacted mixture having a dominant amount of the tetragonal BSCCO phase into a metal sheath, and sealing the reacted mixture within said sheath, heating the mixture at a second selected processing temperature in an inert atmosphere with a second selected oxygen partial pressure for a second selected time period, the second processing temperature and the second oxygen partial pressure being cooperatively selected to form a dominant amount of an orthorhombic BSCCO phase in the reacted mixture. The sealed sheath is deformed to form an elongated precursor article of a desired texture; and thereafter heated at a third selected processing temperature in an inert atmosphere with a third selected oxygen partial pressure for a third selected time period. The third processing temperature and third oxygen partial pressure are cooperatively selected to convert at least a portion of the orthorhombic BSCCO phase to the final superconducting BSCCO material.
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Balachandran et al., "Reduced-Pressure Calcination of Bismuth-Based Superconductors" Presented at a Poster Session at the Materials Research Society Meeting, Boston, MA (Dec. 3, 1991).
Zhengping et al., "BiPbSrCaCuO Superconductor Prepared by a Three-Step Reaction Process" Supercond. Sci. Technol., 5, 240-246 (1992).
Idemoto et al., "Oxygen Nonstoichiometery of 2223 Phase Bi-Pb-Sr-Ca-Cu-O System Superconducting Oxide" Physica C, 181, 171-178 (1991).
Carter William L.
Li Qi
Otto Alexander
Podtburg Eric R.
Riley, Jr. Gilbert N.
American Superconductor Corporation
Gorski Joseph M.
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