Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1989-08-22
1992-09-08
Lowe, James
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
264 65, 264 66, 264239, 264240, 505739, 505740, H01L 3912
Patent
active
051458292
ABSTRACT:
A compacted and highly oriented microstructure of the bulk-shaped Bi-Sr-Ca-Cu-O system oxide superconductor is obtained by the intermediate pressing method of the present invention. The growth rate of the high critical temperature phase in the bulk of Pb-doped Bi-Sr-Ca-Cu-O system oxide superconductor is also much improved and the sintering duration for obtaining a single phase having a high critical temperature is shorteneed by this method. Additionally, a higher critcal current density of Bi-Sr-Ca-Cu-O system oxide superconductor is obtained by the working under pressure process after cooling between a first and a second sintering step. Furthermore, the magnetic field dependence of the critical current density of Bi-Sr-Ca-Cu-O system oxide superconductor is also improved by the method of the present invention. The thus intermediate pressing process between the first and second sintering step of the present invention may be applied so easily as to facilitate the manufacture of tapes, wires, discs or the like of the Bi-Sr-Ca-Cu-O system oxide superconductor.
REFERENCES:
patent: 4906609 (1990-03-01), Yamauchi et al.
Yamada et al. "Pb-Introduction to the High-T.sub.c Superconductor Bi-Sr-Ca-Cu-O" Jap. Journ. App. Phys. Jun. 1988.
Asano et al. "Preparation of Highly Oriented Microstructure in the (Bi, Pb)-SR-CA-CU-O Sintered Oxide Superconductor" Jap Jour App Phys (Sep., '88).
Tanaka et al. "Improvements in the Current Carrying Capacity in High-T.sub.c BiSRCACuO Superconductors" Jap Journ App Phys (Sep. '88).
Mimura et al. "Improvement of the Critical Current Density in the Silver Sheathed Bi-PB-SR-CA-CU-O Superconducting Tape," App Phys Lett (Apr. 1989).
Sadakata et al, "Fabrication and Superconducting Properties of High T.sub.c Oxide Wire", Matls. Research Soc. Symposium Proceedings (Dec. 1987).
Takano et al., "High T.sub.c Phase Promoted and Stabilized in the Bi-PB-SR-Ca-Cu-O System," Jap Journ of App Phys (Jun. 1988).
Sherwood et al. "Superconducting Properties of YBA.sub.2 Cu.sub.3 O.sub.7-8 Doped with Various Metals and Oxides," Matls. Research Soc. Symposium vol. 99 (Dec. 1987).
Asano Toshihisa
Fukutomi Masao
Maeda Hiroshi
Tanaka Yoshiaki
Fiorilla Christopher A.
Lowe James
National Research Institute for Metals
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