Development of a scalable Tl-1223 tape process -- thallination of powder precursor coatings
- GE Corporate Research & Development, Schenectady, NY (United States)
- National Renewable Energy Lab., Golden, CO (United States); and others
Superconducting tapes, 10-20 cm long, of TlBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 9} on Ag have been fabricated by deposition of a thallium-free powder precursor on Ag followed by reaction with a thallium oxide vapor species. Single-sided and two-sided coatings are prepared using a spray-deposition or dip-coating, respectively. The coated tapes are annealed and then mechanically processed to densify the precursor. Continuous thallination of precursor tapes is performed by pulling the coated tape through a two-zone furnace at constant velocity and gave similar results as batch processing. Critical currents of the order 10-20 A at 77K, zero field for a 5 mm wide tape are observed. Properties as a function of magnetic field indicate reduced flux creep compared to the more anisotropic bismuth cuprate superconductors and make thallium 1223 an attractive material for conductor applications at high temperatures.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 483598
- Report Number(s):
- CONF-950722-; ISSN 0065-2482; TRN: 97:001732-0049
- Journal Information:
- Advances in Cryogenic Engineering, Vol. 42B; Conference: CEC/ICMC `95: cryogenic engineering conference and international cryogenic materials conference, Columbus, OH (United States), 17-21 Jul 1995; Other Information: PBD: 1997
- Country of Publication:
- United States
- Language:
- English
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