Development of a Scalable Tl-1223 Tape Process -- Thallination of Powder Precursor Coatings

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Abstract

Superconducting tapes, 10-20 cm long, of TiBa2Ca2Cu3O9 on Ag have been fabricated by deposition of a thallium-free powder presursor 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. Continuousthallination 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 andmake thallium 1223 an attractive material for conductor applications at high temperatures.
Original languageAmerican English
Pages (from-to)869-876
Number of pages8
JournalAdvances in Cryogenic Engineering
Volume42
StatePublished - 1996

NREL Publication Number

  • NREL/JA-520-24319

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