ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Using a "powder-in-tube'' process long lengths of high Tc prototype tape have been fabricated with high critical currents at liquid-nitrogen temperature and excellent high field properties at liquid-helium temperature. A Pb-doped bismuth-based 2223 powder was initially prepared then packed into silver tubes. Using a combination of cold work and heat treatment, a high degree of texture and good compaction with uniform properties was achieved. Current densities exceeding 10 000 A/cm2 at 77 K and 50 000 A/cm2 at 4.2 K in zero field were measured. At the 4.2 K temperature, the material still carried approximately 14 000 A/cm2 at 8 T. Tests on spirally wound and reacted coils, 52 cm long, have also demonstrated high current carrying capability. Effects of process variations and observed microstructure on superconducting properties are described.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.105328
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