Title :
Evaluation of YBa/sub 2/Cu/sub 3/O/sub 7-x/ bulk superconductors for high field magnet applications
Author :
Blohowiak, K.Y. ; Garrigus, D.F. ; Luhman, T.S. ; McCrary, K.E. ; Strasik, M. ; Aksay, I.A. ; Dogan, F. ; Hicks, W.B. ; Liu, J. ; Sarikaya, M.
Author_Institution :
Boeing Defense & Space Group, Seattle, WA, USA
fDate :
3/1/1993 12:00:00 AM
Abstract :
Processing of YBCO single crystals was carried out by solidification of semi-liquid YBCO composition using a seeding technique. Microstructural characterization of the pinning centers was investigated by transmission electron microscopy. Characterization of single crystals was carried out, relating grain size and shape to the corresponding flux profiles. Current densities were calculated based on measured trapped fields. Once circulating currents were established, flux pumping and quenching experiments were conducted. These large single crystals will be incorporated into electromagnetic forming devices for use in the military and commercial aircraft manufacturing and service industries.<>
Keywords :
barium compounds; critical current density (superconductivity); flux pinning; grain size; high-temperature superconductors; permanent magnets; solidification; transmission electron microscope examination of materials; yttrium compounds; TEM; YBCO single crystals; YBa/sub 2/Cu/sub 3/O/sub 7- delta /; bulk superconductors; circulating currents; current density; electromagnetic forming devices; flux profiles; flux pumping; grain size; high field magnet applications; high temperature superconductors; microstructure; pinning centers; quenching; seeding technique; semi-liquid YBCO composition; solidification; transmission electron microscopy; trapped fields; Crystal microstructure; Current density; Current measurement; Density measurement; Electromagnetic measurements; Grain size; Military aircraft; Shape; Transmission electron microscopy; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
