Title :
Preparation of high-Tc superconducting thick films and power conducting tubes by a low-pressure plasma spraying
Author :
Tachikawa, K. ; Ono, M. ; Shinbo, Y. ; Suzuki, T. ; Kabasawa, M. ; Kosuge, S.
Author_Institution :
Dept. of Mater. Sci., Tokai Univ., Kanagawa, Japan
fDate :
3/1/1989 12:00:00 AM
Abstract :
Superconducting thick films of YBaCuO and BiSrCaCuO systems have been prepared using a low-pressure plasma spraying technique. The chemical composition of the deposits was very close to that of the spraying powders. After postannealing the films showed zero resistance temperatures, Tc of ~90 K for YBaCuO and ~60 K for BiSrCaCuO. Superconducting power tubes were successfully produced by a low-pressure plasma spraying. 100-200-μm-thick YBaCuO superconducting films were deposited on the outer surface of the Ni-plated Cu tubes. After postannealing at 930°C for 1 h the films exhibited T c of 85-90 K. An improved film preparation process in which a flux layer is coated on the Y1Ba2Cu3O x matrix layer by a low-pressure plasma spraying has been developed. Enhanced critical currents have been achieved by this process
Keywords :
barium compounds; bismuth compounds; calcium compounds; critical currents; high-temperature superconductors; plasma arc spraying; strontium compounds; superconducting thin films; superconducting transition temperature; yttrium compounds; 100 to 200 micron; 60 K; 85 to 90 K; 930 degC; BiSrCaCuO; YBaCuO; chemical composition; critical currents; high temperature superconductivity; improved film preparation process; low-pressure plasma spraying; postannealing; power conducting tubes; spraying powders; superconducting thick films; zero resistance temperatures; Annealing; Atmosphere; Powders; Shape; Substrates; Superconducting films; Superconducting materials; Thermal spraying; Thick films; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
