Title :
Silver sheathed superconducting tapes made from the bi-system oxide powders mixed with metal Ag or Cu powders
Author :
Asano, T. ; Tanaka, Y. ; Fukutomi, M. ; Komori, K. ; Inoue, K. ; Maeda ; Yoshikawa, M. ; Naitoh, M.
Author_Institution :
Nat. Res. Inst. for Metals, Ibaraki, Japan
fDate :
1/1/1992 12:00:00 AM
Abstract :
Properties of Ag sheathed tapes of the 2212-phase Bi system were investigated. Prior to the packing into a Ag tube, calcined powders were mixed with metal powders of Ag and/or Cu by using an attrition-type mill and further heat-treated in vacuum. By this fabrication method, the crystal growth of the 2212 phase of the Bi system and superconducting properties were improved. The existing Ag in the low-Tc -phase Bi-system powder enhances the growth rate of the well-textured large grain of the 2212 phase and extends the temperature range for realizing good coupling in the grain boundaries
Keywords :
bismuth compounds; calcium compounds; ceramics; critical currents; grain growth; heat treatment; high-temperature superconductors; powder technology; strontium compounds; 2212-phase; Ag sheathed tapes; Bi2Sr2CaCu2Ox; attrition-type mill; calcined powders; critical currents; crystal growth; grain boundaries; growth rate; powder in tube method; shielding current; superconducting properties; superconducting tapes; vacuum heat treatment; well-textured large grain; Cooling; Heat treatment; Magnetic materials; Milling machines; Powders; Silver; Superconducting coils; Superconducting films; Superconducting materials; Temperature distribution;
Journal_Title :
Magnetics, IEEE Transactions on
