Title :
A comparison of Ag and Ag-alloy sheathed Bi-2223 tapes
Author :
Liu, Hua K. ; Zhang, Zhong M. ; Zeng, Rong ; Horvat, Josip ; Apperley, Miles
Author_Institution :
Inst. for Supercond. & Electron. Mater., Univ. of Wollongong, NSW, Australia
fDate :
6/1/2003 12:00:00 AM
Abstract :
Ag and Ag-alloy sheathed Bi-2223 tapes were fabricated by a powder-in-tube technique with different configurations of the precursor and restack sheath materials: Ag, AgAu7 wt%, AgSb0.6 wt%, AgMg0.2 wt%. Analysis of the Ic and volume fractions of the Bi-2223, Bi-2212, Bi-2201 and Bi-3221 phases indicated that volume fractions of Bi-2223>90%, Bi-2212∼5%, Bi-2201∼0% and Bi-3221<2%, normally result in tapes with the highest Ic. The mechanical properties of the tapes revealed consistent results. Generally, the harder the sheath material, the higher tolerance to the bending strain and higher the tensile strength of the tape. The sequence of the alloys´ hardness from highest to lowest was AgMg0.2 wt%, AgSb0.6 wt%, AgAu7 wt% or Ag.
Keywords :
bending strength; bismuth compounds; calcium compounds; critical currents; hardness; high-temperature superconductors; lead compounds; phase separation; silver; silver alloys; strontium compounds; superconducting tapes; tensile strength; (BiPb)2Sr2Ca2Cu3O10-Ag; Ag sheathed Bi-2223 tape; Ag-alloy sheathed Bi-2223 tapes; bending strain; critical current; hardness; mechanical properties; phase volume fraction; powder-in-tube technique; tensile strength; Australia; Bismuth; Critical current; Current measurement; Heat treatment; Magnetic field measurement; Mechanical factors; Superconducting materials; Superconductivity; Temperature;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2003.812052
