Title :
Microstructure and Jc improvements in overpressure processed Ag-sheathed Bi-2223 tapes
Author :
Yuan, Y. ; Jiang, J. ; Cai, X.Y. ; Patnaik, S. ; Polyanskii, A.A. ; Hellstrom, E.E. ; Larbalestier, D.C. ; Williams, R.K. ; Huang, Y.
Author_Institution :
Appl. Supercond. Center, Univ. of Wisconsin, Madison, WI, USA
fDate :
6/1/2003 12:00:00 AM
Abstract :
Overpressure (OP) processing influences the microstructure and critical current density (Jc) of Ag sheathed Bi-2223 tapes. SEM and mass density measurements show higher core density and fewer micro-cracks in OP tape than in 1 atm tape. The self-field critical current density, Jc (0 T, 77 K) in multifilamentary tapes was increased from 33.5 kA/cm2 with 1 atm processing (1 atm IR) to 48 kA/cm2 with OP processing (OP pressure = 148 atm) after the first heat treatment (OP HT1), and to 58.7 kA/cm2 with OP processing after intermediate rolling (OP IR). The corresponding values for Jc (0.1 T, 77 K) are 12.3 kA/cm2 (1 atm IR) to 18.2 kA/cm2 for OP HT1 and to 22.4 kA/cm2 for OP IR.
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); heat treatment; high-pressure effects; high-temperature superconductors; lead compounds; materials preparation; microcracks; multifilamentary superconductors; rolling; scanning electron microscopy; silver; strontium compounds; superconducting tapes; (BiPb)2Sr2Ca2Cu3O-Ag; 0.1 T; 1 atm; 148 atm; 77 K; OP tape; SEM; core density; heat treatment; intermediate rolling; mass density measurement; microcracks; microstructure; multifilamentary tapes; overpressure processed Ag-sheathed Bi-2223 tapes; self-field critical current density; Argon; Ceramics; Critical current density; Density measurement; Heat treatment; Helium; High temperature superconductors; Microstructure; Multifilamentary superconductors; Superconducting filaments and wires;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2003.812047
