Title :
High Ic in iron-clad MgB2 tape
Author :
Fang, H. ; Padmanabhan, S. ; Zhou, Y.X. ; Putman, P.T. ; Salama, K.
Author_Institution :
Texas Center for Supercond. & Adv. Mater., Univ. of Houston, TX, USA
fDate :
6/1/2003 12:00:00 AM
Abstract :
Recent studies on metal-clad superconducting MgB2 wires indicates that iron is one of the best candidates as a cladding metal. Also it was found that grain refinement of MgB2 leads to more compacted material which yields high transport critical current density. In this study, we prepared the iron-clad MgB2 tapes by using the powder-in-tube technique. A modified rolling process was applied to cold work the powder-filled tubes into tapes. Very fine grains were observed on as-rolled tapes. Tapes manufactured using this process were found to carry 260 Ampere at 20 K under self-field and 180 Ampere under 1.5 Tesla. The transition temperature is 39.4 K and ΔT=0.6 K. The results indicate that grain refinement is very effective in improving the current carrying capability of the MgB2 tapes.
Keywords :
critical current density (superconductivity); grain refinement; iron; magnesium compounds; powder technology; superconducting tapes; superconducting transition temperature; type II superconductors; 1.5 T; 180 A; 20 K; 260 A; Fe-MgB2; critical current density; grain refinement; iron-clad tapes; metal-clad superconducting wires; modified rolling process; powder-in-tube technique; transition temperature; Critical current density; Heat treatment; Iron; Powders; Refining; Superconducting films; Superconducting materials; Superconducting transition temperature; Superconductivity; Wires;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2003.812199
