High Ic in iron-clad MgB2 tape

摘要

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.