Title :
Fabrication and transport properties of MgB2/(SUS316/Cu) multifilament wires
Author :
Tanaka, K. ; Okada, M. ; Hirakawa, M. ; Yamada, H. ; Kumakura, H. ; Kitaguchi, H.
Author_Institution :
Hitachi Res. Lab., Hitachi, Ltd., Ibaraki, Japan
fDate :
6/1/2004 12:00:00 AM
Abstract :
100-m long MgB2 multifilament wires with stainless steel (SUS316)/Cu double sheath were successfully fabricated using a PIT method. No heat treatment was carried out during the processing. The Jc of the MgB2/(SUS316/Cu) multifilament wires reached 3700 A/mm2 at 4.2 K and 0 T, and up to 1000 A/mm2 at 1 T, an increase of 40% over conventional mono-core MgB2/(SUS316/Cu) tapes. The relationship between transport Jc and Vickers hardness (HV) for MgB2/(SUS316/Cu) wires with various wire diameters was investigated. The results suggest that a high-density superconductor core was possible for small filament size. The multifilament structure and densification of MgB2 core were found to be effective in improving the transport properties of MgB2 wires.
Keywords :
Vickers hardness; boron alloys; copper; critical current density (superconductivity); magnesium alloys; multifilamentary superconductors; superconducting tapes; type II superconductors; (SUS316)/Cu double sheath; 1 T; 4.2 K; Cu; MgB2; MgB2 multifilament wires; PIT method; Vickers hardness; core densification; critical current density; high-density superconductor core; mono-core tapes; multifilament structure; multifilament wire fabrication; stainless steel; transport Jc; transport properties; Fabrication; Heat treatment; Magnetic field measurement; Magnetic fields; Multifilamentary superconductors; Steel; Superconducting coils; Superconducting filaments and wires; Superconducting films; Temperature; $hbox MgB_2$; Critical current density; multifilament wire; stainless steel/Cu double sheath;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2004.830388
