Superconducting coils with different dimensions were manufactured via a wind-reaction process by using Fe-sheathed MgB2 wires, which were fabricated using the powder-in-tube method and ultra-fine starting precursors. Very good grain connectivity as well as high core density was obtained in Fe-sheathed wires and tapes. At 20 K and self-field, the critical current of the coil with ID 12 mm and 12 turns is 360 A, which is equivalent to the J c of 1.8 × 105 A/cm2. At 6 Tesla external magnetic field and 4.2 K, the coil with ID 14 cm and 10 turns possesses the Jc of 1 × 104 A/cm2. In-field current carrying capability of MgB2 wires and tapes were further enhanced by Ti additive. These results demonstrate the potential of MgB2 superconducting wires and tapes for large-scale applications.
- Critical current density
- Magnesium diboride
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering