Speaker
Description
Bi2Sr2CaCu2O8+x (Bi-2212) material, the only high-temperature superconducting material capable of being fabricated into isotropic round wires, holds significant potential for the future manufacturing of high-field magnets. In coil design and fabrication, the selection of coil radius is crucial, as an excessively small radius can substantially reduce the coil's current-carrying capacity. This study systematically investigates the impact of bending on the critical current performance of Bi2212 round wires. The wires were bent into arcs with varying radii before over pressure heat treatment. Following heat treatment, the wires were carefully transferred to a test board, where their critical current performance was evaluated at 4.2 K under background magnetic fields ranging from 10 to 20 T. The relationship between the bending radius and critical current performance was examined. Furthermore, the magnitude and distribution of stress within the wire during the bending process were simulated and compared. Lastly, the microscopic structure of the wires was analyzed using microscopy to explore the underlying mechanisms by which bending influences current-carrying capacity. These findings offer valuable insights for designing coil radii in practical applications.
Index Terms—Bi2212,bending,cracks,stress,current current
