Speaker
Description
Bi-2212 is a promising high-temperature superconductor (HTS) for ultra-high field magnet applications, owing to its exceptional current-carrying capacity under high magnetic fields, good mechanical stability, and unique isotropic round wire structure. The Northwest Institute for Nonferrous Metal Research (NIN) has been actively engaged in advancing the performance and industrial development of Bi-2212 superconducting wires. This paper provides a comprehensive overview of recent progress of Bi-2212 development in NIN. Significant efforts have been made to optimize the precursor powders prepared via the spray pyrolysis method, with a focus on compositional tuning and process improvements to ensure homogeneity and high purity. Advances in wire structure design, including the adjustment of filament numbers and structural configurations, have further enhanced the structural integrity of Bi-2212 wires during deformation process. The heat treatment processes have also been optimized to improve the grain connection of Bi-2212. In addition, this paper also introduces the development of Bi-2212 cables and conductors, demonstrating their structural integrity and superior performance in high-field environments. These achievements are complemented by progress in scaling up the production of Bi-2212 wires, addressing challenges in reproducibility and scalability to meet industrial demands.
