Preparation and Properties of High Performance MgB 2 /Ni Superconducting Wire With Improved Internal Magnesium Diffusion Process

MgB2superconducting wires made with internal magnesium diffusion (IMD) process have reached an excellent performance than other routes. However, the incomplete Mg/B reaction has been the core problem of IMD process. In this study, MgB2/Ni IMD superconducting monofilament wires were prepared using the improved IMD process. By exploring annealing processes during fabrication, we improved the ductility of the wires and ensured the uniform continuity of the central Mg core filaments. The optimal heat treatment process for MgB2/Ni IMD wires was ascertained by micro structural morphology analysis, phase structure analysis, superconducting property analysis. The study demonstrates that this processing technique leads to a more complete reaction between Mg and B after heat treatment. The critical current density of MgB2/Ni super-conducting wires was measured at 4.2 K, demonstrating high current-carrying capabilities, particularly at high magnetic fields. This research provides valuable insights for the processing and heat treatment of MgB2/Ni multi-core superconducting wires in the future.