Abstract Body

As one of the practical high temperature superconductors (HTS) with well-developed fabrication techniques, Bi-2223 HTS tapes have been successfully applied in many practical applications, such as high voltage current transport, superconducting motors, and current lead, etc. So far, the major supplier of Bi-2223 tapes is Sumitomo Electronic Industrial, who can supply Bi-2223 tapes with the length of over 1000 m and critical current of >200 A. Since 1990s, Northwest Institute for Nonferrous Metal Research started to develop the fabrication technique of Bi-2223 HTS tapes. After, nearly 30 years of study, we can provide the Bi-2223 tapes with the critical current of ~80 A under the ambient atmosphere heat treatment. Recently, new techniques have been developed in order to further enhance the current capacity of Bi-2223 tapes, including the introduction of spray pyrolysis technique for precursor powders fabrication and groove rolling process as well as the cryogenic drawing process for cold deformation. Meanwhile, key parameters, such as the chemical composition of precursor powders, filament structure configuration, and the rolling parameters have been systematically optimized. Therefore, based on these optimization, critical current has been obviously enhanced for 50% to over 120 A. And further optimization is on the way.

References

1. G. Osabe et al. Development of Ag-sheath Bi-2223 HTS wire at SEI. 35th ISS (2022)
2. C. Yao et al. Superconducting materials: Challenges and opportunities for large-scale applications. iScience 24 (2021) 102541
3. S. Zhang et al. Fabrication of multifilamentary powder in tube superconducting tapes of Bi-2223 with Sr deficient starting composition. Cryogenics 114 (2021) 103245
4. S. Zhang et al. Fabrication of Bi-2223 High Temperature Superconducting Tapes With Groove Rolling Process. IEEE Trans. Appl. Supercond. 30 (2020) 6400204
5. S. Zhang et al. Influence of calcination atmosphere on the phase evolution mechanism of Bi-2223 high temperature superconductor. J. Mater. Sci. Mater. Electron. 31 (2020) 12333-12344
6. X. Ma et al. Effect of Post-Annealing on the Phase Transformation and Critical Current Density of (Bi, Pb)-2223/AgAu Tapes. J. Supercond. Nov. Magn. 33 (2020) 1357–1364

Acknowledgment

The Authors would like to gratefully acknowledge the financial support from The Key Research and Development Program sponsored by the Ministry of Science and Technology (Grant No. 2022YFE03150101).