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Superconducting joints are one of the crucial components to make iron-based superconducting wires or tapes successful for future high-field application. A process for fabricating superconducting joints between Sr1-xKxFe2As2 (Sr-122) tapes is developed for the first time [1]. The diffusion bonding of the iron-based superconducting joint was achieved by hot-pressing process in Argon atmosphere. The microstructures, superconducting properties, and element distribution in the connection areas were researched. The pressure and compressing time were optimized in order to enhance the transport current of the joints. The best transport critical current of 57 A was achieved at 4.2 K and 10 T; meanwhile, the critical current ratio of the joint was realized to be 63.3% (4.2 K and 10 T), which is the highest value of the iron-based superconducting joint reported so far [2]. These results clearly demonstrate that the iron-based superconductors are very promising for high-field magnet applications.
[1] Y. C Zhu, D. L. Wang, C. D. Zhu, H. Huang, Z. T. Xu, S. F. Liu, Z. Cheng, and Y. W. Ma, “Development of superconducting joints between iron-based superconductor tapes”, Supercond. Sci. Technol., 31 (2018) 06LT02.
[2] Y. C Zhu, D. L. Wang, H. Huang, G. X. Xu, S. F. Liu, Z. Cheng, and Y. W. Ma, “Enhanced transport critical current of iron-based superconducting joints”, Supercond. Sci. Technol., 32 (2019) 024002.
Keywords - iron-based superconductor, superconducting joint, transport properties, hot press
