Research Progress on Preparation Technology of Practical Bi-Based Superconducting Tape.

Superconducting materials have excellent electrical and magnetic properties and have great development prospects. NbTi and Nb3Sn are currently the two most widely used low-temperature superconducting materials, but they require liquid helium refrigeration to be used at 4.2 K ultra-low temperature, which is costly. The critical superconducting temperature of Bi-2223 is as high as 110 K, and can use liquid nitrogen for cooling, showing good practical value. Bi-2223 is a compound with a layered structure, which is often prepared into tapes, so that the layer direction is parallel to the surface of the tape to exert its best superconductivity. However, on the road to its practical application, there are still problems such as insufficient purity of Bi-2223 phase, insufficient density, poor crystal grain connectivity, insufficient tensile strength and elongation. In order to be practical, factors such as electrical performance, mechanical performance, and refrigeration technology must be both considered. This paper summarizes the preparation technology and research progress of the practical Bi-based superconducting tape. The preparation process of Bi-2223 precursor powder, the preparation process and research progress of Bi-2223 tape, the progress of the practical application of Bi-2223 superconducting tape, etc. are introduced respectively, which provide references for further in-depth research on its preparation process and practical application. [ABSTRACT FROM AUTHOR]