Thermal Cycling of (RE)BCO-Based Superconducting Tapes Joined by Lead-Free Solders.

ABSTRACT: We prepared overlap soldered joints of high-temperature superconducting tapes, using various materials and preparation conditions. In order to select the joints with optimal performance, we correlated their electrical properties (derived from current-voltage curves) with the microstructure of the respective joint cross-section by scanning electron microscopy. With the first group of joints, we focused on the effect of used materials on joint resistivity and critical current, and we found that the dominant role was played by the quality of the internal interfaces of the superconducting tape. Initial joint resistivities ranged in the first group from 41 to 341 nΩ·cm2. The second group of joints underwent a series of thermal cyclings, upon which the initial resistivity range of 35-49 nΩ·cm2 b

SUBMITTER: Skarba M 

PROVIDER: S-EPMC7926784 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature