Joining of Bi-Pb-Sr-Ca-Cu-O Superconductors

C. H. Kao ； H. L. Chern ； M. K. Wu

《Chinese Journal of Physics》 34卷2S期 (1996/04) Pp. 325-329

並列摘要

The weldability of (Bi,Pb)2Sr2Ca2Cu3Oy, bulk materials was investigated by a CO2, laser with the scanning speed of 40-50 mm/set. Results of X-ray diffraction pattern, SEM and EDS showed the decomposition of the high-Tc phase in the laser irradiated region. Xon-superconducting phases such as CaO and (Sr1-xCar)CuOy were found to be in the melting zone, whereas (Sr1-x,Car)CuOy and 2212 phases were found in the heat-affected zone. When the irradiated samples were treated with 835℃ for 48 h in air, the laser treated region changed into the high-Tc as a major phase, in addition to the low-Tc phase and non-superconducting phase, indicating that the high-T, BPSCCO superconductors are weldable by the CO2 laser. However, the high-Tc phase was piled up randomly. The transport critical-current density of the laser treated samples after annealing was lower than that of the original sintered one, i.e. at 77K and zero magnetic field.