Fabrication of Superconducting Joints for Ag-Clad BSCCO Conductors
Potential applications of high-Tc superconductors include motors, generators, transmission cables, magnets, etc. At present, resistive connections are used to connect various high-Tc components for such applications. However, to improve efficiency, it is imperative that the resistive connection be replaced by a true superconducting joint. Using a novel etching technique, we have fabricated superconducting lap and butt joints between Ag-clad BSCCO conductors. The Ag sheath from one side of the tape was selectively etched to expose the underlying superconductor core. Joints were formed by bringing the two tapes together and heat treating them. Detailed microstructural analysis and current transport measurements of the joints have been performed. Critical current (Ic) through a monofilament lap- and butt-joint were 10 and 23 A, respectively. Ic within the joint for mono- and multifilament conductors were 37 and 21 A, respectively. Additionally, effects of various joint configurations, processing techniques, and strain on the transport property of the joint are also being studied.
KeywordsThermomechanical Treatment Current Transport Butt Joint Joint Configuration Resistive Connection
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