High-Tc Superconducting Joints for Ag-Clad Bi-2223 Tapes

摘要

[[abstract]]A high-ir, superconducting tape joint between two Xg-clad 81-2223 tapes has beenfabricated and characterized. Two pre-sintered tapes with one side of the silver stripedwere lapped and then wrapped by a silver foil. The complex was uniaxially pressedand followed b- appropriate sinterin, yr to form a high-�l; superconducting tape joint.Transport critical current through the joint (icj) was determined at liquid nitrogentemperature. It KS found that the ratio of critical currents through the joint to that ofthe tape, I,j/I,, depended on the uniaxial pressure and the slntering conduction. Fora test sample, I,j/I, reached 99~. Persistent current loops formed by Bi-2223 tapeshave also been fabricated and tested. Joint resistance of a loop was determined 10 be- 4 x lo-l3 R after the initial decay time of 2 minutes.