Abstract
Bi-2223/Ag superconducting tapes are available in long lengths and are suitable for various applications. However, the presence of the Ag alloy sheath is a great obstacle for achieving low cost and high mechanical properties. In this paper, a new nickel clad Bi-2223/Ag/Ni complex structure was proposed in order to improve the critical current and also to increase the mechanical strength. In the preliminary experiments, short samples were clad into the 50μm thick nickel foil. Heat treatment under reduced oxygen atmosphere (pO2<0.20bar) was introduced to recover the mechanical damage during the cladding process. It is essential to have an open window in the Ni clad to allow the diffusion of oxygen. By controlling the width of this open window, the Jc values (77K, self field) of the clad tapes was not only fully recovered, but also increased by 7% because of the magnetic shielding effect.
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