Fabrication of Bi-2223 superconducting thick films via a non-vacuum method on silver foil substrates
In this study, high temperature superconducting (Bi,Pb)2Sr2Ca2Cu3O x (Bi-2223) films about 8 μm thick were fabricated by using a non-vacuum method. The precursor films was dip-coated on silver foil substrates and heat-treated. To prevent the evaporation of Bi and Pb at high temperatures, a "powder-in-foil" method was used. The heat treatment consisted of two steps with an intermediate pressing process, similar to the powder-in-tube (PIT) technique for Bi-2223/Ag superconducting tapes. The optimized samples showed a critical current density of about 29 kA/cm2 (77 K, self-field), which was comparable to that of commercial PIT Bi-2223/Ag tapes. This study provided an efficient new method to fabricate Bi-2223 long wires capable to carry considerable superconducting current.
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Document Type: Research Article
Publication date: October 1, 2016
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