Overpressure Processing of Bi-2212 Conductors

Abstract

The principal production route of Bi-2212/Ag conductors using the PIT process under ambient conditions has been described in Chap.7. From these results it became clear that porosity and void formation are a major problem in the fabrication of Bi-2212 wires and partly also in tapes. Reduction of porosity could be achieved by processing in 100% oxygen as reported by Zhang et al. [284]. Void and bubble formation could be reduced by a gas pressure melting process as proposed by [119] and also applied by Reeves et al. to Bi-2212 tapes [231]. Some detailed experiments have therefore been performed on overpressure processing of multifilamentary Bi-2212 wires and tapes in collaboration with the Applied Superconductivity Center of the University of Wisconsin at Madison.