Abstract
The effect of extrusion on improving the critical current density (Jc) of Bi1.4Pb0.6Sr2Ca2Cu3Ox superconducting wires is investigated. Calcined powders (Bi1.4Pb0.6Sr2Ca2Cu3Ox) are first mixed with a forming aid—a thermoplastic polymer (polyethylene)—for workability, and then extruded, using a capillary rheometer, to form wires 2 mm in diameter. The Jc value, measured by the four‐probe method in liquid nitrogen at 77 K, is improved substantially by the following process: (1) the superconducting precursors are extruded at high viscosity with a forming aid, to align the platelike particles unidirectionally; (2) the forming aid alone is carefully burned out, without destroying the extruded configuration; and (3) the extruded wires are annealed at 850°C in air for more than 96 h.
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