Processing and Properties of BSCCO 2212 Ag and Ag Alloy Multifilament Round Wires
Ag-sheathed Bi2Sr2CaCu2Ox round wires having 37, 259, and 703 filaments were fabricated by the oxide-powder-in-tube (OPIT) method. The wires were heat treated using step-solidification melt processing in pure O2. In addition to pure silver sheaths, wires with Ag-Al and Ag-Zr sheaths were also fabricated. The critical current density (Jc) at 4.2 K, zero field, shows significant improvement in strain tolerance for bending strains up to 1 % for dispersion strengthened multifilament 2212 wire designs over wires with pure silver sheaths. The transport critical current density at liquid helium temperature (4.2 K) approached 200,000 A/cm2 in zero field and 45,000 A/cm2 at 15 Tesla. At liquid neon temperature (27 K) the Jc was about 75,000 A/cm2 zero field and dropped rapidly to zero at 10 Tesla.
KeywordsApplied Magnetic Field Critical Current Density Zero Field Strain Tolerance Pure Silver
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