Abstract
The glass-coated melt spinning of Pb alloy was investigated to produce a superconducting long filament with Tc more than 4.2 K.
Continuous smooth filaments less than 60 μm in diameter of Pb, and Pb–Bi, Pb–In and Pb–Sn system alloys, and of Pb84.4Au15.6 and In2Bi alloys were obtained from a molten state at 1450 K with various spinning speeds ranging from 0.95 m/s to 7.95 m/s. The Pb system alloy filament obtained was a ductile material with the tensile strength of 40 MPa and elongation of 2.0%.
The Tc of the Pb alloy filament did not depend on the sample current density (Js) less than 3×107 A/m2, whereas the Tc of the Pb filament depended on the Js more than 2×106 A/m2. The maximum Tc at 8.0 K was observed for the Pb60.2Bi39.8 filament.
The enhancement of superconductivity was observed for the Pb70Sn30 and Pb65Sn35 filaments.
