Speaker
Ms
YUN ZHANG
(North Carolina State University)
Description
Bi2Sr2CaCu2Ox (Bi2212)/Ag multifilamentary wires are manufactured via the powder-in-tube process using metallic precursors (MP). After deformation, the MP is converted to Bi2212 by heating in flowing oxygen. Previous results on pellets show that via mechanical alloying, a controlled stoichiometry and homogeneous MP powder was synthesized. The MP powder was then converted to superconducting Bi2212 through a simple two-step heat treatment. By introducing oxygen at a temperature at which Bi2212 is a stable phase, and holding at an elevated temperature for a sufficient time, the metallic precursors were oxidized and transformed into Bi2212. Here, several factors that impact the formation and growth of Bi2212 grains are discussed. Furthermore, a multifilamentary wire containing metallic precursors is made, heat treated and analyzed. Results of chemical analysis, transport properties, magnetic behavior, microstructure and phase assemblage of metallic precursors and heat treated wires are reported.
Primary author
Ms
YUN ZHANG
(North Carolina State University)
Co-authors
Prof.
Justin Schwartz
(north carolina State University)
Prof.
carl koch
(north carolina state university)
