Conveners
M3OrC - Superconductor Wires V: BSCCO Processing and Properties
- Eric Hellstrom (ASC/NHMFL/FSU)
- Kenichi Sato (Sumitomo Electric Industries, Ltd.)
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Prof. Eric Hellstrom (Applied Superconductivity Center, National High Magnetic Field Laboratory, Florida State University)01/07/2015, 14:00ICMC-03 - BSCCO Processing and PropertiesInvited Oral PresentationOverpressure (OP) processing Bi-2212 round wire increases Jc and Je in long-length wire to values needed for practical applications in high-field magnets. In the past, OP processing of Bi-2212 coils was limited to small coils ~45 mm OD and ~25 cm long that could fit in the small, horizontal OP furnaces available at ASC and Fermi National Accelerator Laboratory. We worked with a furnace...Go to contribution page
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Yavuz Oz (National High Magnetic Field Laboratory)01/07/2015, 14:30ICMC-03 - BSCCO Processing and PropertiesContributed Oral PresentationIt is now understood that the critical current density $J_c$ of Bi-2212 is optimized when the density of the filaments is maximized by overpressure processing. What is not yet clear is the way that the intrinsic current density determined by vortex pinning may be compromised by poor connectivity. Overpressure processing almost completely removes obstructions to the current path introduced by...Go to contribution page
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Cory Myers (Ohio State University)01/07/2015, 14:45ICMC-03 - BSCCO Processing and PropertiesContributed Oral PresentationInterfilamentary bridging in Bi2212 conductors influences magnetization levels that are important for accelerator magnet applications. Specifically, bridging-induced magnetization is a linear function of sample length (L) and twist pitch (Lp). Magnetization measurements were made on state of the art Bi2212 strands with an 37 x 18 filament configuration (both as short straight samples and small...Go to contribution page
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Dr Alexander Otto (Solid Material Solutions, LLC)01/07/2015, 15:00ICMC-03 - BSCCO Processing and PropertiesContributed Oral PresentationThis paper describes the development of a flexible approach for producing high-purity 2212 powder by low cost, single step aerosol spray pyrolysis (ASP) that also allows for the immediate packing and sealing of the powder into the silver billet, thereby avoiding contamination and agglomeration. Together these vital components form the superconducting filaments in the wire. The impurity content...Go to contribution page
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Mr Joshua Kellams (Texas A&M University)01/07/2015, 15:15ICMC-03 - BSCCO Processing and PropertiesContributed Oral PresentationA new approach to the preparation of cores for Bi-2212/Ag wire is being developed. Nanoparticle Ag is homogeneously dispersed in Bi-2212 fine powder, and the mixture is uniaxially compressed to form highly textured, cold-sintered core rods. The rods can be assembled with a Ag matrix and drawn to form multifilament wire. Preliminary studies using tablet geometry demonstrate that a non-melt...Go to contribution page
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YUN ZHANG (North Carolina State University)01/07/2015, 15:30ICMC-03 - BSCCO Processing and PropertiesContributed Oral PresentationBi2Sr2CaCu2Ox (Bi2212)/Ag multifilamentary wires are manufactured via the powder-in-tube process using oxide powders. The properties of the precursor powders, including stoichiometry, purity, grain size and morphology, packing density and phase assembly, have significant impact on wire properties after heat treatment. Most research has focused on the processing of wire after deformation due to...Go to contribution page
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Ms YUN ZHANG (North Carolina State University)01/07/2015, 15:45ICMC-03 - BSCCO Processing and PropertiesContributed Oral PresentationBi2Sr2CaCu2Ox (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...Go to contribution page