Speaker
Dr
Alexander Otto
(Solid Material Solutions, LLC)
Description
This 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 of the ASP powder is at less than half the levels specified in standard available powder, with carbon at 40 ppm or lower. Process conditions have been developed for producing a range of well controlled phase compositions and the solution make up procedure controls composition to a less than 1% deviation from the target level for each cation. A capability has also been developed for the low cost, rapid production of high quality, small scale 2212 multifilament wire that is needed to help develop upstream wire attributes and identify superior powder types. 2212 critical current density in small scale wire is comparable to higher filament count, higher fill factor long length standard wire made with similar powder. These two methods in combination are being applied to develop 1) powder with superior Jc potential and 2) wire with lower defect rates, as well as more optimal architectures and silver matrix chemistries.
*This work was supported by Phase 1 SBIR DE-0011334 and the National High Magnetic Field Laboratory.*
Author
Dr
Alexander Otto
(Solid Material Solutions, LLC)
Co-author
Dr
William Carter
(Solid Material Solutions, LLC)
