Yun Zhang is working on Bi2Sr2CaCu2Ox (Bi2212) superconductors involves processing and characterization of the precursors as well as multifilamentary wires to understand the relationships among precursor properties, microstructures and wire performance.
Currently, Bi2Sr2CaCu2Ox (Bi2212) /Ag multifilamentary wires are manufactured via the powder-in-tube process using oxide powders. After deformation, the wires undergo a partial-melt process, resulting in a complex, heterogeneous microstructure containing multiple secondary phases and porosity, limiting the wires’ electrical and mechanical performance. I am working on two different projects- one is to develop high-quality Bi2212 oxide precursor powders in collaboration with nGimat, Llc and the other one is to develop a new method to process Bi2212 wire via metallic precursors. We proposed an alternative approach using the direct conversion of metallic precursors (MPs) to Bi2212. The metallic precursors are synthesized via mechanical, filled in Ag/Ag-alloy tube and then converted to superconducting Bi2212 after the wire is deformed through heat treatment in an oxidizing atmosphere.
- Synthesis of Bi2Sr2CaCu2Ox superconductors via direct oxidation of metallic precursors. Yun Zhang et al 2014 Supercond. Sci. Technol. 27 055016