Optimized fabrication of highly textured bismuth strontium calcium copper oxide/silver superconducting tape through mechanical deformation and controlled melt processing.

摘要

Engineering applications of high temperature superconducting oxides, in either bulk or thin film form, demand synthesis and processing that lead to chemically, mechanically, and electronically optimized microstructures. The achievement of such ideal microstructures depends upon fulfilling: (i) a high degree of densification, (ii) a sharp crystallographic texture characterized by a high degree of alignment of superconducting crystal planes lying parallel to the conducting direction, and (iii) a minimal volume % of second phase particles. The need for a strong microstructural control is due to the intrinsic anisotropic properties, weak-link effect, and flux creep phenomena associated with these materials.;Three techniques have been developed to mitigate the problems in Bi-Sr-Ca-Cu-O (BSCCO) superconductors. These are: production of high density, production of superconductor/silver composites, and production of highly textured superconducting tapes. The problems associated with densification in sintering of high-;For the melt processed 2212 BSCCO/Ag tapes, minimization of the second phase particles, which severely interrupt the local 2212 alignment and reduce ;In the present study, the texture evolution in a high-