BSCCO/Ag tapes made by a tape-in-rectangular tube process
Multi-core tape composites with various filament configurations have been made by a tape-in-rectangular tube (TIRT) process. This TIRT process is based on the deformation of multifilamentary composites assembled from a rectangular Ag (Ag-alloy) tube filled by pre-deformed single-core BSCCO/Ag tapes. Two-axial rolling induces texture in the filaments in two rolling planes, with the filament planes oriented parallel or perpendicular to the tape width, thus reducing the high [iopmath latex="$I_c$"] Ic [/iopmath] anisotropy which can degrade the total current in coils working at high temperatures (77 K). The homogeneity of the filaments was studied by a magneto-optical technique. Roll-sintered samples were measured at 77 K in an external magnetic field up to 1 T and at constant fields (0.1 T and 0.5 T) at various orientations (between parallel and perpendicular) to the tape surface. The results demonstrate the possibility of using these tapes for selected parts of a coil winding to reduce the apparent effect of the radial field component on the reduction of the total coil current.
Document Type: Miscellaneous
Institute of Electrical Engineering, Slovak Academy of Sciences, Dúbravska cesta 9, 842 39 Bratislava, Slovakia
School of Metallurgy and Materials, University, Birmingham B15 2TT, UK
Publication date: March 1, 2001