Fabrication and characterisation of superconducting Bi-2223/Ag tapes with high critical current densities in km lengths

• Published in: IEEE transactions on applied superconductivity 1999-06, Vol.9 (2), p.2537-2540
• Main Authors: Han, Z., Bodin, P., Wang, W.G., Bentzon, M.D., Skov-Hansen, P., Goul, J., Vase, P.
• Format: Article
• Language: English
• Subjects: Applied sciences; Bi-based cuprates; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Critical current; Critical current density; Cuprates superconductors (high tc and insulating parent compounds); Electrical engineering. Electrical power engineering; Exact sciences and technology; Fabrication; Laboratories; Large-scale systems; Materials; Physics; Powders; Production; Scanning electron microscopy; Superconducting films; Superconducting magnets; Superconductivity
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/77.785003

Long length Bi-2223/Ag tapes with high critical current densities are needed for large-scale applications. In this paper, recent results from NST are being presented, describing recent results reaching critical current densities of 23 kA/cm/sup 2/ and engineering critical current densities of 5.2 kA/cm/sup 2/ at 77 K over the whole length of a 1250 metre long Bi-2223/Ag tape. To our knowledge this is the highest critical current density reported for Bi-2223/Ag tapes longer than 1 km. The approach for improving the homogeneity and the considerations of processing and handling the long length tape are presented. Various Ag alloy sheathed Bi-2223 tapes have been made by our standard production line. The properties of these tapes are compared.