Progress in superconducting performance of rolled multifilamentary Bi-2223 HTS composite conductors

• Published in: IEEE transactions on applied superconductivity Vol. 7; no. 2; pp. 2026 - 2029
• Main Authors: Li, Q., Riley, G.N., Parrella, R.D., Fleshier, S., Rupich, M.W., Carter, W.L., Willis, J.O., Coulter, J.Y., Bingert, J.F., Sikka, V.K., Parrell, J.A., Larbalestier, D.C.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.1997; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Conductors; Critical current; Critical current density; Electric connection. Cables. Wiring; Electrical engineering. Electrical power engineering; Exact sciences and technology; Flux pinning; High temperature superconductors; Laboratories; Magnetic fields; Materials; Multifilamentary superconductors; Superconductivity; Temperature dependence; Various equipment and components
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/77.620988

Significant enhancements in critical current densities in rolled multifilamentary Bi-2223 HTS composite conductors have been achieved using the powder-in-tube (PIT) technique. At 77 K and self field, oxide critical current densities (J/sub c/) of 55 kA/cm/sup 2/, overall or engineering critical current densities (J/sub e/) of 15 kA/cm/sup 2/, and critical currents (I/sub c/) of 125 A have been achieved in different rolled multifilamentary composites. Progress in achieving such high electrical performance is believed to stem in part from an improvement of grain connectivity by reducing weak links. The J/sub c/ dependence on magnetic field (B) and the degree of c-axis texture of these high quality conductors have been investigated at various temperatures. Our results also demonstrate that the critical current retention in magnetic field can be independently controlled from the self field critical current density, suggesting that flux pinning improvements and weak link reductions can be separately engineered into Bi-2223 composites fabricated using manufacturable processes.