Critical currents of superconducting BiPbSrCaCuO tapes in the magnetic flux density range 0–19.75 T at 4.2, 15, and 20 K

Abstract

Critical currents of superconducting silver-sheathed tapes of Bi1.8Pb0.4Sr2Ca2.2Cu3Ox have been measured in the magnetic flux density range 0–19.75 T at 4.2, 15, and 20 K. One tape achieved a critical current of 60.6 A at 19.75 T and 20 K; the corresponding critical current density is 551 A/mm2. In the same field, the tape has critical currents of 72.3 A (657 A/mm2) at 15 K and 94.2 A (856 A/mm2) at 4.2 K. At 77 K and in zero field, the tape carries 32.9 A (299 A/mm2). These results indicate that ‘‘high Tc’’ superconducting magnets of engineering interest may soon be feasible.

Processing and Properties of Silver-Clad Tl-Ba-Ca-Cu-O Wires and Tapes

“…Thus, the properties of these wires and tapes were determined by weak links, not flux pinning. The Jc values of the T1-Ba-Ca-Cu-O/Ag wires and tapes were below those quoted for melt-textured materials or Ag-clad (Bi,Pb)2Sr2Ca2Cu3Ox tapes [7,[16][17][18]. Relatively little fabrication work has been done to date, and properties are expected to improve.…”

Present Status and Future Perspective of Bismuth-Based High-Temperature Superconducting Wires Realizing Application Systems

“…In the early 1990s, a multifilamentary configuration was found to produce flexible wires, and thereafter the fabrication of long wires with a high I c was attempted. 8,9) In these attempts, there were a variety of research and development (R&D) themes, such as a combination of plastic deformation and heat treatments to obtain high I c , heat treatment atmosphere control to reduce non-superconducting phases and to obtain a high relative density, and metal foil lamination techniques to increase mechanical strength.…”

Recrystallization of high temperature superconductors

“…A significant improvement in the critical current density J, and flexibility has been achieved in Ag-clad B~~S T~C U C U~O~+~ [13,14,151 and Ag-clad B~~S T~C U~C U~O~~+~ [23,24,16,171. Major success has been achieved in producing nearly magnetic field independent Jc's which are already comparable or even superior than the ones in conventional superconductors, especially at fields above 20…”