Download or read book Recent Developments in Fabrication of Bi-2223 Conductors and Magnets written by and published by . This book was released on 1993 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Significant progress has been made in the fabrication of Bi-2223 high-{Tc}, high-critical-current-density (J{sub c}) superconductor tapes that are attractive for electrical power and high-field magnet applications. Long lengths ((almost equal to)100 m) of Ag-clad Bi-2223 tapes with high J{sub c} were fabricated by powder-in-tube technique and used to make compact and robust pancake coils by wind-and-react method. Three to five layers of tapes were co-wound with an insulation and heat treated to produce pancake coils. These coils were then stacked in series to make test magnets. The coils and magnets were characterized at temperatures of liquid nitrogen (77 K), pumped liquid nitrogen (64 K), liquid neon (27 K), and liquid helium (4.2 K). Recently, we assembled a magnet containing ten pancake coils ((almost equal to)480 m of tape) that generated magnetic fields as high as 2.6, 1.8, 0.53, and 0.36 T at 4.2, 27, 64, and 77 K, respectively. These results show promise toward practical utilization of high-{Tc} materials. Lengths of superconductor, 30--100 m long, are now being made, and 70-m lengths have been measured to carry 23 A (corresponding to J{sub c} (almost equal to) 1.5 x 104 A/cm2) at 77 K. Progress in the prototype manufacturing of long lengths of Bi-2223 conductor is discussed in this paper.