Processing and properties of Ag-clad Bi-2223 tapes
- Argonne National Lab., IL (United States)
- Intermagnetics General Corp., Guilderland, NY (United States)
- IGC/Advanced Superconductors, Inc., Waterbury, CT (United States)
We prepared partially reacted, polyphase, Pb-doped Bi-Sr-Ca-Cu-O (2223) powders by solid-state and wet-chemical routes. The calcined powders were characterized by thermal analysis, x-ray diffraction, and scanning electron microscopy. We then fabricated long lengths of flexible Ag-clad 2223 tapes by the powder-in-tube technique. Multifilamentary conductors have been prepared by stacking circular single-core Ag-sheathed superconductor rods into larger Ag tube and then drawing and rolling the tube to final size. The tapes were given appropriate heat treatment and the growth of the 2223 phase at each step of the heat treatment was studied. At 4.2 and 27 K, improved process conditions yielded transport critical current density (J{sub c}) values > 10{sup 5} A/cm{sup 2} at zero field; at 77 K, J{sub c} exceeded 4 {times} 10{sup 4} A/cm{sup 2}. Using a two-step rolling with an intermediate heat treatment, we have fabricated conductors {approx}70 m long. The J{sub c} value of these long conductors is {approx}2 {times} 10{sup 4} A/cm{sup 2} at 77 K in self field. Superconducting pancake coils were fabricated from the long-length tapes by the wind-and-react technique.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 10110471
- Report Number(s):
- ANL/ET/CP-81211; CONF-931238-1; ON: DE94004603
- Resource Relation:
- Conference: 6. US-Japan workshop on superconductivity,Houston, TX (United States),6-7 Dec 1993; Other Information: PBD: Nov 1993
- Country of Publication:
- United States
- Language:
- English
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