The effect of fabrication variables on filament quality of mono and multifilament BSCCO-2212 round wires
- Univ. of Wisconsin, Madison, WI (United States); and others
Round silver-sheathed Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub x} Mono and Multifilamentary Wires (19, 31 and 361 filaments) were made with and without extrusion and by drawing. Hexing the monofilaments at a smaller size led to better filament quality in the multifilamentary composites compared to hexing them at a larger size. Wires with a small Ag:BSCCO ratio (<1:1) could not be drawn reliably with 20% reduction in area per pass but could be drawn at 10% per pass. However, using 10% reduction per pass in the multifilament stage created incipient center-burst defect problems and the final filament quality was degraded. Wires made from finer BSCCO powder had higher critical current density (J{sub c}). The J{sub c} of the better quality composites increased with decreasing filament diameter. Extrusion of multifilament stacks at room temperature and small reduction ratios (3:1) produced much better filament quality than extrusion at 250{degrees}C and larger ratios (10:1).
- OSTI ID:
- 482082
- Report Number(s):
- CONF-950722-; ISSN 0065-2482; TRN: 97:010597
- Journal Information:
- Advances in Cryogenic Engineering, Vol. 42B; Conference: CEC/ICMC `95: cryogenic engineering conference and international cryogenic materials conference, Columbus, OH (United States), 17-21 Jul 1995; Other Information: PBD: 1997
- Country of Publication:
- United States
- Language:
- English
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