The effect of fabrication variables on filament quality of mono and multifilament BSCCO-2212 round wires

Journal Article · Sun Jun 01 04:00:00 EDT 1997 · Advances in Cryogenic Engineering

OSTI ID:482082

Karuna, M; Hellstrom, E E; Zhang, W ^[1]

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1. 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--
• Journal Information: Advances in Cryogenic Engineering, Journal Name: Advances in Cryogenic Engineering Vol. 42B; ISSN 0065-2482; ISSN ACYEAC
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
CRITICAL CURRENT
EXTRUSION
HIGH-TC SUPERCONDUCTORS
SILVER
STRONTIUM OXIDES
SUPERCONDUCTING WIRES