Processing and fabrication of YBa sub 2 Cu sub 3 O sub x /Ag composite wires and coils

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:6281251

Ferrando, W A; Divecha, A P; Mansour, A N; Karmarkar, S D ^[1]; Balachandran, U; Dorris, S E; Dusek, J T; Picciolo, J J; Singh, J P; Poeppel, R B ^[2]

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1. Naval Surface Warfare Center, Silver Spring, MD (USA)
2. Argonne National Lab., IL (USA)

Silver was added to YBa{sub 2}Cu{sub 3}O{sub x} (123) powder by a melt technique using AgNO{sub 3} and heated to {approximately}600{degree}C to decompose the nitrate. This process yields 123 powder that is uniformly coated with Ag, as indicated by optical and scanning electron microscopy (SEM). The composite power is formed into rods ({approximately}4 mm diameter) via drawing and swaging through conical converging dies. Wires of finer diameter ({approximately}1 mm) and substantially greater linear uniformity have been produced by slurry extrusion of the composite powder in a polymeric vehicle. Transport critical current density, J{sub c}, of these wires at present is about 750 A/cm{sup 2}. This value may be expected to rise due to further reduction of second phase impurities localized at grain boundaries and better understanding of the Ag/superconductor interface. This paper describes the wire fabrication in some detail and discusses the results of microscopic analyses by scanning electron microscopy (SEM), x-ray photoemission spectroscopy (XPS), and x-ray diffraction (XRD). 11 refs., 4 figs., 1 tab.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: DOD; DOE/CE
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6281251
• Report Number(s): CONF-901125-8; ON: DE91006532
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
426001 -- Engineering-- Superconducting Devices & Circuits-- (1990-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DIFFRACTION
DRAWING
ELEMENTS
FABRICATION
HIGH-TC SUPERCONDUCTORS
MATERIALS WORKING
METALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SILVER
SUPERCONDUCTING COILS
SUPERCONDUCTING WIRES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WIRES
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES