Infrared zone melting process for YBa sub 2 Cu sub 3 O sub 7 minus. delta. wires
- IRC in Superconductivity, University of Cambridge, West Cambridge Site, Madingley Road, Cambridge CB3 0HE (United Kingdom)
A novel process for the continuous densification of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} wires by infrared zone melting is presented. Superconducting ceramic wires with moderate porosity (20--40%) were passed through a high temperature infrared zone at a speed of 1--2 cm/min, which resulted in zone melting followed by fast solidification to give near zero porosity wires. The atmospheric conditions during zone melting had a significant effect upon the resultant properties and microstructure of the wires. The best results were obtained for infrared zone melting under a vacuum which resulted in the decomposition of the superconducting phase into four phases without significant macroscopic chemical segregation across the wire. Subsequent conventional sintering and annealing treatment of such wires fully restored them to polycrystalline YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} wires having 96% of the theoretical density. The maximum transport critical current density obtained for such wires at 77 K in zero magnetic field was 2.65{times}10{sup 3} A cm{sup {minus}2}. Normalized critical current values as a function of magnetic field indicated that the quality of the intergrain connections for vacuum infrared zone melted wires was significantly better than that for conventionally processed wires and tapes.
- OSTI ID:
- 5206233
- Journal Information:
- Journal of Materials Research; (United States), Journal Name: Journal of Materials Research; (United States) Vol. 6:9; ISSN JMREE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTAL STRUCTURE
CUPRATES
ELECTROMAGNETIC RADIATION
FABRICATION
HIGH-TC SUPERCONDUCTORS
INFRARED RADIATION
MELTING
MICROSTRUCTURE
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
QUATERNARY COMPOUNDS
RADIATIONS
SUPERCONDUCTING WIRES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
WIRES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZONE MELTING