Powder-metallurgy-processed A15 Nb/sub 3/Al superconducting wires
The possibility of the manufacture of superconducting A15 Nb/sub 3/Al wires by a powder metallurgy process was explored. A T/sub c/ value of 17 K and overall J/sub c/ value of > 10/sup 4/ A/cm/sup 2/ at 15 teslas and 4.2 K were obtained. The variations of both T/sub c/ and overall J/sub c/ with the temperature and time of the heat treatment employed were investigated. Based on those, a multiple-step heat treatment was proposed and found to be beneficial to both T/sub c/ and overall J/sub c/. It is believed that this resulted from the improvement of the superconducting characteristics within the wire. The variations of the overall J/sub c/ with other processing parameters were also investigated. Based on the results obtained, the importance of the filament thickness of Nb and Al and the Nb-Al interfacial area in determining the critical current density was discussed. Preliminary characterization of the microstructure of the reacted layer within the powder wire was performed using a transmission electron microscope and the result was presented.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 7093460
- Report Number(s):
- LBL-14749; ON: DE82022057
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101 -- Metals & Alloys-- Preparation & Fabrication
420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALUMINIUM COMPOUNDS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
MANUFACTURING
METALLURGY
MICROSTRUCTURE
NIOBIUM COMPOUNDS
PHYSICAL PROPERTIES
POWDER METALLURGY
SUPERCONDUCTING WIRES
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
WIRES