Comparison of A15-Nb/sub 3/Al superconductors produced by laser alloying and infiltration
Nb/sub 3/ (Al, Si, Bi) and Nb/sub 3/Al superconductors were successfully prepared by a laser alloying and an infiltration process. The continuous CO/sub 2/ laser irradiation was performed on Nb-sheated Nb-25 at .% Al composite tapes prepared by a conventional powder metallurgical method. For a laser power of less than 3.5 kW and specimen moving velocities up to 30 m/min almost stoichiometric Nb/sub 3/Al with critical temperatures of 16.6 K and critical current densities of 10/sup 4/ A/cm/sup 2/ at 15 T were obtained. For infiltration, sintered Nb powder was immersed in a liquid (Al/sub 88.7/Si/sub 11.3/)/sub 99/Bi/sub 1/ alloy. Subsequently the infiltrated rod was deformed and reacted at temperatures of up to 2000/sup 0/C. The microstructure and the superconducting properties have been studied in dependence of the degree of deformation and the reaction temperature. Critical temperatures between 14 and 18 K, upper critical fields B/sub c2/ of 21 T and critical current densities of 10/sup 4/ A/cm/sup 2/ at 16 T were obtained.
- Research Organization:
- Institut fur Metallphysik, Hospitalstrasse 3-7, Univ. Gottingen, 3400 Gottingen (DE)
- OSTI ID:
- 6090139
- Report Number(s):
- CONF-880812-
- Journal Information:
- IEEE Trans. Magn.; (United States), Journal Name: IEEE Trans. Magn.; (United States) Vol. 25:2; ISSN IEMGA
- Country of Publication:
- United States
- Language:
- English
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
ALUMINIUM ALLOYS
BISMUTH ALLOYS
CARBON DIOXIDE LASERS
COMPOSITE MATERIALS
CRITICAL TEMPERATURE
CRYSTAL STRUCTURE
CURRENT DENSITY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ELEMENTS
FABRICATION
GAS LASERS
IRRADIATION
LASER RADIATION
LASERS
MATERIALS
MICROSTRUCTURE
NIOBIUM ALLOYS
PHYSICAL PROPERTIES
POWDERS
RADIATIONS
SEMIMETALS
SILICON
SINTERING
STOICHIOMETRY
SUPERCONDUCTING COMPOSITES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE