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Comparison of Al5-Nb3Al superconductors produced by laser alloying and infiltration

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4 Author(s)
Schaper, W. ; Inst. fuer Metallphys., Gottingen Univ., West Germany ; Kehlenbeck, M. ; Zimmermann, I. ; Freyhardt, H.C.

Nb3(Al, Si, Bi) and Nb3Al superconductors were successfully prepared by a laser alloying and an infiltration process. Continuous CO2 laser irradiation of Nb-sheathed Nb-25-at.% Al composite tapes prepared by a conventional powder metallurgical method was carried out. For a laser power of less than 3.5 kW and specimen velocities up to 30 m/min, almost stoichiometric Nb3Al with critical temperatures of 16.6 K and critical current densities of 104 A/cm2 at 15 T was obtained. For infiltration, sintered Nb powder was immersed in a liquid (Al88.7Si11.3)99Bi1 alloy. Subsequently the infiltrated rod was deformed and reacted at temperatures up to 2000°C. The microstructure and the superconducting properties have been studied as a function of the degree of deformation and the reaction temperature. Critical temperatures between 14 and 18 K, upper critical fields Bc2 of 21 T and critical current densities of 104 A/cm2 at 16 T were obtained

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Magnetics, IEEE Transactions on  (Volume:25 ,  Issue: 2 )