(Nb,Ta,Ti) sub(3)Sn multifilamentary wires using Osprey bronze with high tin content and NbTa/NbTi composite filaments

Several (Nb,Ta,Ti) sub(3)Sn multifilamentary wires with different Ti contents (up to 0.6 wt.%), but identical configuration have been processed using the bronze route and NbTa/NbTi composite filaments. The wires were manufactured by a sequence of three extrusion steps using a Cu 15.4 Sn Osprey bronz...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2002-08, Vol.372-376, p.1325-1328
Main Authors: Uglietti, D, Seeber, B, Flukiger, R, Abacherli, Vital
Format: Article
Language:English
Online Access:Get full text
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Summary:Several (Nb,Ta,Ti) sub(3)Sn multifilamentary wires with different Ti contents (up to 0.6 wt.%), but identical configuration have been processed using the bronze route and NbTa/NbTi composite filaments. The wires were manufactured by a sequence of three extrusion steps using a Cu 15.4 Sn Osprey bronze as matrix. The wires of 1.06 mm diameter with 14641 filaments of 4.4 mu m size were reacted by various heat treatments, ranging from 600 to 730 degree C. Critical current density (J sub(c)) measurements on samples in a coil geometry have been performed up to 17 T at 4.2 K, yielding to 195 A mm super(-2) at 17 T. Upper critical magnetic fields (B sub(c2)) up to 28.2 T were estimated by Kramer extrapolation. The variation of the critical temperature (T sub(c)) as well as of the n factor were determined. The effect of various Ti contents was analyzed with respect to the various superconducting parameters, especially in view of applications at fields > 20 T. copyright 2002 Elsevier Science B.V. All rights reserved.
ISSN:0921-4534