| US 7,476,280 B2 | ||
| Method for producing a superconductive element | ||
| René Fluekiger, Plan-les-Ouates (Switzerland); Vital Abaecherli, Les Acacias (Switzerland); and Daniel Eckert, Bachenbuelach (Switzerland) | ||
| Assigned to Bruker Biospin AG, Faellenden (Switzerland) | ||
| Filed on Sep. 12, 2005, as Appl. No. 11/223,039. | ||
| Claims priority of application No. 04021983 (EP), filed on Sep. 16, 2004. | ||
| Prior Publication US 2007/0227623 A1, Oct. 04, 2007 | ||
| Int. Cl. H01L 39/24 (2006.01) | ||
| U.S. Cl. 148—98 [148/96; 29/599] | 17 Claims |
| 1. A method for producing a superconductive element or a multifilament wire, the method comprising the steps of:
a) preparing a composite having a bronze matrix containing Cu and Sn in which at least one elongated structure containing
Nb, a Nb alloy, or NbTa is embedded;
b) extruding the composite at a temperature between 300° C. and 750° C.;
c) elongating the composite in parallel to the elongated structure, including isothermic hot rolling at a temperature between
450° C. and 750° C.;
d) annealing the composite;
e) stacking a plurality of annealed elongated composites, following steps a) through d), into a composite bundle;
f) repeating steps a) through e) at least one time; and
g) elongating the composite bundle following step f) in a final elongating procedure, the final elongating procedure comprising
at least one intermediate annealing process in which the composite bundle is elongated to a final length, a superconductive
phase being obtained by a heat treatment including a solid state diffusion reaction.
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