H - Electricity – 01 – L
Patent
H - Electricity
01
L
H01L 39/24 (2006.01)
Patent
CA 2255607
The present invention provides a (Bi,Pb)SCCO-2223 oxide superconductor composite which exhibits improved critical current density and critical current density retention in the presence of magnetic fields. Retention of critical current density in 0.1 T fields (77K,1 ab plane) of greater than 35 % is disclosed. Significant improvements in oxide superconductor wire current carrying capacity in a magnetic field are obtained by subjecting the oxide superconductor composite to a post-processing heat treatment which reduces the amount of lead in the (Bi,Pb)SCCO-2223 phase and forms a lead-rich non-superconducting phase. The heat treatment is carried out under conditions which localize the lead-rich phase at high energy sites in the composite.
L'invention concerne un composite supraconducteur à l'oxyde de (Bi, Pb)SCCO-2223 qui présente une densité de courant critique et une rétention de densité de courant critique accrues en présence de champs magnétiques. La rétention de la densité de courant critique dans des champs de 0,1 T (77 K, ORTHOGONAL plan ab) de okzs de 35 % est décrite. On obtient des améliorations significatives de la capacité conductrice du fil supraconducteur à l'oxyde dans un champ magnétique en soumettant le composite supraconducteur à l'oxyde à un post-traitement qui réduit la quantité de plomb dans la phase (Bi, Pb)SCCO-2223 et forme une phase riche en plomb non supraconductrice. Le traitement thermique s'effectue dans des conditions dans lesquelles la phase riche en plomb se situe dans des sites à forte énergie dans le composite.
Fleshler Steven
Li Qi
Michels William J.
Parrella Ronald D.
Riley Gilbert N. Jr.
American Superconductor Corporation
Smart & Biggar
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