Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2005-10-25
2005-10-25
Arbes, Carl J. (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C505S230000, C505S232000, C505S704000
Reexamination Certificate
active
06957480
ABSTRACT:
A method is described for the production of superconductive wires based on hollow filaments made of MgB2, which comprises: a) the formation of a composite billet by means of the coaxial insertion in a tubular metallic container of a cylindrical bar made of metallic magnesium and amorphous boron powder in the interspace between the container and bar, said powder being pressed between the metallic container and the magnesium bar, in such a quantity that the weight ratio magnesium/boron is higher than 1.2; b) at least one plastic deformation treatment of the composite billet thus obtained until a wire with a pre-fixed diameter is obtained, with the subsequent winding of the wire onto a support; c) a thermal treatment of the filament product thus obtained, at a temperature ranging from 700° C. to 950° C. for a time ranging from 15 minutes to three hours.
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Supertcvonductor in Dense MgB2 Wires, by P.C. Canfield et al , Phys Rev Letters, vol. 86, No. 11, pp 2423-26, , Mar. 2001.
Ceresara Sergio
Giunchi Giovanni
Arbes Carl J.
Edison S.p.A..
Hedman & Costigan P.C
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