Edison S.p.a.

Edison Termoelettrica, S.p.a.

La Metalli Industriale S.p.a.

Sergio Ceresara

Giovanni Giunchi

Mario Brogi

A method is described for the preparation of superconductor massive bodies of MgB, having a density close to the theorical value, which comprises the following passages: mechanical activation of crystalline boron with the formation of activated powders; formation of a porous preform of said powders; assembly of the porous boron preform and massive precursors of metallic magnesium in a container and sealing thereof in an atmosphere of inert gas or with a low oxygen content; thermal treatment of the boron and magnesium as assembled above, at a temperature higher than 700&#xb0; C. for a time greater than 30 minutes, with the consequent percolation of the magnesium, in liquid phase, through the activated crystalline boron powders.

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A method is described for the production of superconductive wires based on hollow filaments made of MgB, 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&#xb0; C. to 950&#xb0; C. for a time ranging from 15 minutes to three hours.

Method for the production of superconductive wires based on hollow filaments made of MgB2

A description follows of an article based on a nickel-chromium-silicon metal alloy, including microcrystalline borides, obtained by the rapid solidification and subsequent thermal treatment of a nickel-chromium-boron-silicon metal alloy comprising from 39.0 to 69.4 atom % of nickel, from 11.8 to 33.9 atom % of chromium, from 7.6 to 27.4 atom % of boron and from 7.6 to 17.5 atom % of silicon. The above article is preferably a tape or a sheet or a fiber having high mechanical properties and is particularly resistant to oxidation.

Article based on a metal alloy of nickel, chromium and metalloid elements including microcrystalline precipitates, metal alloy and preparation method

A process is described for the production of superconducting conductors of the type comprising a plurality of filaments of an alloy containing niobium and titanium as base materials and a composite matrix of copper, aluminium or alloys of these elements, in which the filaments are disposed, and which serves to stabilize the superconductor; the process includes at least a first phase of preparing a first superconducting conductor comprising:

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Lucca, Italy

Sergio Ceresara