Method for the preparation of highly densified...

Details Method for the preparation of highly densified... Method for the preparation of highly densified...

H - Electricity

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L

H01L 39/24 (2006.01) C04B 35/65 (2006.01) C04B 35/653 (2006.01)

Patent

CA 2445104

A method is described for the preparation of superconductor massive bodies of MgB2, 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 ~C for a time greater than 30 minutes, with the consequent percolation of the magnesium, in liquid phase, through the activated crystalline boron powders.

L'invention concerne la préparation de corps massifs superconducteurs en MgB¿2?, présentant une densité proche de la valeur théorique, consistant à: activer mécaniquement du bore cristallin pour former des poudres activées; former une préforme poreuse avec lesdites poudres; assembler la préforme poreuse de bore et des précurseurs massifs de magnésium métallique dans un contenant, et sceller cet assemblage dans une atmosphère constituée de gaz inerte, ou à faible teneur en oxygène; effectuer un traitement thermique du bore et du magnésium, assemblés selon la méthode décrite ci-dessus, à une température supérieure à 700· C pendant une durée supérieure à 30 minutes. Il en résulte la percolation du magnésium en phase liquide, par le biais des poudres activées de bore cristallin.

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