Zirconium-niobium oxygen-containing alloy and method for...

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 16/00 (2006.01) C22C 1/03 (2006.01)

Patent

CA 2536742

The invention relates to zirconium and niobium-based alloys and to methods for the production thereof and can be used for nuclear energy engineering. Said invention makes it possible to produce a zirconium-based alloy for producing elements exhibiting improved technological and performance characteristics and used for the active zone of a nuclear reactor. The inventive zirconium-based alloy comprises the following components: 0.9-1.1 mass % niobium, 0.05-0.09 mass % oxygen, the rest being zirconium. The structure of said alloy consists of alpha-zirconium having oxygen inhomogeneity zones equal to or less than 30 nm, nonstoichiometric zirconium suboxyde and beta-niobium. The inventive method for producing said alloy consists in producing a mixture from zirconium- containing material and niobium pentaoxlde in the form of oxygen-containing and basic niobium-containing material, preparing said mixture for melting, melting the mixture and in forming a billet.

L'invention a trait à des alliages à base de zirconium, et à des procédés de production desdits alliages, et peut être appliquée à l'industrie nucléaire. L'invention permet d'obtenir un alliage à base de zirconium destiné à la préparation d'éléments du coeur d'un réacteur nucléaire, ledit alliage présentant des propriétés techniques et opératoires améliorées. L'alliage à base de zirconium contient de 0,9 à 1,1 % poids de niobium, de 0,05 à 0,09 % poids d'oxygène, le solde étant du zirconium. Ledit alliage est constitué de zirconium alpha présentant des zones discontinues d'oxygène d'une taille ne dépassant pas 30 nm, de sous-oxyde de zirconium non stoechiométrique et de niobium bêta. L'invention concerne également un procédé de production dudit alliage, qui consiste à obtenir une charge à partir d'une matière contenant du zirconium et de pentoxyde de niobium, lequel sert de matière contenant de l'oxygène et de matière principale contenant du niobium, à préparer la charge pour la fusion, à fondre l'alliage et à obtenir un lingot.

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