Abrégé

The invention relates to an electrode in which the metallurgical structure of the active surface comprises incoherent chromium precipitates, more than 90% of which have a surface of projection of less than 1 µm2, the incoherent chromium precipitates having a size at least between 10 and 50 nm. The disclosed electrode further has a fibrous structure that is visible in a cross-section of the active surface of the electrode following surfacing and chemical etching, said fibrous structure consisting of a plurality of radial fibers having a thickness of less than 1 mm and of a substantially central fiberless region that has a diameter of less than 3 mm, the electrical conductivity of the electrode being greater than 85% IUPAC. The invention also relates to a method for obtaining said electrode in a continuous casting process as well as to a use of the electrode in a resistive spot welding process.

Classes IPC  ?

• B23K 35/30 - Emploi de matériaux spécifiés pour le soudage ou le brasage dont le principal constituant fond à moins de 1550 C
• B22D 11/00 - Coulée continue des métaux, c.-à-d. en longueur indéfinie
• B23K 35/40 - Fabrication de fils ou de barres pour le brasage ou le soudage
• B23K 35/02 - Baguettes, électrodes, matériaux ou environnements utilisés pour le brasage, le soudage ou le découpage caractérisés par des propriétés mécaniques, p. ex. par la forme
• C22C 9/00 - Alliages à base de cuivre

Abrégé

The invention relates to a method for preparing a part made of copper, a copper alloy containing at least 60 wt.% copper relative to the total weight of the alloy, nickel, or a nickel alloy and coating said alloy part with at least one transparent layer having a thickness between 1 and 10 μm so as to protect said layer from chemical and/or mechanical stress. In said method, according to the steps for developing producing the alloy or metal in the foundry and for manufacturing the part, preparation of the surface of the part is carried out before applying, ontoat said surface, at least one main controlled-thickness layer of a sol-gel coating onto said part. Said coating is obtained from a sol comprising two precursors: ASB/GPTMS (aluminum tri-sec butoxide / 3-glycidyloxypropyltrimethoxysilane). A specific heat treatment is then carried out so as to enable densification of the coating. The parts covered by said coating have particularly attractive visual qualities and improved resistance to outer external stress.

Classes IPC  ?

• C23C 18/12 - Revêtement chimique par décomposition soit de composés liquides, soit de solutions des composés constituant le revêtement, ne laissant pas de produits de réaction du matériau de la surface dans le revêtementDépôt par contact par décomposition thermique caractérisée par le dépôt sur des matériaux inorganiques, autres que des matériaux métalliques
• A45C 1/00 - Porte-monnaieSacochesPortefeuilles
• C09D 183/04 - Polysiloxanes
• C22F 1/08 - Modification de la structure physique des métaux ou alliages non ferreux par traitement thermique ou par travail à chaud ou à froid du cuivre ou de ses alliages
• C23G 1/20 - Autres métaux lourds
• C23G 5/032 - Nettoyage ou dégraissage des matériaux métalliques par d'autres méthodesAppareils pour le nettoyage ou le dégraissage de matériaux métalliques au moyen de solvants organiques au moyen de solvants organiques contenant des composés comportant de l'oxygène

Abrégé

The invention relates to a crucible (7) for a machine (1) for continuously casting a bar or coil of a metal alloy, including a casting chamber (2), a primary supply chamber (4) for supplying a molten metal alloy and a transfer channel (6) for transferring said molten metal alloy to the casting chamber (2). Said crucible (7) includes in addition a secondary supply chamber (5) connected to the primary supply chamber (4) through an interior opening (21) arranged at the lower level of said primary supply chamber (4), and configured so that, in operation, the separation is complete at the level of the surface of said molten metal alloy in the primary supply chamber (4). The invention also relates to a machine (1) for continuously casting with a crucible (7) according to the invention, and a method for manufacturing a bar or a coil of a metal alloy by means of a machine (1) for continuously casting according to the invention.

Classes IPC  ?

• B22D 11/00 - Coulée continue des métaux, c.-à-d. en longueur indéfinie
• B22D 11/041 - Coulée continue des métaux, c.-à-d. en longueur indéfinie dans des moules sans fond pour la coulée verticale
• B22D 11/10 - Alimentation en métal liquide ou traitement du métal liquide