Powder-metallurgic method for the production of highly dense...

C - Chemistry – Metallurgy – 22 – C

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C22C 1/04 (2006.01) B22F 1/00 (2006.01) C22C 27/06 (2006.01) C22C 33/02 (2006.01) C22C 38/18 (2006.01) H01M 8/02 (2006.01)

Patent

CA 2402515

The invention concerns a powder metallurgic method for the production of highly dense shaped parts of an alloy that, besides of at least 20 weight% chromium, consists of iron as well as of one or several additional alloy portions that in sum do not amount 10 weight%. According to the invention, the production takes place by pressing and sintering near to the final shape a ready to press powder, the additional alloy portions being introduced in form of a master-alloy powder. In doing so, the master-alloy alternatively consists alternatively of the additional alloy portions and the iron portions or the additional alloy portions, the iron parts and the chromium portions or the additional alloy portions and the chromium portions.

L'invention concerne un procédé mettant en oeuvre la métallurgie des poudres en vue de la production de pièces façonnées de haute densité en un alliage qui est constitué, hormis au moins 20 % en poids de chrome, par du fer, ainsi que par un ou plusieurs constituants d'alliages supplémentaires ne dépassant pas plus de 10 % en poids au total. L'invention est caractérisée en ce que la fabrication s'effectue par pressage et frittage d'une charge de poudre, en vue de l'obtention de pièces voisines de pièces finies, et en ce que les constituants d'alliages supplémentaires sont introduits sous la forme d'un pré-alliage, celui-ci renfermant, selon les nécessités, des constituants d'alliages supplémentaires et les pourcentages de fer, ou bien des constituants d'alliages supplémentaires, les pourcentages de fer et les pourcentages de chrome, ou encore, des constituants d'alliages supplémentaires et les pourcentages de chrome.

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