Metallurgical powder composition and method of production

C - Chemistry – Metallurgy – 22 – C

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Details

C22C 33/02 (2006.01)

Patent

CA 2700056

The present invention relates to an annealed pre-alloyed water atomised iron- based powder suitable for the production of pressed and sintered components having high wear resistance. The iron-based powder comprises 10- below 18% by weight of Cr, 0.5-5% by weight of each of at least one of Mo, W, V and Nb and 0.5-2%, preferably 0.7-2% and most preferably 1 -2% by weight of C. The powder has a matrix comprising less than 10% by weight of Cr, and comprises large M23C6-type carbides in combination with M7C3-type carbides. The invention also relates to a method for production of the iron-based powder as well as a method for producing a pressed and sintered component having high wear resistance and the component having high wear resistance.

La présente invention concerne une poudre recuite et pré-alliée à base de fer atomisée dans l'eau apte à la production de composants pressés et frittés présentant une résistance élevée à l'usure. La poudre à base de fer comporte entre 10 et moins de 18% en poids de Cr, 0,5 à 5% en poids de chacun d'au moins d'un élément parmi Mo, W, V et Nb et 0,5 à 2%, de préférence 0,7 à 2% et avantageusement 1 à 2% en poids de C. La poudre comprend une matrice comportant moins de 10% en poids de Cr, et comporte des carbures de type M23C6 de grande taille en combinaison avec des carbures de type M7C3. L'invention concerne également un procédé de production de poudre à base de fer ainsi qu'un procédé de production d'un composant pressé et fritté présentant une résistance élevée à l'usure et le composant présentant une résistance élevée à l'usure.

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