Metal powders based on tungsten and/or molybdenum and...

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 1/04 (2006.01) B22F 1/00 (2006.01) B22F 9/02 (2006.01) B22F 9/20 (2006.01) C01G 39/00 (2006.01) C01G 41/00 (2006.01) C01G 49/00 (2006.01) C01G 51/00 (2006.01) C01G 53/00 (2006.01) C22C 9/00 (2006.01) C22C 27/06 (2006.01) C22C 30/02 (2006.01)

Patent

CA 2315346

The invention concerns a pre-alloyed metal powder consisting essentially of tungsten and/or molybdenum, at least one transition metal selected among iron, cobalt, nickel and copper, and optionally at least one additive, the iron content being less than 50 wt. % and the total additive content being less than 3 wt. %, relative to the total weight of metals, said pre-alloyed metal powder having elementary grain size measured with scanning electron microscope, greater than 200 nm and less than 5 micrometers. The invention also concerns a sintered part obtained with such a powder. The invention is particularly applicable for producing sintered parts to be used as electric contacts, heat sinks, spark machining electrodes, mechanical balance weights, inertial units, tool-holders, anti-radiation screen, armament components, sintered steel or diamond charged cutting or grinding tools or with titanium carbide.

Poudre métallique préalliée constituée essentiellement de tungstène et/ou de molybdène, d'au moins un métal de transition choisi parmi le fer, le cobalt, le nickel et le cuivre, et éventuellement d'au moins un additif, la teneur en fer étant inférieure à 50 % en poids et la teneur totale en additifs étant inférieure à 3 % en poids, par rapport au poids total des métaux, ladite poudre métallique préalliée ayant des dimensions de grains élémentaires, mesurées au microscope électronique à balayage, supérieures à 200 nm et inférieures à 5 micromètres; et pièce frittée obtenue à l'aide d'une telle poudre. Application notamment à la réalisation de pièces frittées utilisables comme contacts électriques, puits thermiques, électrodes d'électro-érosion, masses d'équilibrage mécanique, centrales inertielles, porte-outils, écrans anti-rayonnement, pièces d'armement, aciers frittés ou outils de coupe ou d'abrasion diamantés ou au carbure de titane.

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