Process for producing metal powders

Details Process for producing metal powders Process for producing metal powders

B - Operations, Transporting

22

F

B22F 9/28 (2006.01) C22B 5/20 (2006.01)

Patent

CA 2578876

A process for the production of extra fine spherical metal powders by chemical vapor deposition and dissolution techniques, including metal carbonyls, wherein the metal containing process gas is propelled upwardly through a heated reactor. By employing an upward gas flow as opposed to the conventional downward gas flow, a closer approximation of theoretical plug-flow velocity profiles are achieved thusly resulting in a desirably narrower size particle distribution obviating or reducing the need for subsequent classification techniques.

L'invention a trait à un procédé de production de poudres métalliques sphériques extra-fines par des techniques de dissolution et de dépôt chimique en phase vapeur, comprenant des carbonyles métalliques, le métal contenant un gaz de traitement étant propulsé vers le haut par un réacteur chauffé. En employant un flux de gaz montant, par opposition au flux de gaz descendant conventionnel, on obtient une meilleure approximation des profils de vitesse d'écoulement sub-laminaire théorique, ce qui entraîne une distribution de particules de taille de préférence plus étroite, limitant ou réduisant le besoin de techniques de classification ultérieures.

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