Process for the production of ultrafine particles

Details Process for the production of ultrafine particles Process for the production of ultrafine particles

B - Operations, Transporting

22

F

B22F 9/16 (2006.01) B22F 9/00 (2006.01) B22F 9/04 (2006.01) B22F 9/20 (2006.01) C01F 7/02 (2006.01) C01F 17/00 (2006.01) C01G 9/08 (2006.01) C01G 25/02 (2006.01) C01G 49/06 (2006.01) C04B 35/622 (2006.01) C04B 35/626 (2006.01) C22B 5/02 (2006.01) C22B 61/00 (2006.01) C22C 1/00 (2006.01)

Patent

CA 2230443

A new, cost effective process for the production of ultrafine particles which is based on mechanically activated chemical reaction of a metal compound with a suitable reagent. The process involves subjecting a mixture of a metal compound and a suitable reagent to mechanical activation to increase the chemical reactivity of the reactants and/or reaction kinetics such that a chemical reaction can occur which produces a solid nano-phase substance. Concomitantly, a by-product phase is also formed. This by-product phase is removed so that the solid nano-phase substance is left behind in the form of ultrafine particles. During mechanical activation a composite structure is formed which consists of an intimate mixture of nano-sized grains of the nano- phase substance and the reaction by-product phase. The step of removing the by-product phase, following mechanical activation, may involve subjecting the composite structure to a suitable solvent which dissolves the by-product phase, while not reacting with the solid nano- phase substance. The process according to the invention may be used to form ultrafine metal powders as well as ultrafine ceramic powders. Advantages of the process include a significant degree of control over the size and size distribution of the ultrafine particles, and over the nature of interfaces created between the solid nano-phase substance and the reaction by-product phase.

L'invention porte sur un procédé nouveau et économique de production de particules ultrafines utilisant la réaction, activée mécaniquement, d'un composé métallique et d'un réactif adéquat. Ledit procédé consiste à soumettre le mélange du composé métallique et du réactif adéquat à une activation mécanique qui augmente la réactivité chimique du réactif et/ou la cinétique de la réaction, et permet d'obtenir une substance en nanophase solide. La phase de sous-produit formée concomitamment est éliminée, et il reste une substance en nanophase solide sous forme de particules ultrafines. Pendant l'activation mécanique, il se forme une structure composite consistant en un mélange intime des nanoparticules de la nanophase de la substance et de la phase du sous produit de réaction. L'élimination de la phase de sous-produit qui suit l'activation mécanique peut consister à placer la structure composite dans un solvant adéquat qui dissout la phase du sous-produit sans réagir avec la substance en nanophase. Le procédé objet de l'invention qui peut servir à la production de poudres métalliques ou céramiques ultrafines a l'avantage de permettre d'influer dans une certaine mesure sur la taille et la distribution granulométrique des particules ultrafines et sur la nature des interfaces créées entre la substance en nanophase solide et la phase du sous produit de réaction.

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