Method and transferred arc plasma system for production of...

B - Operations – Transporting – 22 – F

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B22F 9/14 (2006.01) B01J 19/08 (2006.01) C04B 35/626 (2006.01)

Patent

CA 2340669

The present invention is concerned with a method for the production of fine and ultrafine powders of various materials such as metals, alloys, ceramics, composites etc., through a transferred arc plasma system. The method comprises vaporizing or decomposing the material in the plasma reactor, condensing the vapor in a quench tube comprising two sections, the first one for indirectly cooling or heating the vapor, and the second one for directly cooling the vapor. The powder is recovered in a conventional collection unit. The two step condensation in the quench tube allows a substantial control of powder properties like crystallinity, size distribution and mean particle size.

La présente invention concerne un procédé de production de poudres fines et ultra-fines de divers matériaux tels que des métaux, des alliages, des céramiques, des composites etc., par l'intermédiaire d'un système de plasma à arc transféré. Le procédé consiste à vaporiser ou à décomposer le matériau dans le réacteur à plasma, à condenser la vapeur dans un tube de refroidissement brusque comprenant deux parties, la première destinée à refroidir ou à chauffer indirectement la vapeur, et la seconde destinée à refroidir directement la vapeur. La poudre est récupérée dans une unité de collecte classique. La condensation en deux étapes dans le tube de refroidissement brusque permet une régulation substantielle des propriétés des poudres telles que la cristallinité, la répartition granulométrique et la grosseur moyenne des particules.

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