B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 2/04 (2006.01)
Patent
CA 2551020
The invention concerns a process for the spheroidisation, densification and purification of powders through the combined action of plasma processing, and ultra-sound treatment of the plasma-processed powder. The ultra-sound treatment allows for the separation of the nanosized condensed powder, referred to as 'soot', from the plasma melted and partially vaporized powder. The process can also be used for the synthesis of nanopowders through the partial vaporization of the feed material, followed by the rapid condensation of the formed vapour cloud giving rise to the formation of a fine aerosol of nanopowder. In the latter case, the ultrasound treatment step serves for the separation of the formed nanopowder form the partially vaporized feed material.
La présente invention concerne un procédé de sphéroidisation, de densification et de purification de poudres par l'action combinée du traitement au plasma et du traitement aux ultrasons de la poudre traitée au plasma. Le traitement aux ultrasons permet de séparer la poudre condensée de taille nanométrique, désignée par <= suie >=, de la poudre fondue sous l'effet du plasma et partiellement vaporisée. Le procédé de l'invention peut également être utilisé pour la synthèse de nanopoudres via la vaporisation partielle de la matière d'alimentation, suivie par la condensation rapide du nuage de vapeur formé qui donne lieu à la formation d'un fin aérosol de nanopoudre. Dans ce dernier cas, l'étape de traitement aux ultrasons sert à séparer la nanopoudre formée de la matière d'alimentation partiellement vaporisée.
Boulos Maher I.
Jurewicz Jerzy
Nessim Christine
Normand Christian
Bcf Llp
Tekna Plasma Systems Inc.
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