PLASMA SYNTHESIS OF NANOPOWDERS

• Main Authors: JUREWICZ, JERZY, GUO, JIAYIN, BOULOS, MAHER I, FAN, XIAOBAO, DIGNARD, NICOLAS
• Format: Patent
• Language: English; French
• Published: 26.06.2012
• Subjects: CASTING; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PLASMA TECHNIQUE; POWDER METALLURGY; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OFNEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMICBEAMS; THEIR RELEVANT APPARATUS; TRANSPORTING; WORKING METALLIC POWDER

A process and apparatus for preparing a nanopowder are presented. The process comprises feeding a reactant material into a plasma reactor in which is generated a plasma flow having a temperature sufficiently high to vaporize the material; transporting the vapour by means of the plasma flow into a quenching zone; injecting a preheated quench gas into the plasma flow in the quenching zone to form a renewable gaseous condensation front; and forming a nanopowder at the interface between the renewable controlled temperature gaseous condensation front and the plasma flow. Divulgation d'un procédé et d'un appareil pour préparer une nanopoudre. Ce procédé comprend : l'alimentation en matière réactive d'un réacteur à plasma dans lequel est produit un flux de plasma ayant une température suffisante pour vaporiser la matière; le transport de la vapeur au moyen du plasma dans une zone de piégeage; l'injection d'un gas de piégeage préchauffé dans le flux de plasma dans la zone de piégeage pour former un front de condensation gazeux renouvelable; la formation d'une nanopoudre à l'interface entre le front de condensation et le flux de plasma.