Process for preparing metal powders having low oxygen...

B - Operations – Transporting – 22 – F

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B22F 1/00 (2006.01)

Patent

CA 2664334

The present invention is directed to a process for the preparation of a metal powder having a purity at least as high as the starting powder and having an oxygen content of 10 ppm or less comprising heating said metal powder containing oxygen in the form of an oxide, with the total oxygen content being from 50 to 3000 ppmf in an inert atmosphere at a pressure of from 1 bar to 10-7 to a temperature at which the oxide of the metal powder becomes thermodynamically unstable and removing the resulting oxygen via volatilization. The metal powder is preferably selected from the group consisting of tantalum, niobium, molybdenum, hafnium, zirconium, titanium, vanadium, rhenium and tungsten. The invention also relates to the powders produced by the process and the use of such powders in a cold spray process.

La présente invention concerne un procédé de préparation d'une poudre métallique ayant une pureté au moins aussi élevée que la poudre de départ et ayant une teneur en oxygène inférieure ou égale à 10 ppm comprenant le chauffage de ladite poudre métallique contenant de l'oxygène sous la forme d'un oxyde, la teneur totale en oxygène étant de 50 à 3000 ppm sous une atmosphère inerte à une pression de 1 à 10-7 bar à une température à laquelle l'oxyde de la poudre métallique devient thermodynamiquement instable et l'élimination de l'oxygène résultant par l'intermédiaire d'une volatilisation. La poudre métallique est de préférence choisie dans le groupe constitué par le tantale, le niobium, le molybdène, l'hafnium, le zirconium, le titane, le vanadium, le rhénium et le tungstène. L'invention concerne également des poudres produites au moyen du procédé et l'utilisation de ces poudres dans un procédé de pulvérisation à froid.

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