Phlegmatized metal or alloy powder and method and/or...

B - Operations – Transporting – 22 – F

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B22F 9/20 (2006.01) B22F 1/00 (2006.01) C22B 5/04 (2006.01) C22B 34/10 (2006.01) C22B 34/12 (2006.01) C22B 34/14 (2006.01)

Patent

CA 2712929

A method and a device are described for the production of metal powder or alloy powder of a moderate grain sizes less than 10 µm, comprising or containing at least one of the reactive metals zirconium, titanium, or hafnium, by metallothermic reduction of oxides or halogenides of the cited reactive metals with the aid of a reducing metal, wherein said metal powder or alloy powder is phlegmatized by adding a passivating gas or gas mixture during and/or after the reduction of the oxides or halogenides and/or is phlegmatized by adding a passivating solid before the reduction of the oxides or halogenides, wherein both said reduction and also said phlegmatization are performed in a single gas-tight reaction vessel which can be evacuated.

L'invention concerne un procédé et un dispositif pour produire une poudre métallique ou une poudre d'alliage présentant une granulométrie moyenne inférieure à 10 µm, composée de ou contenant au moins un métal hautement réactif parmi le zirconium, le titane ou l'hafnium, par réduction métallothermique d'oxydes ou d'halogénures desdits métaux hautement réactifs à l'aide d'un métal réducteur, la poudre métallique ou la poudre d'alliage étant stabilisée par addition d'un gaz ou d'un mélange gazeux à effet passivant pendant et/ou après la réduction des oxydes ou des halogénures et/ou par addition d'un solide à effet passivant avant la réduction des oxydes ou des halogénures, la réduction et la stabilisation étant toutes deux réalisées dans une seule cuve de réaction étanche aux gaz et pouvant être mise sous vide.

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