Dynamic dehydriding of refractory metal powders

Details Dynamic dehydriding of refractory metal powders Dynamic dehydriding of refractory metal powders

B - Operations, Transporting

22

F

B22F 9/20 (2006.01) C23C 24/00 (2006.01)

Patent

CA 2736876

Refractory metal powders are dehydrided in a device which includes a preheat chamber for retaining the metal powder fully heated in a hot zone to allow diffusion of hydrogen out of the powder. The powder is cooled in a cooling chamber for a residence time sufficiently short to prevent re-absorbtion of the hydrogen by the powder. The powder is consolidated by impact on a substrate at the exit of the cooling chamber to build a deposit in solid dense form on the substrate.

La présente invention concerne la déshydruration de poudres métalliques réfractaires dans un appareil qui comprend une chambre de préchauffage conçue pour contenir la poudre métallique entièrement chauffée dans une zone chaude afin de permettre la diffusion de l'hydrogène hors de la poudre. La poudre est refroidie dans une chambre de refroidissement pendant un temps de séjour suffisamment court pour empêcher la réabsorption de lhydrogène par la poudre. La poudre est agglomérée par impact sur un substrat à la sortie de la chambre de refroidissement afin de constituer un dépôt épais et solide sur le substrat.

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