Dynamic dehydriding of refractory metal powders
AssigneeH.C. Starck GmbH
InventorsSteven A. Miller, Mark Gaydos, Leonid N. Shekhter, Gokce Gulsoy
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Abstract
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.
Claims23
A device for dehydriding metals powders comprising a hot zone to allow diffusion of hydrogen out of the powder, said hot zone communicating with a downstream orifice and a cooling chamber for preventing substantial re-absorbtion of the hydrogen by the powder, and a substrate downstream from said cooling chamber on which the powder may impact and build a dense deposit to dynamically dehydride the metal powders and consolidate the powders into a high density metal.
A process for dehydriding metal powders wherein the metal powder is dehydrided and deposited directly into a bulk solid form comprising disposing the powder in a hot zone, retaining the powder fully heated in the hot zone for a sufficient time to allow diffusion of hydrogen out of the powder, cooling the powder to a cooling chamber for a residence time sufficiently short to prevent substantial re-absorbtion of the hydrogen by the powder, and consolidating the powder by impact on a substrate to build a deposit in solid dense form on the substrate.
Dependencies are inferred from the claim text.