Magnesium removal from magnesium reduced metal powders
AssigneeH.C. Starck GmbH
InventorsLeonid Shekhter, Leonid Lanin, Anastasis Conlon
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Abstract
A method of producing a refractory metal powder that includes providing a metal powder containing magnesium tantalate or magnesium niobate; and heating the powder in an inert atmosphere in the presence of magnesium, calcium and/or aluminum to a temperature sufficient to remove magnesium tantalate or magnesium niobate from the powder and/or heating the powder under vacuum to a temperature sufficient to remove magnesium tantalate or magnesium niobate from the powder, the heating steps being performed in any order. The metal powder can be formed into pellets at an appropriate sintering temperature, which can be formed into electrolytic capacitors.
Claims23
A method of producing a refractory metal powder comprising:
- (A) providing a metal powder containing magnesium tantalate or magnesium niobate;
- and
- (B) heating the powder in an inert atmosphere in the presence of a reducing agent to a temperature sufficient to remove magnesium tantalate or magnesium niobate from the powder (reduction step) and/or heating the powder under vacuum to a temperature sufficient to remove magnesium tantalate or magnesium niobate from the powder (heating under vacuum step), the reduction step and heating under vacuum step can be performed in any order.
Dependencies are inferred from the claim text.