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US 5,242,481 AGranted
Method of making powders and products of tantalum and niobium
AssigneeCabot Corporation
InventorPrabhat Kumar
Life of this patent
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Abstract
A powder of tantalum, niobium, or an alloy thereof, having an oxygen content less than about 300 ppm, and the production thereof without exposure to a temperature greater than about 0.7 T.sub.H. A powder metallurgy formed product of tantalum, niobium, or an alloy thereof, having an oxygen content less than about 300 ppm, and the production thereof without exposure to a temperature greater than about 0.7 T.sub.H.
Claims6
A process for producing a metal powder having an oxygen content of less than 300 parts per million comprising:
- blending an oxygen active metal powder with a starting metal powder selected from the group consisting of tantalum or niobium,
- said active metal having a higher affinity for oxygen than said starting metal,
- heating the blended powder to a temperature less than about 0.7 T.sub.H, depleting the oxygen present int he starting metal to less than 300 ppm, and
- removing the oxygen enriched active metal from the starting metal by evaporation and chemical leaching.
1 more element
Dependencies are inferred from the claim text.