Tantalum powder
AssigneeCabot Corporation
InventorsJames A. Fife, Marlyn F. Getz
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Abstract
An improved flaked tantalum powder and process for making the flaked powder are disclosed. The powder is characterized by having a Scott density greater than about 18 g/in.sup.3 and preferably at least about 90% of the flake particles having no dimension greater than about 55 micrometers. Agglomerates of the flaked tantalum powder, provide improved flowability, green strength and presssing characteristics compared to conventional flaked tantalum powders. The improved flaked tantalum powder can be made by preparing a flaked tantalum and then reducing the flake size until a Scott density greater than about 18 g/in.sup.3 is achieved. The invention also provides pellets and capacitors prepared from the above-described flaked tantalum powder.
Claims28
A flaked tantalum powder produced from a tantalum powder prepared by a chemical reduction process comprised of flakes and having a Scott density greater than about 18 g/in.sup.3.
A flaked tantalum powder produced from a tantalum powder prepared by a chemical reduction process comprised of flakes and having a Scott density in the range of about 18 g/in.sup.3 to about 60 g/in.sup.3.
A flaked tantalum powder produced from a tantalum powder prepared by a chemical reduction process comprised of flakes and having a Scott density in the range of about 20 g/in.sup.3 to about 35 g/in.sup.3.
A flaked tantalum powder produced from a tantalum powder prepared by a chemical reduction process comprised of flakes and having a Scott density of about 21 g/in.sup.3.
The flaked tantalum powder of claim, 1, 2, 3 or 4, wherein at least about 90% of the flakes have no dimension greater than about 55 micrometers.
A flaked tantalum powder comprised of flakes, having a Scott density greater than about 18 g/in.sup.3 and a BET surface area value in the range of about 0.4 m.sup.2 /g to 0.6 m.sup.2 /g.
Dependencies are inferred from the claim text.