Patent · US Active

Method for the production of niobium and tantalum powder

US7824463B2 · kind B2 · utility

2Cited by

3References

11Claims

0Family size

Assignee

H.C. STARCK INC. · US

Inventors

Helmut Haas · Achim, DE
Ulrich Bartmann · Goslar, DE
Tadashi Komeya · Ise, JP
Nobuyuki Sato · Chiba, JP

Key dates

Filing date	Apr 9, 2005
Grant date	Nov 2, 2010
Priority date	—
Expiry date	Feb 6, 2027

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB22F2301/20
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

Process for the production of valve metal powders, in particular niobium and tantalum powder, by reduction of corresponding valve metal oxide powders by means of vaporous reducing metals and/or hydrides thereof, preferably in the presence of an inert carrier gas, wherein the reduction is performed at a vapor partial pressure of the reducing metal/metal hydride of 5 to 110 hPa and an overall pressure of less than 1000 hPa, and tantalum powder obtainable in this way having a high stability of the powder agglomerate particles.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.