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US 10,943,744 B2Granted
Anodes containing spherical powder and capacitors
AssigneeGlobal Advanced Metals USA, Inc.
InventorsCraig M. Sungail, Aamir Dawood Abid
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Abstract
Anodes made from powder, such as tantalum powder, that is highly spherical is described. Methods to make the anodes are further described.
Claims32
A capacitor anode comprising a powder that is pressed and sintered, wherein said powder comprises a spherical powder that is a metal or metal sub-oxide or both, said spherical powder comprising
- a. a spherical shape wherein the powder has an average aspect ratio of from 1.0 to 1.4;
- b. a purity of at least 99.5 wt %;
- c. an average particle size of from about 0.5 micron to about 250 microns;
- d. an apparent density from about 1.5 g/cc to about 15.5 g/cc;
- e. a true density that is within +−3% of the metal or metal sub-oxide;
- and
- f. a Hall flow rate of 40 sec or less.
4 more elements
A metal or metal sub-oxide powder comprising
- a. a spherical shape wherein the powder has an average aspect ratio of from 1.0 to 1.4;
- b. a purity of at least 99.5 wt % based on total weight of said powder, excluding gas impurities;
- c. an average particle size of from about 0.5 micron to about 250 microns;
- d. an apparent density from about 1.5 g/cc to about 15.5 g/cc;
- e. a true density that is within +−3% of the metal or metal sub-oxide;
- and
- f. a Hall flow rate of 40 sec or less.
4 more elements
Dependencies are inferred from the claim text.