Tantalum powder, method for producing same powder and sintered anodes obtained from it
AssigneeH. C. Starck GmbH
InventorsKarlheinz Reichert, Rüdiger Wolf, Christine Rawohl
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Abstract
The invention relates a tantalum powder free of alkali and fluorine, which for a relatively small primary particle size has comparatively large secondary particles and is suitable for producing capacitors with a specific charge of between 100,000 and 180,000 μFV/g at specific residual currents of less than 2nA/μFV.
Claims30
Tantalum powder which is free from alkali and fluorine, with a primary grain size of 50 to 300 nm and a D 50 value of the secondary grain size (ASTM-B-288) greater than 10 μm.
Tantalum powder, which after sintering at a temperature between 1100 and 1300° C. for 10 minutes and forming at 16 volts has a specific charge of 120,000 to 180,000 μFV/g at a leakage current of less than 2 nA/μFV.
Dependencies are inferred from the claim text.