Flake tantalum powder for manufacturing electrolytic capacitors

The FTP200 flake tantalum powder was introduced. The microstructures of the powder with leaf-like primary particles having an average flakiness of 2 to 20 and porous agglomerated particles were observed. The chemical composition, physical properties, and electrical properties of the FTP200 powder were compared with those of the FTW300 nodular powder. The FTP200 powder is more sinter-resistant, and the surface area of the flake tantalum powder under sintering at high temperature has less loss than that of the nodular tantalum powder. The specific capacitance of the flake tantalum powder is higher than that of the nodular tantalum powder with the same surface area when anodized at high voltage. Thus, the flake tantalum powder is suitable for manufacturing tantalum solid electrolytic capacitors in the range of median and high (20-63 V) voltages.