Manufacture of Sodium-Reduced Tantalum Powders with a Specific Capacity up to 100000 CV/g

摘要

The characteristics of the tantalum powders produced by sodium thermal reduction from salt melts based on potassium heptafluotantalate K_2TaF_7 with additions of oxygen-containing tantalum compounds and sodium chloride are studied. The oxygen sources in a melt during sodium thermal reduction are represented by oxyfiuoride compounds K_3TaOF_6, KTaOF_4, and K_2Ta_2O_3F_6. The produced tantalum powders can be used as initial materials for the production of capacitor powders with a capacity up to 100 000 μC/g.