Features of Segregation of the Oxide Phase during Sintering of Tantalum Powders with a Large Specific Surface

The effect of the oxygen content in tantalum powders of different natures on the leakage currents of capacitor anodes has been examined. It has been established that the leakage current in the anodes from magnesium thermal powders with a highly developed surface depends on the oxygen content in them more weakly than in anodes from powders consisting of fragmented particles, which have a smaller surface area. This is explained by the fact that, during sintering of the anodes from powders with a large specific surface, the majority of the oxygen of the natural oxide interacts with the metal with the formation of Ta2O5 particles outside the tantalum particle volume.