Magnesiothermic Reduction of Mg4Ta2O9 in the Combustion Regime

Resumo

We have studied the magnesium reduction of the Mg₄Ta₂O₉ tantalate in the combustion regime and assessed the influence of starting mixture parameters on the combustion speed and temperature, the degree of reduction, and characteristics of the resultant tantalum powders. The use of Mg₄Ta₂O₉ as a precursor for the reduction process has made it possible to increase the degree of reduction and the specific surface area of tantalum powders. We have obtained powders with a specific surface area of up to 21 m²/g, which is a factor of 4–5 larger than in the case of the reduction of Ta₂O₅ under the same conditions.