Abstract
The dependence of the specific surface area of a tantalum powder on the conditions of reduction of magnesium tantalates MgTa2O6 and Mg4Ta2O9 by magnesium vapors is studied. This factor is shown to increase the powder specific surface area by several times. The powders have a nanoporous structure. Tantalum powders with a specific surface area of 65 m2/g (calculated particle size of 6 nm) are synthesized during the reduction of Mg4Ta2O9, and the main part of the surface is formed by mesopores <10 nm in diameter.
Similar content being viewed by others
References
M. I. Alymov, Powder Metallurgy of Nanocrystalline Materials (Nauka, Moscow, 2007).
Y. V. Blagoveshenskiy, N. V. Isaeva, Y. I. Melnik, and N. V. Blagoveshenskaia, “Tantalum and niobium nanopowders for nanoporous material creation,” Rare Metals 28(Spec. Issue. Oct.), 646–649 (2009).
M. V. Kryzhanov, V. M. Orlov, and V. V. Sukhorukov, “Thermodynamic simulation of the magnesium-thermic reduction of niobium and tantalum from pentoxides,” Zh. Prikl. Khim.83(3), 380–385 (2010).
H. Haas, U. Bartmann, T. Komeya, and N. Sato, “Method for producing niobium and tantalum powders,” Germany Patent 2397843, 2010.
H. H. Nersisyan, J. H. Lee, S. L. Lee, and C. W. Won, “The role of the reaction medium in the self propagating high temperature synthesis of nanosized tantalum powder,” Combustion and Flame135(4), 539–545 (2003).
R. Müller, M. Bobeth, H. Brumm, et al., “Kinetics of nanoscale structure development during Mg-vapour reduction of tantalum oxide,” Intern. J. Mater. Res.98(11), 1138–1145 (2007).
V. M. Orlov and M. V. Kryzhanov, “Method of production of a tantalum powder,” RF Patent 2465097, 2012.
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © V.M. Orlov, M.V. Kryzhanov, 2015, published in Metally, 2015, No. 4, pp. 93–97.
Rights and permissions
About this article
Cite this article
Orlov, V.M., Kryzhanov, M.V. Production of tantalum powders by the magnesium reduction of tantalates. Russ. Metall. 2015, 590–593 (2015). https://doi.org/10.1134/S0036029515070101
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0036029515070101