Preparation of tantalum powders by reduction of complex oxyfluoride compounds by sodium
https://doi.org/10.17073/1997-308X-2015-3-11-17
Abstract
Substances (K2Ta2O3F6, K3TaOF6, K2TaOF3, and KTaOF4) most suitable for the use as oxygen-containing additives in the sodiumthermal fabrication of finely dispersed tantalum powder are selected from the melts containing complex oxyfluoride compounds of tantalum based on thermodynamic and experimental investigations of reduction reactions of tantalum compounds with sodium. The application of mentioned compounds gives the opportunity to fabricate the tantalum powders with the specific surface at a level of 3–5 m2/g, which is higher by a factor of 8–10 compared with powders prepared under the same conditions upon reducing K2TaF7. It is shown that the prepared tantalum powders can be demanded as the initial material to create the capacitor powder with the charge of 70000–100000 μC/g.
About the Authors
V. N. Kolosov
Институт химии и технологии редких элементов и минерального сырья им. И.В. Тананаева
Кольского научного центра РАН (ИХТРЭМС КНЦ РАН), г. Апатиты, Мурманская обл.
Russian Federation
Russian Federation
M. N. Miroshnichenko
Институт химии и технологии редких элементов и минерального сырья им. И.В. Тананаева
Кольского научного центра РАН (ИХТРЭМС КНЦ РАН), г. Апатиты, Мурманская обл.
Russian Federation
Russian Federation
T. Yu. Prokhorova
Институт химии и технологии редких элементов и минерального сырья им. И.В. Тананаева
Кольского научного центра РАН (ИХТРЭМС КНЦ РАН), г. Апатиты, Мурманская обл.
Russian Federation
Russian Federation
V. M. Orlov
Институт химии и технологии редких элементов и минерального сырья им. И.В. Тананаева
Кольского научного центра РАН (ИХТРЭМС КНЦ РАН), г. Апатиты, Мурманская обл.
Russian Federation
Russian Federation
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Review
For citations:
Kolosov V.N., Miroshnichenko M.N., Prokhorova T.Yu., Orlov V.M. Preparation of tantalum powders by reduction of complex oxyfluoride compounds by sodium. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2015;(3):11-17. (In Russ.) https://doi.org/10.17073/1997-308X-2015-3-11-17
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