The role of the reaction medium in the self propagating high temperature synthesis of nanosized tantalum powder

Characteristics of an electrochemical reduction of Ta2O5 for the preparation of metallic tantalum in a LiCl–Li2O molten salt

“…The Li electrochemically produced on the cathode surface proceeds with a chemical reaction with Ta 2 O 5 to form metallic tantalum and Li 2 O at the cathode part. It is well known that Li metal is used as a reactant for the reduction of a metal oxide to its metallic form and Ta 2 O 5 can be reduced by alkali metals according to a chemical reaction [1,10,13]. Also, the Li metal should react with the LiTaO 3 produced by the chemical reaction between Ta 2 O 5 and Li 2 O.…”

“…Recently other methods for the production of tantalum powder have been published to replace the conventional Na reduction process of K 2 TaF 7 [1,10,11]. Ta 2 O 5 has been frequently proposed as a precursor for the preparation of a fine tantalum powder in the new processes.…”

“…Ta 2 O 5 has been frequently proposed as a precursor for the preparation of a fine tantalum powder in the new processes. Nersisyan et al [1] reported on the preparation of nanosized tantalum powder by the self-propagating high-temperature synthesis (SHS) method. They obtained the metallic tantalum from the chemical reaction between Ta 2 O 5 and MgO, which is characterized by a high combustion temperature (>2000 • C).…”

“…Metallic tantalum is used widely in electronics, bioengineering, chemical and mechanical engineering, nuclear power and metallurgy because of its unique properties such as plasiticity, durability, corrosion-stability, refractory properties, high thermal conductivity and small work function [1]. In particular, fine tantalum powder is used for the preparation of capacitors due to its good capacitance and electric conductivity.…”

Combustion synthesis-derived tantalum powder for solid-electrolyte capacitors

“…Recently, a method called MSA-CS (molten salt-assisted combustion synthesis), was reported as an attractive synthesis route to overcome the filtration problems inherent in evaporating Mg into Ta 2 O 5 [9]. In the MSA-CS method, a Ta 2 O 5 + Mg mixture diluted with NaCl is combusted under argon (Ar) gas pressure to produce well-dispersed and ultra-fine Ta powder.…”