Carbothermic Reduction of Ta2O5 by Ar Plasma Arc Melting

A Ta metal has been produced by the carbon-reduction of Ta2O5 by Ar plasma melting. Concentration change of oxygen and carbon impurities in the Ta metal produced by the carbon-reduction has been also investigated. It was found that a pure Ta metal without Ta2O5 and TaC could be obtained when the rat...

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Published inJournal of the Korean Institute of Metals and Materials Vol. 45; no. 11; pp. 622 - 627
Main Authors Choi, Good-Sun, Lim, Jae-Won, Han, Man-Gap, Suh, Chang-Youl, Kim, Byoung-Gyu, Kim, Wonbaek
Format Journal Article
LanguageKorean
Published 01.11.2007
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Summary:A Ta metal has been produced by the carbon-reduction of Ta2O5 by Ar plasma melting. Concentration change of oxygen and carbon impurities in the Ta metal produced by the carbon-reduction has been also investigated. It was found that a pure Ta metal without Ta2O5 and TaC could be obtained when the ratio of carbon and Ta2O5(C/Ta2O5) was 5.0. Considering only total oxygen and carbon concentrations, the Ta metal with the purity of 99.85% could be obtained at the C/Ta2O5 = 5.0. The oxygen concentration in the Ta metal considerably decreased with increasing the C/Ta2O5, and the Vickers hardness of the Ta metal decreased down to about 230-240 Hv with the remarkable decrease in the oxygen concentration, which means that the hardness of Ta metal strongly depends on the oxygen concentration.
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ISSN:1738-8228