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Vol.45, No.11, 622 ~ 628, 2007
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| Title |
| Smelting & Refining ; Carbothermic Reduction of Ta2O5 by Ar Plasma Arc Melting |
| 김병규 Byoung Gyu Kim , 김원백 Won Baek Kim , 최국선 Good Sun Choi , 서창열 Chang Youl Suh , 임재원 Jae Won Lim , 한만갑 Man Gap Han |
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| Abstract |
| 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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| Key Words |
| tantalum, plasma arc melting, carbon-reduction, refining, Vickers hardness, impurity |
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