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Metals 2019, 9(2), 205; https://doi.org/10.3390/met9020205

Extraction of Tantalum Powder via the Magnesium Reduction of Tantalum Pentoxide

1
Titanium Department, Korea Institute of Materials Science (KIMS), Changwon, Gyeongnam 641-010, Korea
2
Department of Metallurgical Engineering, Pukyoung National University, Busan 48513, Korea
*
Authors to whom correspondence should be addressed.
Received: 22 December 2018 / Revised: 3 February 2019 / Accepted: 4 February 2019 / Published: 9 February 2019
(This article belongs to the Special Issue Metals Powders: Synthesis and Processing)
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Abstract

The metallic tantalum powder was successfully synthesized via reduction of tantalum pentoxide (Ta2O5) with magnesium gas at 1073~1223 K for 10 h inside the chamber held under an argon atmosphere. The powder obtained after reduction shows the Ta–MgO mixed structure and that the MgO component was dissolved and removed fully via stirring in a water-based HCl solution. The particle size in the tantalum powder obtained after acid leaching was shown to be in a range of 50~300 nm, and the mean internal crystallite sizes measured by the Scherrer equation varied from 11.5 to 24.7 nm according to the increase in reduction temperatures. The temperature satisfactory for a maximal reduction effect was found to be 1173 K because the oxygen content was minimally saturated to about 1.3 wt %. View Full-Text
Keywords: tantalum powder; magnesium reduction; Ta2O5 powder; MgO; HCl solution tantalum powder; magnesium reduction; Ta2O5 powder; MgO; HCl solution
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Hwang, S.-M.; Wang, J.-P.; Lee, D.-W. Extraction of Tantalum Powder via the Magnesium Reduction of Tantalum Pentoxide. Metals 2019, 9, 205.

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