Oxygen solubility in niobium

Kolchin, O. P.; Sumarokova, N.V.

doi:10.1007/bf01221773

Cited by 4 publications

(1 citation statement)

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“…Considering oxygen concentration secondly, it was reported that maximum oxygen solubility in niobium is nearly constant value of about 0.3 wt.% in ranges of 1173 K³ 1273 K. 23) Therefore, the oxygen contents inside the coreniobium in this study probably were kept by a minimal value below 0.3 wt.% during reduction process because the driving force of Mg-reduction was being operated. And the oxide film shown in Fig.…”

Section: Resultsmentioning

confidence: 64%

Metallic Niobium Powder Reduced by Atmospheric Magnesium Gas with Niobium Pentoxide Powder

et al. 2021

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It was tried to find the optimal condition to prepare the metallic niobium powder with minimal oxygen content by atmospheric magnesiumgas reduction of niobium pentoxide (Nb 2 O 5 ) powder at 10731223 K, which are industrially moderate and low temperature ranges until maximally 80 h inside the chamber held under the argon circumstances of 110 kPa. Magnesium oxide of the by-product of the reduction, was dissolved and removed fully by dissolving in a 10% aqueous hydrochloric acid solution. The particle size of the niobium powder reduced for 20 h was slightly increased within the range of 200³600 nm according to increase of reduction temperatures. And such fine particles were further coarsened to near 1 µm by increase of reduction times until 80 h at 1173 K, which is thought to be the most suitable for magnesium-gas reduction to be applied in industry. The reduction time satisfied for a maximal reduction effect was found to be 60 hours as the oxygen content was then minimally saturated to about 0.42 wt.%. Furthermore, the hydrogen contamination due to acid leaching of 0.28 wt.% was fully removed by dehydrogenation, which was a heat treatment performed under vacuum at 827 K for 2 h; this resulted in the formation of metallic niobium powder.

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Section: Resultsmentioning

confidence: 64%