Electrochemical deoxidation of yttrium-oxygen solid solutions

Okabe, Toru H.; Deura, T. N.; Oishi, Takao; Ono, Ken; Sadoway, Donald R.

doi:10.1016/0925-8388(95)02129-9

Cited by 69 publications

(44 citation statements)

References 12 publications

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“…Subsequent deoxidation after reduction is driven by the electrochemical deoxidation mechanism that Ca absorbs the oxygen in -Ti. 26,27) The by-product CaO should be removed by dissolution to the molten salt. When the sample was surrounded by the dense Ti walls (see #G-2), however, the deoxidation was suppressed.…”

Section: Resultsmentioning

confidence: 99%

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Reduction of TiO2 in Molten CaCl2 by Ca Deposited during CaO Electrolysis

Suzuki

Fukui

2004

Mater. Trans.

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Fundamental experiments are conducted to confirm the calcium reactivity with titanium oxide in the molten calcium chloride. The TiO 2 samples placed in the molten salt could be reduced without any electron supply to TiO 2 . In the close vicinity of cathode, TiO 2 could be successfully reduced to -Ti with 1600 mass ppm oxygen. However, the strong stirring of the melt disturbed the calcium distribution near the cathode and the reduction was incomplete. These findings supported the proposed mechanism that Ca deposited on the cathode and it dissolved immediately into the molten salt. The parasite reactions consumed the dissolved Ca quickly, and they suppressed the effective reduction and subsequent deoxidation.

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Section: Resultsmentioning

confidence: 99%

“…On the other hand, the reduction mechanism was explained also by the ''electron mediated reaction'' [22][23][24]26) that the electron was exchanged between TiO 2 and Ca via Ti metals such as,…”

Section: Electron Transport Through Metalmentioning

confidence: 99%

Reduction of TiO2 in Molten CaCl2 by Ca Deposited during CaO Electrolysis

Suzuki

Fukui

2004

Mater. Trans.

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“…Similarly, Okabe et al [30] deliberately generated calcium in situ by electrolyzing CaCl 2 , which, in turn, reacted with the dissolved oxygen present in impure titanium. The presence of a sufficient quantity of CaO in CaCl 2 would generate calcium (Eq.…”

Section: Mechanism Of the Deoxygenation Reactionmentioning

confidence: 99%

Electrochemical Deoxidation of Titanium Foam in Molten Calcium Chloride

Tripathy

Gauthier

Fray

2007

Metall Mater Trans B

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“…Assuming that CaO was once separated from the reduced powder in a wet-chemical process, and that the particle size were coarsened, the below-mentioned deoxidation using the similar experimental setup can be applied to match with the market demand. Okabe et al reported that both the halide flux deoxidation and the electrochemical deoxidation were effective to obtain Ti and Y with the extra-low oxygen [19][20][21]28,29]. 1g of a commercial V powder (<125 m) was naturally oxidized to 1.45 mass%, and filled in the Ti basket.…”

Section: Deoxidation From Vmentioning

confidence: 99%

Direct Reduction of Vanadium Oxide in Molten CaCl2

Suzuki

Ishikawa

2007

ECS Trans.

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A combined process of electrolysis of CaO in the molten CaCl 2 and of calciothermic reduction, so-called OS process, was applied to prepare metallic vanadium directly from V 2 O 3 . The fine metallic powder containing 1860 mass ppm oxygen was obtained using 0.5mol%CaO-CaCl 2 melt for 10.8 ks at 1173 K. The oxygen level did not decrease further even when twice electricity was applied. Because the metallic vanadium could be electrochemically deoxidized to the level of 10 ppm oxygen from 1.48 %, the large amount of by-product, CaO, due to reduction and the large surface area of the fine particles are the reasons of high oxygen content in the reduced powder.

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Electrochemical deoxidation of yttrium-oxygen solid solutions

Cited by 69 publications

References 12 publications

Reduction of TiO<SUB>2</SUB> in Molten CaCl<SUB>2</SUB> by Ca Deposited during CaO Electrolysis

Reduction of TiO<SUB>2</SUB> in Molten CaCl<SUB>2</SUB> by Ca Deposited during CaO Electrolysis

Electrochemical Deoxidation of Titanium Foam in Molten Calcium Chloride

Direct Reduction of Vanadium Oxide in Molten CaCl2

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