Novel Molten Salts Media For Production of Functional Materials

Redkin, Alexander; Катаев, А. А.; Rudenko, A. V.; Dedyukhin, Alexander; Zaikov, Yu. P.

doi:10.1051/matecconf/20166706044

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…8 in the form of fluoride-oxide quasi-binary phase diagrams. 65,66 At the same concentration of NaF the solubility of Sc 2 O 3 is higher in melts with CR = 1.5. In this case, the liquidus temperature of the melt at the Sc 2 O 3 content of 2 mol% is higher by 25-50 degrees.…”

Section: Interaction Of Oxides With Kf-naf-alf 3 Meltsmentioning

confidence: 97%

Review—Synthesis of Aluminum Master Alloys in Oxide-Fluoride Melts: A Review

Suzdaltsev

Pershin

Филатов

et al. 2020

J. Electrochem. Soc.

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A review of the existing methods for producing aluminum master alloys with silicon, zirconium, scandium and boron are given. Basic parameters, advantages and disadvantages of the existing methods are analyzed, indicating the need to develop new more energy-efficient technologies. The prospects of obtaining aluminum master alloys in the electrolysis of melts based on the KF-NaF-AlF 3 -Al 2 O 3 -MeO (MeO = SiO 2, ZrO 2 , Sc 2 O 3 , and B 2 O 3 ) system are considered. For this purpose, the results of physical and chemical measurements in these melts are presented, including data on the solubility of Al 2 O 3 , SiO 2, ZrO 2 , Sc 2 O 3 , and B 2 O 3 oxides in KF-NaF-AlF 3 melts, data on the effect of oxide additives on the liquidus temperature of studied melts, as well as data on the kinetics of electrowinning of aluminum and alloying element from KF-AlF 3 -Al 2 O 3 -MeO melts. Based on the measurements, the parameters were selected and electrolysis tests were carried out for obtaining aluminum master alloys with silicon, zirconium, scandium, and boron from its oxides. The composition and structure of the obtained master alloys were studied.

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Section: Interaction Of Oxides With Kf-naf-alf 3 Meltsmentioning

confidence: 97%

Review—Synthesis of Aluminum Master Alloys in Oxide-Fluoride Melts: A Review

Suzdaltsev

Pershin

Филатов

et al. 2020

J. Electrochem. Soc.

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“…Achebo et al [ 30 ] developed a new flux based on NaCl–CaCl 2 –CaF 2 –Na 3 AlF 6 , by applying the Hadamard multivariate chemical composition model. Tkacheva et al [ 31 ] found that a potassium cryolite-based flux (the KF–AlF 3 and KF–NaF (10 wt.% AlF 3 ) molten mixtures with CR = 1.3–1.5) could play a better refining role in aluminum alloy production. Ni et al [ 32 ] designed a new JDN–Ι aluminum alloy flux, containing rare earth compounds, their experimental results indicated that it had a great effect on the secondary dendrite arm spacing (DAS) of A356 alloy.…”

Section: Introductionmentioning

confidence: 99%

A New Strategy on Designing Fluxes for Aluminum Alloy Melt Refinement

Zhang

et al. 2023

Materials

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With the aim of obtaining a refining flux that is stable and provides effective refining of aluminum melt, a new strategy of designing the flux composition has been proposed. Ten fluxes were designed, by selecting ten molten salt compounds according to their thermophysical parameters, physical properties, and thermodynamic analysis. The melting points of the ten fluxes, and the phases transformation of the fluxes after melting, were studied by DSC and XRD, respectively. The contact angles between four groups of fluxes and alumina at refinement temperatures were studied, and the effect of refinement was characterized by a metallographic microscope. The process of the fluxes removing inclusions and degassing was analyzed thermodynamically. The research findings indicate that flux #10 (11.0 wt.%NaF, 29.5 wt.%NaCl, 46.5 wt.%Na2CO3, 3.0 wt.%CaF2, 10.0 wt.%Na3AlF6) has a melting point (562.2 °C) below the refining temperature. At the refining temperature (760 °C), flux #10 has the lowest contact angle, of 12.78°. In addition, compared to that of flux STJ–A3, currently used in practice, flux #10 has a better refining effectiveness, with the pores and inclusions content of the sample being reduced to 1.11% from 2.96%.

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“…[29][30][31][32][33][34] Nowadays, only attempts for Al-Zr master alloys producing during the electrolysis of cryolite-alumina melt (NaF-AlF 3 ) with ZrO 2 are known. 35 On the other hand, we have demonstrated the ability to synthesize of Al-Sc alloys with 2 wt% scandium by means z E-mail: suzdaltsev_av@mail.ru of electrolysis of KF-NaF-AlF 3 -Sc 2 O 3 melts in a temperature range of 750-950 • C. [36][37][38][39][40] In the present paper, the fundamental principles of the synthesis of Al-Zr alloys and master alloys during the electrolysis of KF-NaF-AlF 3 -ZrO 2 melts are investigated. As well as aluminothermic reduction of ZrO 2 , the kinetics of zirconium electroreduction from KF-NaF-AlF 3 -ZrO 2 melts was studied.…”

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confidence: 99%

Synthesis of Al-Zr Master Alloys via the Electrolysis of KF-NaF-AlF₃-ZrO₂Melts

Филатов

Pershin

Suzdaltsev

et al. 2018

J. Electrochem. Soc.

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Effects of the KF-NaF-AlF 3 melt composition, ZrO 2 concentration and aluminothermic synthesis parameters on the conversion rate of zirconium to aluminum were investigated. The kinetics of zirconium electroreduction on glassy-carbon obtained from KF-AlF 3 -ZrO 2 melts at a temperature of 750 • C was studied via the cyclic voltammetry method. Parameters of the electrolysis of KF-NaF-AlF 3 -ZrO 2 melts were derived on the basis of obtained results, and the theoretical possibility for the electrolytic production of Al-Zr master alloys (having up to 15 wt% zirconium content) was demonstrated.

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Novel Molten Salts Media For Production of Functional Materials

Cited by 4 publications

References 8 publications

Review—Synthesis of Aluminum Master Alloys in Oxide-Fluoride Melts: A Review

Review—Synthesis of Aluminum Master Alloys in Oxide-Fluoride Melts: A Review

A New Strategy on Designing Fluxes for Aluminum Alloy Melt Refinement

Synthesis of Al-Zr Master Alloys via the Electrolysis of KF-NaF-AlF₃-ZrO₂Melts

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Novel Molten Salts Media For Production of Functional Materials

Cited by 4 publications

References 8 publications

Review—Synthesis of Aluminum Master Alloys in Oxide-Fluoride Melts: A Review

Review—Synthesis of Aluminum Master Alloys in Oxide-Fluoride Melts: A Review

A New Strategy on Designing Fluxes for Aluminum Alloy Melt Refinement

Synthesis of Al-Zr Master Alloys via the Electrolysis of KF-NaF-AlF3-ZrO2Melts

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Synthesis of Al-Zr Master Alloys via the Electrolysis of KF-NaF-AlF₃-ZrO₂Melts