Article
Green & Sustainable Science & Technology
Liyu Chen, Jiaxin Yang, Yifan Zhang, Shaohua Wu, Youjian Yang, Wenju Tao, Zhaowen Wang
Summary: This study investigated the synthesis of an Al-Zr master alloy using a combination of aluminothermic reduction and molten salt electrolysis processes. The reduction parameters were optimized to achieve high Zr content and recovery rate in the alloy. Additionally, electrolysis of the reduced molten salt successfully extracted Zr, resulting in a high recovery rate. This two-step process shows feasibility for large-scale extraction of Zr and production of Al-Zr master alloys.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Materials Science, Multidisciplinary
Aleksandr Filatov, Andrey Suzdaltsev, Yurii Zaikov
Summary: A novel method for continuously obtaining Al-Zr master alloys from oxide raw materials was proposed and applied in grain refinement and improvement of aluminum alloy properties. The addition of zirconium to the alloy significantly refined the grain size, while a joint effect of alloying and rate cooling could achieve further grain size reduction.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2021)
Article
Metallurgy & Metallurgical Engineering
Sai Krishna Padamata, Andrey Yasinskiy, Aleksandr Shabanov, Timofey Bermeshev, You-jian Yang, Zhao-wen Wang, Dao Cao, Peter Polyakov
Summary: By studying the anodic behavior of Cu-Al-based anodes in KF-AlF3-Al2O3 melts, it was found that pre-oxidised anodes have a lower corrosion rate compared to those without pre-oxidation treatment.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Electrochemistry
Liyu Chen, Jiaxin Yang, Yifan Zhang, Shaohua Wu, Youjian Yang, Wenju Tao, Jiangyu Yu, Zhaowen Wang
Summary: The electrochemical behavior of Zr(IV) on a molybdenum electrode in a KF-AlF3-Al2O3-ZrO2 molten salt system was investigated through cyclic voltammetry, square-wave voltammetry, and chronopotentiometry. The reduction process of Zr(IV) followed a two-step, two-electron transfer mechanism. The electrodeposition of Al-Zr alloys was successfully achieved on both the Mo and liquid aluminum electrodes.
ELECTROCHIMICA ACTA
(2023)
Article
Electrochemistry
Andrey Suzdaltsev, Yuriy Zaikov
Summary: The present study focuses on obtaining new fundamental data on the electrochemical behavior of oxygen-evolving anodes in fluoride-oxide melts. By using potentiometric, cyclic voltammetric, and chronopotentiometric methods, the function of platinum and its anode behavior during electrolysis of KF-AlF3-Al2O3 based melt was investigated. The impact of electrolyte composition, temperature, atmosphere, potential sweep rate, and current density on the kinetics of the anode process was explored. The experimental results confirmed the earlier proposed scheme of the anode process on platinum in low temperature KF-AlF3-Al2O3 based melts, and will be used for theoretical modeling and studying the kinetics of the anode process on oxygen-evolving anodes in fluoride-oxide melts.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Metallurgy & Metallurgical Engineering
Bing-xu Chen, Jian-ping Peng, Yao-wu Wang, Yue-zhong DI
Summary: This study focuses on the electrolyte penetration in a graphite cathode of a NaF-KF-LiF-AlF3 aluminum-electrolysis system. The results show that KF promotes electrolyte penetration, while LiF effectively prevents it.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Chemistry, Physical
Liyu Chen, Jiaxin Yang, Youjian Yang, Jiangyu Yu, Xianwei Hu, Wenju Tao, Zhaowen Wang
Summary: The solubility of ZrO2 in KF-AlF3-Al2O3 molten salts was measured, and the influence of temperature and electrolyte composition on solubility was analyzed. The analysis of X-ray diffraction and Raman spectroscopy results determined the dissolution mechanism of ZrO2.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Materials Science, Multidisciplinary
Jinzhao Guan, Kaiyu Xie, Aimin Liu, Zhongning Shi, Gong Chen, Miroslav Boca
Summary: In this study, Al-Si alloy was prepared via aluminothermic reduction-molten salt electrolysis of SiO2, using liquid aluminum as the working cathode. The Faradic current efficiency of the process was calculated as 28.4%, indicating that the Al-Si alloy was predominantly prepared in the aluminothermic reduction step, supplemented by electrolysis.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Metallurgy & Metallurgical Engineering
A. A. Filatov, A. Yu Nikolaev, A. Suzdaltsev, Yu P. Zaikov
Summary: This study proposes a method for extracting zirconium from its oxide by electrolysis, resulting in the reliable selective extraction of zirconium with high weight percentage from the KF-AlF3-Al2O3-ZrO2 melt.
RUSSIAN JOURNAL OF NON-FERROUS METALS
(2022)
Article
Materials Science, Multidisciplinary
Ping Pan, Shi-Hong Yan, Lin Zhou, De-Hong Chen, Hong-Bo Yang, Rui-Ying Miao
Summary: The electrochemical formation of La-Al alloys in LiF-CaF2 molten salt was investigated using various electrochemical techniques. The results showed the presence of four types of Al-La intermetallic compounds. An Al-La alloy was obtained through galvanostatic electrolysis. Analysis of the electrolytic products using XRD and EDS revealed the phase composition and microstructure of the alloys.
Article
Materials Science, Multidisciplinary
Yuri Osetskiy, Alex Plotkowski, Ying Yang
Summary: This paper presents the results of an extended atomistic study on the intrinsic atomic transport in Al-Zr alloys. It is found that the addition of Zr atoms decelerates the overall self-diffusion, with a stronger effect in the solid phase compared to the liquid phase. The transport of Zr atoms is slower than that of Al atoms, and this bias effect is more pronounced in the solid phase. The diffusion and chemical ordering processes are much faster in the liquid state compared to the solid state. The chemical short-range order parameters in the liquid state saturate at values close to those in the ordered L12 structure of Al3Zr. Chemical and structural ordering in the solid phase is negligible over the modeled microsecond time scale.
Article
Electrochemistry
Wenjuan Xiong, Zeng Chen, Na Li, Meiyue Liu, Putao Zhang, Yiming Chen, Shengjun Li, Weifeng Zhang
Summary: The study investigated the electrochemical preparation of Zn-Zr and Zn-Zr-Mg alloys in molten salt, exploring their reduction mechanisms and electrolysis parameters. The results confirmed the potential of this method for preparing novel zinc-based alloys.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Clement N. Ekaputra, Jovid U. Rakhmonov, David Weiss, Jon-Erik Mogonye, David C. Dunand
Summary: The microstructure and mechanical properties of two die-cast hypoeutectic Al-Ce-based alloys modified with Sc, Zr, and Er micro-additions were studied. The Al11Ce3 platelets and L12 Al3(Sc,Zr,Er) nanoprecipitates were found to synergistically interact in strengthening the alloys, resulting in improved hardness and creep resistance.
Article
Physics, Applied
Yufei Wang, Yaojun Miao, Peng Peng, Haiyan Gao, Jun Wang, Baode Sun
Summary: The orientation at the interfaces significantly affects the morphology of aging precipitates in Al-Zr-Y composites. First-principles calculations reveal that the most stable orientation at the Al/Al-3(Zr,Y) interface is FCC-Al(001)/FCC-Al3Y(001). Zr and Y doping can lower the interface energies, with Y doping dominating the interface with the increase of substituted elements content.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Electrochemistry
J. Kramp, S. Shankar, J. R. Kish
Summary: The objective of this study was to determine the localized corrosion susceptibility of two artificially-aged 7xx.x Al alloy near net-shaped solidified castings. Electrochemical polarization, bulk immersion measurements, and electron microscopy techniques were used to reveal the controlling microstructure aspects associated with corrosion. Both alloys exhibited pit-like corrosion involving selective grain attack, with the over-aged temper showing the lowest corrosion susceptibility and Al2CuMg phase particles being particularly problematic for corrosion.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Timofey Gevel, Sergey Zhuk, Andrey Suzdaltsev, Yuriy Zaikov
Summary: This study investigates the kinetics of silicon electrodeposition in the KCl-K2SiF6 molten system and demonstrates that the presence of fluoride ions allows for the required amount of silicon ions. Additionally, silicon electrodeposition is shown to be a reversible 4-electron process.
Article
Electrochemistry
Yu Ustinova, O. Pavlenko, T. Gevel, S. Zhuk, A. Suzdaltsev, Yu Zaikov
Summary: The possibility of silicon electrodeposition from low-melting LiCl-KCl-CsCl-K2SiF6 electrolytes was studied. The stability of a silicon-containing additive and the rate constant of SiF4 release were found to be temperature dependent. The electrochemical behavior of K2SiF6 in the melts was irreversible and proceeded through a 4-electron reaction. Dendritic silicon deposits were obtained under selected deposition parameters.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Metallurgy & Metallurgical Engineering
A. A. Filatov, A. Yu Nikolaev, A. Suzdaltsev, Yu P. Zaikov
Summary: This study proposes a method for extracting zirconium from its oxide by electrolysis, resulting in the reliable selective extraction of zirconium with high weight percentage from the KF-AlF3-Al2O3-ZrO2 melt.
RUSSIAN JOURNAL OF NON-FERROUS METALS
(2022)
Article
Chemistry, Multidisciplinary
Anastasia M. Leonova, Oleg A. Bashirov, Natalia M. Leonova, Alexey S. Lebedev, Alexey A. Trofimov, Andrey V. Suzdaltsev
Summary: Research on developing materials with higher energy density for lithium-ion batteries is being conducted worldwide. Composite anode materials based on Si and C ultrafine particles are considered promising due to their high capacity. A new approach for carbothermal synthesis of C/SiC composite mixtures with fibrous morphology SiC particles has been proposed. The resulting mixtures showed potential use as anode materials for lithium-ion batteries with good energy characteristics and high Coulombic efficiency.
APPLIED SCIENCES-BASEL
(2023)
Article
Electrochemistry
Andrey Suzdaltsev, Yuriy Zaikov
Summary: The present study focuses on obtaining new fundamental data on the electrochemical behavior of oxygen-evolving anodes in fluoride-oxide melts. By using potentiometric, cyclic voltammetric, and chronopotentiometric methods, the function of platinum and its anode behavior during electrolysis of KF-AlF3-Al2O3 based melt was investigated. The impact of electrolyte composition, temperature, atmosphere, potential sweep rate, and current density on the kinetics of the anode process was explored. The experimental results confirmed the earlier proposed scheme of the anode process on platinum in low temperature KF-AlF3-Al2O3 based melts, and will be used for theoretical modeling and studying the kinetics of the anode process on oxygen-evolving anodes in fluoride-oxide melts.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Electrochemistry
Yu. Parasotchenko, A. Suzdaltsev, O. Pavlenko, Yu. Zaykov
Summary: In this study, the kinetics of silicon electrodeposition and the initial stages of the process were investigated using various electrochemical methods. The reduction of silicon at the cathode was found to occur in one irreversible stage. The diffusion coefficient of silicon ions was determined to be 8.44 x 10(-11) and 1.00 x 10(-10) m(2) s(-1) using cyclic voltammetry and chronoamperometry, respectively. The electrodeposition of silicon on glassy carbon was found to proceed progressively with the continuous formation of new nuclei. The obtained silicon films had a thickness of several microns and consisted of spherical nuclei up to 0.7 microns in diameter. The impurity content in the deposits was extremely low, with oxygen being the main contaminant (0.4-1.2 wt%).
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Anna A. Maslennikova, Peter N. Mushnikov, Alexey V. Dub, Olga Yu Tkacheva, Yury P. Zaikov, Ya-Lan Liu, Wei-Qun Shi
Summary: The quantitative determination of oxygen-containing impurities in the LiF-NaF-KF eutectic was performed using electrochemical and reduction melting methods. The analysis showed that the concentration of oxygen-containing impurities decreased by a factor of 7 after electrolysis. The correlation between the electrochemical techniques and reduction melting methods allowed for the evaluation of the quality of the LiF-NaF-KF melt.
Editorial Material
Chemistry, Multidisciplinary
Andrey Suzdaltsev, Oksana Rakhmanova
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Chemical
Alexey V. Shishkin, Vladimir Yu. Shishkin, Anna A. Maslennikova, Aleksander B. Salyulev, Peter N. Mushnikov, Yury P. Zaikov
Summary: The electrochemical reduction of pelleted heterophase powder Pd-Nd2O3-CeO2 mixtures in molten LiCl-Li2O (1-1.5 wt%) was investigated at 650°C. The composition of the mixture and electrochemical factors, including the amount of electricity passed and the cathode potential, were examined. It was observed that metallic palladium in the mixture can reduce neodymium and cerium oxides through lithium released at the cathode, resulting in the formation of intermetallic compounds with different compositions. Various intermetallic compounds, such as CePd3, NdPd3, CePd, NdPd, Ce3Pd4, and Nd3Pd4, were synthesized depending on the cathode potential and the presence of liquid lithium.
Article
Engineering, Chemical
Andrey Nikolaev, Albert Mullabaev, Andrey Suzdaltsev, Yuriy P. Zaikov
Summary: This paper studies the possibility of electrochemical purification of PbCl2 from PbO and the effective control of oxide ions concentration in molten PbCl2 at 520°C. Potentiostatic electrolysis was used to remove oxide additions from the melt, and linear and square-wave voltammetry dependencies were recorded. Empirical linear dependencies of the anode peak current on PbO concentration were obtained, which can be used for in-situ control over PbO concentration in the melt. The deep electrochemical purification of PbCl2 melt from molten oxide was achieved.
Article
Chemistry, Physical
Yulia A. Parasotchenko, Timofey A. Gevel, Olga B. Pavlenko, Leonid V. Gorshkov, Natalia M. Leonova, Andrey V. Suzdaltsev, Yury P. Zaikov
Summary: This study aimed to investigate the kinetics of silicon electrodeposition from different chloride melts and determine optimal melt compositions and electrolysis parameters. The results showed that silicon electrodeposition rates were highest in LiCl-KCl-CsCl melts and increased with lower lithium chloride content. In contrast, silicon was deposited in the form of fibers and dendrites in other melts.
Article
Engineering, Electrical & Electronic
R. K. Abdurakhimova, S. S. Tulenin, N. M. Leonova, A. S. Shmygalev, A. V. Suzdaltsev
Summary: This study tested a technique for preparing layered structures based on PbS on silicon substrates for the first time, and found that lead sulfide films can be obtained via chemical deposition from aqueous media, leading to improved performance characteristics of the multilayer design.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Nuclear Science & Technology
A. Yu. Nikolaev, A. R. Mullabaev, A. V. Suzdaltsev, V. A. Kovrov, A. S. Kholkina, V. Yu. Shishkin, Yu. P. Zaikov
Summary: This article discusses an installation for purifying alkali-metal chlorides, which is used in the pyrochemical processing of spent fuel from fast reactors. The main technological operations of the installation and the optimal parameters for salt purification are described.
