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
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
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
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
Nanoscience & Nanotechnology
N. A. Richter, Y. F. Zhang, M. Gong, T. Niu, B. Yang, S. Xue, J. Wang, H. Wang, X. Zhang
Summary: This study presents a solute synergy strategy to stabilize the microstructures and improve thermal stability in high strength nanotwinned (NT) Al-Co-Zr alloys. Zr solute additions promote microstructural and mechanical stability up to 400 degrees C. In-situ microcompression tests demonstrate high strengths and deformability in these ternary NT alloys. Density functional theory calculations provide insight into the interplay between Co and Zr solute and their role in stabilizing incoherent twin boundaries. This work offers a strategy for enhancing both strength and thermal stability of nanocrystalline materials through synergistic solute pairs.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Freddy Leijon, Erik Johansson, Jun Lu, Bjorn Aling, Svein Skjervold, Johan Moverare
Summary: Grain refinement is essential for powder bed fusion additive manufacturing, and this study investigated the effects of different grain refiners on the grain size of Al-2 wt%Cu alloys. The results showed that Ti and Zr were the most effective grain refiners, while V and W had detrimental effects on grain refinement. Additionally, the addition of B also significantly contributed to grain refinement. The relationship between lattice parameters and grain size, as well as epitaxial strain/lattice match, was not clearly established.
MATERIALS & DESIGN
(2022)
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
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
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
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
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
Engineering, Manufacturing
Priyanka Agrawal, Sanya Gupta, Saket Thapliyal, Shivakant Shukla, Ravi Sankar Haridas, Rajiv S. Mishra
Summary: In-depth analysis of the microstructure of an AM alloy revealed promising properties for structural applications, with improved strength and ductility due to the presence of precipitates. The study utilized advanced microscopy techniques to study the microstructure and understand the mechanisms behind the enhanced tensile properties.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Mengmeng Tong, Feng Jiang, Huiling Wang, Jingyu Jiang, Mingjin Wu, Zhongqin Tang
Summary: The research shows that the Al-Mg-Mn-Sc-Zr alloy softens significantly at high temperatures due to a decrease in dislocation density, changes in grain boundaries, and the thermal activation promoting dislocation movements and grain boundary softening. Additionally, the dispersed nano-sized Al3(Sc,Zr) particles formed by adding trace amounts of Sc and Zr have strong inhibition effects, but their effectiveness weakens at higher temperatures, leading to a substantial reduction in flow stress.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Amir R. Farkoosh, David C. Dunand, David N. Seidman
Summary: The precipitation and creep behavior of Al-Mn-Si alloys with L1(2)-forming elements Zr and Er were examined, showing significantly higher creep resistance in the Zr and Er-added alloy. Nanoscale and micron-sized precipitates were found to influence the alloy's performance.
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
Chemistry, Physical
Alexey Shishkin, Vladimir Yu Shishkin, Aleksandr A. Pankratov, Anna A. Burdina, Yuriy P. Zaikov
Summary: The reduction reactions of CeO2, Nd2O3 and a La2O3-Nd2O3-CeO2 mixture in the lithium chloride electrolysis process were studied. By applying various analytical methods, it was found that the formation of metallic rare-earth elements was not observed at the cathode potential.
Article
Electrochemistry
Aleksey V. Shishkin, Vladimir Yu. Shishkin, Andrey Yu. Nikolaev, Aleksandr A. Pankratov, Andrey V. Suzdaltsev, Yuriy P. Zaikov
Summary: The reduction of spent nuclear fuel components to metals is crucial for the development of fuel reprocessing technology. This study investigated the reduction of ZrO2 by lithium during the electrolysis of LiCl-Li2O melt at 650°C. It was found that the presence of ZrO2 led to increased cathode currents and decreased lithium oxidation current, indicating the consumption of lithium for the reduction of ZrO2 samples. X-ray phase analysis and microscopy techniques were used to analyze the reduction products, and it was observed that lithium zirconate (Li2ZrO3) was formed during the electrolysis process.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(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.
