Melt–Vapor Phase Transition in the Aluminum–Selenium System in Vacuum

Nitsenko, A. V.; Володин, В. Н.; Linnik, K. A.; Burabayeva, N.M.; Trebukhov, S. A.

doi:10.3390/met13071297

Cited by 4 publications

(3 citation statements)

References 29 publications

(37 reference statements)

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“…The processing of the results and the determination of the saturated vapor pressure value are described in detail in our work [ 34 ].…”

Section: Methodsmentioning

confidence: 99%

Thermodynamics of Formation and Liquid–Vapor Phase Transitions of Antimony Alloys with Selenium and Sulfur

Volodin,

Nitsenko,

Trebukhov

et al. 2023

Materials

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The authors conducted liquid solution studies of antimony with selenium and sulfur in order to provide information on the thermodynamic functions of the formation of these alloys. The studies are based on the vapor pressure values of the components, comprising the double partial systems of antimony with antimony chalcogenides (Sb2Se3 and Sb2S3) and antimony chalcogenides with chalcogens (Se and S). We calculated the thermodynamic functions of mixing (graphical dependencies) and evaporation (tabular data) based on the partial vapor pressure values of components, which are represented by temperature–concentration dependencies. Based on the partial pressure values of melt components, we calculated the boundaries of liquid and vapor coexistence fields at atmospheric pressure (101.3 kPa) and in a vacuum (0.9 kPa). We established the absence of the stratification region on the Sb2S3–S diagram due to the fact that, on state diagrams, the stratification region is indicated at temperatures above 530 °C, while the boiling point of liquid sulfur at an atmospheric pressure corresponds to 429 °C. Based on the position of the field boundaries (L + V) on the state diagrams, the separation of antimony alloys with selenium and sulfur via distillation into elements at atmospheric pressure is difficult due to the high boiling points of antimony-based alloys in a vacuum: Sb2Se3–Se melts require some number of condensate re-evaporation cycles.

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“…The processing of the results and the determination of the saturated vapor pressure value are described in detail in our work [ 34 ].…”

Section: Methodsmentioning

confidence: 99%

Thermodynamics of Formation and Liquid–Vapor Phase Transitions of Antimony Alloys with Selenium and Sulfur

Volodin,

Nitsenko,

Trebukhov

et al. 2023

Materials

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“…This method is based on a sharp increase in the evaporation rate of the volatile component near the equalization of the saturated vapor pressure of the metal and a given inert gas pressure. The boiling point method and the device for its implementation are described in detail in our work [28].…”

Section: N P P Y Y Mole Fraction N N P P mentioning

confidence: 99%

Recycling of beryllium, manganese, and zirconium from secondary alloys by magnesium distillation in vacuum

Volodin,

Abdulvaliyev,

Trebukhov

et al. 2024

KIMS/CUMR/MShKP

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One of the methods for processing secondary magnesium raw materials containing rare refractory metals can be a distillation with the extraction of magnesium into condensate and the accumulation of rare metals in the distillation residue. The residue can be used as a master alloy for special alloys. To justify the possibility of this process, we calculated the boundaries of the vapor-liquid equilibrium fields for the regions of liquid solutions existence in the Mg – Be, Mg – Mn, and Mg – Zr systems at atmospheric pressure (101.33 kPa) and in vacuum (1.33 kPa). The value of the vacuum is due to the fact that a further increase in rarefaction will lead to the magnesium crystallization from the melt, and it will complicate the technology.We established that in the distillation process of magnesium removal from Mg – Be and Mg – Zr alloys, the vapor phase will be represented by more than 99.95 of magnesium. The presence of 0.45 mass.% Mn is possible in the Mg – Mn system at 1000 °C in thevapor phase – condensate . However, results of preliminary tests of the evaporation intensity established that the process conducted at 850-900 °C provides an acceptable evaporation rate of the volatile component (Mg) for technological conditions.Thus, we confirmed the possibility of the proposed method to process secondary light alloys containing beryllium, manganese, and zirconium, which can be involved in the main process intended to produce special alloys in the form of a master alloy with magnesium.

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“…, where i a is thermodynamic activity; The boiling point method (isothermal variant) detailed earlier was used to determine the saturated vapor pressure value [ [26], [27]]. It is based on a significant increase in the evaporation rate at the equality of the external pressure and the saturated vapor pressure of the substance under study when the pressure above the melt decreases at a given temperature.…”

Section: Experimental Partmentioning

confidence: 99%

Thermodynamics of antimony—selenium alloys formation and evaporation

Volodin,

Trebukhov,

Nitsenko

et al. 2023

KIMS/CUMR/MShKP

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The thermodynamic functions of alloy formation and evaporation were considered for two particular systems — Sb – Sb2Se3 and Sb2Se3 – Se in connection with the presence of congruently melting compound Sb2Se3 in the antimony—selenium system. The calculations are based on the partial vapor pressure values of the components forming the particular systems. The thermodynamic activity of antimony selenide and selenium as the most volatile components in the systems was calculated based on the saturated vapor pressure values of antimony selenide over the Sb – Sb2Se3 and selenium melts over Sb2Se3 – Se liquid alloys determined by the boiling point method (isothermal variant). Similar functions of the low volatile components in the above systems: Sb in the first system and Sb2Se3 in the latter one was calculated by numerical integration of the Gibbs—Duhem equation using the substitution proposed by Darken. The partial pressures of antimony selenide and antimony over Sb – Sb2Se3 and Sb2Se3 – Se melts were approximated by temperature—concentration relationships. The system is distinguished with a positive deviation from ideality due to the presence of a delamination region in the first system. The partial and integral entropies and enthalpies of the formation of liquid alloys were calculated based on the values of component activities found as the ratio of the partial vapor pressure of an element or compound above the solution to the saturated vapor pressure of a pure element or compound. The partial and integral functions of alloy formation are presented in the form of graphical dependences on the selenium amount in the melt. The obtained thermodynamic constants will replenish the physical and chemical data base and will be used to calculate the boundaries of the vapor— liquid equilibrium fields on the diagram of state, allowing to determine the possibility and completeness of distillation separation of molten systems.

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Melt–Vapor Phase Transition in the Aluminum–Selenium System in Vacuum

Cited by 4 publications

References 29 publications

Thermodynamics of Formation and Liquid–Vapor Phase Transitions of Antimony Alloys with Selenium and Sulfur

Thermodynamics of Formation and Liquid–Vapor Phase Transitions of Antimony Alloys with Selenium and Sulfur

Recycling of beryllium, manganese, and zirconium from secondary alloys by magnesium distillation in vacuum

Thermodynamics of antimony—selenium alloys formation and evaporation

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