About the mechanism of the formation of aluminum oxides in iron carbonate melts

Processy litʹâ, 2021, Tom 143, №1, p.28-37

Authors

  • B. F. Belov Institute for Problem of Materials Science of the National Academy of Science of Ukraine (Kyiv, Ukraine)
  • A. I. Trotsan Institute for Problem of Materials Science of the National Academy of Science of Ukraine (Kyiv, Ukraine)
  • Ya. P. Karlikova* *Pryazovskyi State Technical University (PSTU), (Mariupol, Ukraine)
  • I. V. Rjabchikov** I. V. Rjabchikov**, Dr. Sci. (Engin.), Scientific consultant

DOI:

https://doi.org/10.15407/plit2021.01.028

Keywords:

polygonal diagram, aluminum oxides, quantum mechanical parameters, classification and structuring

Abstract

Received 11.11.2020

UDK 669.189:669.046.554

A polygonal diagram of the state of the Al-Al2O3 system in the entire range of concentrations of solid and liquid initial components was constructed using the graphical-analytical method. In contrast to the known one, this diagram shows a sequential series of aluminum oxides, including the primary phase Al2O, secondary intermediate phases AlO and Al3O4, which coexist with liquid aluminum, as well as the area of their separation. Based on the quantum-mechanical parameters of aluminum and oxygen, an analysis of the structural-chemical state of the oxides was carried out and a sequential series of intermediate phases between aluminum and corundum, which are formed in liquid and solid states, were established: Alliq. → Al2O (Al6O3)liq.4+: (Al12O6)sol.0 → AlO (Al4O4)liq.4+:(Al8O8)sol.0 → Al3O4 × (Al6O8)liq.2+: (Al12O16)sol.0 → Al2O3 (Al4O8)liq.4-: (Al16O24)sol.0. For the established intermediate phases of aluminum oxides, structural and chemical reactions of their formation, chemical and structural formulas, temperatures of their formation and melting are given. All lower oxides are formed in the solid state and coexist with liquid aluminum. Spinel AlO ∙ Al2O3 → (Al3O4) is formed at a monotectic temperature of 1900 0С. The sequence of formation of aluminum oxides depends on the number of particles and the relative packing density of polygonal and polyhedral cells of ion-molecular complexes of aluminum and oxygen ions. It is shown that under oxygen deficiency in a metal melt on the basis of lower aluminum oxides, full-valent oxysulfides (Al6O3S2)0 → (Al4O4S2)0 are formed, which exist at the temperatures of liquid steel, and (Al12S6)0, (Al8S8)0, which are present in the solid metal. In a deeply deoxidized metal, which contains sulfur and aluminum, aluminum sulfides of low and linear valence of the stoichiometric composition Al12S6 → Al8S8 → Al12S16 → Al16S24 are formed in the solid state, depending on the oxidation of the metal. The presented results supplement the known experimental data on the phase diagram of the Al-Al2O3 system and allow us to reveal the mechanism of the formation of nonmetallic inclusions during the deoxidation of steel with aluminum.

Author Biographies

B. F. Belov, Institute for Problem of Materials Science of the National Academy of Science of Ukraine (Kyiv, Ukraine)

PhD (Engin.), Senior Research Scientist

A. I. Trotsan, Institute for Problem of Materials Science of the National Academy of Science of Ukraine (Kyiv, Ukraine)

Dr. Sci. (Engin.), Prof.

Ya. P. Karlikova*, *Pryazovskyi State Technical University (PSTU), (Mariupol, Ukraine)

PhD (Engin.), Associate Professor

I. V. Rjabchikov**, I. V. Rjabchikov**, Dr. Sci. (Engin.), Scientific consultant

Dr. Sci. (Engin.), Scientific consultant

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Published

26-02-2021

How to Cite

Belov Б. Ф. ., Trotsan А. І., Karlikova* Я. П., & Rjabchikov І. В. (2021). About the mechanism of the formation of aluminum oxides in iron carbonate melts: Processy litʹâ, 2021, Tom 143, №1, p.28-37. Casting Processes, 143(1), 28–37. https://doi.org/10.15407/plit2021.01.028

Issue

Casting processes №1 (143) 2021

Section

PHASE INTERACTION

License

Copyright (c) 2021 Б. Ф. Бєлов, А. І. Троцан, Я. П. Карлікова*, І. В. Рябчиков**

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