Crystal structure of oxide ceramic coatings obtained on alloys with a high silicon content

Keywords

silumin, plasma electrolyte oxidation, aluminum oxides, oxide ceramic coatings, X-ray analysis, crystal structure, sillimanite, mullite.

Cite as

Kovalchuk I. V., Yurkevych R. M., and Posuvailo V. M. Crystal structure of oxide ceramic coatings obtained on alloys with a high silicon content. Physico­chemical Mechanics of Materials. 2022. 58(4), 050-056.

Abstract

Crystal structure of oxide ceramic coatings obtained on АК9М2 and АК12 alloys is deter­mined. Already after 5 min of processing the АК9М2 alloy the plasma electrolyte oxida­tion (PEO) method in a standard electrolyte (KOH (3 g/l), Na₂SiO₃ (2 g/l)), aluminum and silicon form a compound Al_3.21Si_0.47. The thermal stability of compounds with the compo­sition Al₂O₃ × SiO₂ is analyzed. A scheme for converting intermediate oxides into mullite is proposed. The obtained results show that with an increase in the content of silicon in the alloys, the amount of sillimanite in the corresponding coatings increases. Increase of the duration of the PEO process of silumins processing to 2 h causes a partial transformation of sillimanite into mullite. The maximum content of mullite in coatings is ~ 4 mass%.

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