Crystal Structure of Oxide Ceramic Coatings Obtained On Alloys with High Silicon Content

Crystal structure of oxide ceramic coatings obtained on AK9M2 and AK12 alloys is determined. Already after 5 min of processing the AK9M2 alloy by plasma electrolyte oxidation (PEO) method in a standard electrolyte (KOH (3 g/L), Na 2 SiO 3 (2 g/L)), aluminum and silicon form a compound Al 3.21 Si 0.4...

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Bibliographic Details
Published in:Materials science (New York, N.Y.) Vol. 58; no. 4; pp. 480 - 487
Main Authors: Kovalchuk, I. V., Yurkeych, R. M., Posuvailo, V. M.
Format: Journal Article
Language:English
Published: New York Springer US 01.01.2023
Springer
Springer Nature B.V
Subjects:
Alloys
Aluminum base alloys
Aluminum oxide
Analysis
Ceramic coatings
Ceramic materials
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Coatings
Crystal structure
Crystals
Materials Science
Mullite
Oxidation
Silicon
Silicon compounds
Silicon dioxide
Sillimanite
Solid Mechanics
Specialty metals industry
Stability analysis
Structural Materials
Structure
Thermal stability
mullite
silumin
sillimanite
aluminum oxides
crystal structure
X-ray analysis
oxide ceramic coatings
plasma electrolyte oxidation
ISSN:1068-820X, 1573-885X
Online Access:Get full text
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Summary:Crystal structure of oxide ceramic coatings obtained on AK9M2 and AK12 alloys is determined. Already after 5 min of processing the AK9M2 alloy by plasma electrolyte oxidation (PEO) method in a standard electrolyte (KOH (3 g/L), Na 2 SiO 3 (2 g/L)), aluminum and silicon form a compound Al 3.21 Si 0.47 . The thermal stability of compounds with the Al 2 O 3 ∙SiO 2 composition is analyzed. A scheme for converting intermediate oxides into mullite is proposed. The obtained results show that with the increase of silicon content in alloys the amount of sillimanite in the corresponding coatings increases. Increase 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 approximately 4 mass%.
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ISSN:1068-820X
1573-885X
DOI:10.1007/s11003-023-00688-0