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KOMAROV Alexander I., Ph. D. in Eng., Head of the Laboratory of Modification Technologies of Engineering Materials, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

GORANSKIY Georgiy G., Ph. D. in Eng., Leading Researcher of the Department of Multi-Functional Coatings, Science and Technology Park of BNTU “Polytechnic”, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

Year 2018 Issue 3 Pages 75–82
Type of article RAR Index UDK 621.793 Index BBK  

The efficiency of creating oxide-ceramic coatings on the surface of steel products is demonstrated by the combination of preliminary cold gas-dynamic spraying of an aluminum sublayer and its subsequent microarc oxidation. The resulting gas-dynamic coatings are a composite material consisting of an aluminum matrix and inclusions of corundum particles (~15  %), assimilated from the powder sprayed. Homogeneous with a low (1–6  %) porosity base structure and evenly distributed corundum particles provide a high level of adhesion (up to 122 MPa), hardness (up  to 1140 MPa) and viscosity (up to 46  %) of coating. The ceramic coatings formed on an aluminum sublayer with a thickness of up to 180 μm are characterized by a homogeneous structure of the base layer. The phase composition of the surface layers of coatings is represented by γ-Al2O3, high-strength α-Al2O3 oxides and mullite, the content of which is 45  %, 40  %, 15  %, respectively. With the deepening into the coating, a significant (up to 80  %) increase in the content of Al2O3 is noted with a simultaneous decrease in the volume fraction of γ-Al2O3 and the absence of mullite. A consequence of this is a sufficiently high (up to 19 GPa) level of maximum hardness values in these coating layers, a reduction in the coefficient of friction to a value of 0.048 at the stage of steady wear with limited oil supply, and no wear of the ceramic coating under these test conditions.


cold gas-dynamic spraying, microarc oxidation, ceramic coating, adhesion, microhardness, corundum

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