ABOUT THE ROLE OF GRAPHENE-LIKE CARBON IN THE FORMATION OF COATINGS BY THE METHOD OF MICROARC OXIDATION

KOMAROV Alexander I., Ph. D. in Eng., Head of the Laboratory of Modification Techniques of Structural 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.

ZOLOTAYA Polina S., Junior Researcher, 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.

GORBACHUK Nikolay I., Ph. D. in Phys. and Math., Associate Professor of the Department of Physics of Semiconductors and Nano-Electronics, Belarusian State University, Minsk, Republic of Belarus

Based on the provisions of the discharge percolation theory, an interpretation is given for the mechanism of the effect of carbon nanoparticles introduced into the electrolyte on the microarc oxidation process. The effect of graphene-like carbon particles (GC) on the main characteristics of the formed coating is studied using the D16 alloy as an example. It is established that GC introduced in silicate-alkaline electrolytes at a concentration of 250–1000 mg/l intensifies microplasma processes, which is directly evidenced by an increase in the coating thickness by 1.3–2.2 times. At the same time, the participation of graphene particles in the process of coating formation leads to an increase in the content of corundum in it and, as a result, to an increase in microhardness up to 25 GPa relative to 15 GPa for unmodified coatings.

microarc oxidation, modification, aluminum alloys, graphene, shungite, phase composition, microhardness

1. Komarov A.I., Vityaz P.A., Komarova V.I. Sozdanie iznosostoykikh uprochnyayushchikh pokrytiy mikrodugovym oksidirovaniem, neposredstvennoy i posleduyushchey modifikatsiey uglerodnymi nanomaterialami [Creation of wear-resistant hardening coatings by microarc oxidation with direct and subsequent modification by carbon nanomaterials]. Perspektivnye tekhnologii [Advanced technologies], 2011, ch. 6, pp. 114–148.
2. Vityaz P.A., Ilyushchenko A.F., Zhornik V.I. Nanoalmazy detonatsionnogo sinteza: poluchenie i primenenie [Nanodiamonds of detonation synthesis: production and application]. Minsk, Belaruskaya navuka, 2013. 381 p.
3. Komarov A.I., Vityaz P.A., Komarova V.I. The role of fullerene soot in structure formation of MAO-coatings. Nanomechanics Science and Technology, 2013, vol. 4, no. 4, pp. 289–297.
4. Vityaz P.A., Komarov A.I., Komarova V.I., Kuznetsova T.A. Osobennosti formirovaniya iznosostoykikh sloev na poverkhnosti modifitsirovannogo fullerenami MDO-pokrytiya pri trenii [Features of the formation of wear-resistant layers on the surface of the microarc oxidation coating modified by fullerenes in friction]. Trenie i iznos [Friction and wear], 2011, vol. 32, no. 4, pp. 313–325.
5. Vityaz P.A., Komarov A.I., Komarova V.I., Zhukov B.G., Sedov A.I., Ponyaev S.A., Dubovskiy A.L. Rol fullerensoderzhashchikh sazh v strukturoobrazovanii MDO-pokrytiy [The role of fullerene-containing soot in the formation of microarc oxidation coatings]. Nanostruktury v kondensirovannykh sredakh [Nanostructures in condensed media], 2014, pp. 3–12.
6. Vityaz P.A., Komarov A.I., Komarova V.I. Vliyanie nanorazmernykh chastits ugleroda na formirovanie struktury i svoystv mikrodugovykh keramicheskikh pokrytiy na splavah alyuminiya [Influence of nanosized carbon paticles on the formation of the structure and properties of microarc ceramic coatings based on aluminum alloys]. Doklady NAN Belarusi [Reports of the National Academy of Sciences of Belarus], 2013, vol. 57, no. 2, pp. 96–101.
7. Vityaz P.A., Komarov A.I., Komarova V.I. Rol nanougleroda v formirovanii struktury i svoystv mikrodugovykh keramicheskikh pokrytiy na splavah [Role of nanocarbon in the formation of the structure and properties of microarc ceramic coatings on aluminum alloys]. Doklady NAN Belarusi [Reports of the National Academy of Sciences of Belarus], 2013, no. 5, pp. 96–101.
8. Borisov A.M., Crete B.L., Ludin V.B., Morozova N.V., Suminov I.V., Epelfeld A.V. Mikrodugovoe oksidirovanie v elektrolitakh-suspenziyakh (obzor) [Microarc oxidation in electrolyte suspensions (review)]. Elektronnaya obrabotka materialov [Electronic processing of materials], 2016, vol. 52, no. 1, pp. 50–77.
9. Rocca E., Veys-Renaux D., Guessoum K. Electrochemical behavior of zinc in KOH media at high voltage: Micro-arc oxidation of zinc. Journal of Electroanalytical Chemistry, 2015, vol. 754, pp. 125–132.
10. Xiaopeng L., Mohedano M., Blawert C. Plasma electrolytic oxidation coatings with particle additions (A Review). Surface and Coatings Technology, 2016, vol. 10, 307 p.
11. Novikov V.P., Kirik S.A. Nizkotemperaturnyy sposob polucheniya grafena [Low-temperature method for the production of graphene]. Pisma v Zhurnal tekhnicheskoy fiziki [Letters to the Journal of Technical Physics], 2011, vol. 37, iss. 12, pp. 44–49.
12. Rozhkova N.N. Nanouglerod shungitov [Shungite nanocarbon]. Petrozavodsk, Karelskiy nauchnyy tsentr RAN Publ., 2011. 100 p.
13. Shklovskiy B.I., Efros A.L. Elektronnye svoystva legirovannykh poluprovodnikov [Electronic properties of doped semiconductors]. Moscow, Nauka Publ., 1979.