OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 25 No. 2 2023 Structure and properties of WC-10Co4Cr coatings obtained with high velocity atmospheric plasma spraying Elena Kornienko 1, а,*, Igor Gulyaev 2, b, Viktor Kuzmin 2, c, Alexandr Tambovtsev 2, d, Pavel Tyryshkin 2, e 1 Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk, 630073, Russian Federation 2 Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, 4/1 Institutskaya str., Novosibirsk, 630090, Russian Federation a https://orcid.org/0000-0002-5874-5422, e.kornienko@corp.nstu.ru, b https://orcid.org/0000-0001-5186-6793, gulyaev@itam.nsc.ru, c https://orcid.org/0000-0002-9951-7821, vikuzmin57@mail.ru, d http://orcid.org/0000-0003-1635-9352, alsetam123@icloud.com, e https://orcid.org/0009-0009-8125-6772, pavel99730@gmail.com Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2023 vol. 25 no. 2 pp. 81–92 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2023-25.2-81-92 ART I CLE I NFO Article history: Received: 24 March 2023 Revised: 02 April 2023 Accepted: 08 April 2023 Available online: 15 June 2023 Keywords: Plasma spraying High velocity atmospheric plasma spraying Coating WC-Co HV-APS Funding The work was supported by the Ministry of Science and Higher Education (project No. 121030500145-0). Acknowledgements Research was partially conducted at core facility “Structure, mechanical and physical properties of materials”. ABSTRACT Introduction. Carbon steel is often used for the manufacture of various machine parts, but its operation in aggressive conditions (operation of steel parts under conditions of wear, high temperatures and aggressive corrosive environments) contributes to an extreme decline in properties, up to failure. To solve this problem the modification of the working surfaces of steel parts can be used. It increases its wear resistance, corrosion resistance, and service life. Metal-ceramic coatings based on WC are often used to improve the hardness, wear resistance and corrosion resistance of steel parts. The work purpose is to study the effect of high velocity atmospheric plasma spraying (HV-APS) modes on the structure, phase composition and properties of WC-Co coatings. Materials and methods. 86% WC-10% Co-4% Cr coatings were deposited on a mild steel substrate with help of the HV-APS method. The structure and phase composition of the coatings were analyzed using optical microscopy, scanning electron microscopy, and X-ray phase analysis. In addition, the results of measurements of porosity, microhardness, wear resistance, as well as a qualitative assessment of the adhesion are shown in this paper. Results and discussion. It is shown that all coatings are characterized by high density, absence of cracks and oxide films. Using the SEM and XRD methods, it is found that the coatings contain WC and W2C particles uniformly distributed in the metal matrix. The matrix is an amorphous or nanocrystalline supersaturated Co(W,C) solid solution. The maximum amount of carbides (49 %) is observed in coatings obtained by deposition from a distance of 170 mm, arc current – 140 A; the minimum (25 %) is observed in coatings obtained by deposition from a distance of 250 mm, arc current – 200 A. The coatings with the maximum amount of carbides have the maximum values of microhardness (1,284 HV0.1) and wear resistance. It is established that all coatings are characterized by high adhesion. For citation: Kornienko E.E., Gulyaev I.P., Kuzmin V.I., Tambovtsev A.S., Tyryshkin P.A. Structure and properties of WC-10Co4Cr coatings obtained with high velocity atmospheric plasma spraying. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2023, vol. 25, no. 2, pp. 81–92. DOI: 10.17212/1994-6309-2023-25.2-81-92. (In Russian). ______ * Corresponding author Kornienko Elena E., Ph.D. (Engineering), Associate Professor Novosibirsk State Technical University, 20 Prospekt K. Marksa, 630073, Novosibirsk, Russian Federation Tel.: 8 (383) 346-11-71, e-mail: e.kornienko@corp.nstu.ru Introduction Various machine components are often made of steel. This is because steel has the complex of high mechanical, technological and physical-chemical properties. Despite these advantages, the operation of steel components in aggressive conditions – operation of steel parts under conditions of wear, high temperatures and aggressive corrosive environments – contributes to a rapid decrease in its properties, up to failure. The
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