OBRABOTKAMETALLOV Vol. 24 No. 4 2022 135 MATERIAL SCIENCE Deposition of titanium silicide on stainless steel AISI 304 surface Alexander Burkov 1, a, *, Valeria Krutikova 2, b 1 Institute of Materials Science of the Khabarovsk Scientifi c Center of the Far-Eastern Branch of the Russian Academy of Sciences, 153 Tikhookeanskaya, Khabarovsk, 680042, Russian Federation 2 Institute of Tectonics and Geophysics, Far Eastern Branch of the Russian Academy of Sciences, 65 Kim Yu Chen street, Khabarovsk, 680000, Russian Federation a https://orcid.org/0000-0002-5636-4669, burkovalex@mail.ru, b https://orcid.org/0000-0001-9977-2809, nm32697@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. 2022 vol. 24 no. 4 pp. 127–137 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2022-24.4-127-137 ART I CLE I NFO Article history: Received: 02 August 2022 Revised: 06 September 2022 Accepted: 08 September 2022 Available online: 15 December 2022 Keywords: Coating Electrospark deposition Stainless steel AISI 304 Titanium silicide Ti5Si3 Coeffi cient of friction Corrosion Oxidation resistance Wear rate Microhardness Funding The work was carried out within the framework of the state task of the Federal state budgetary institution of science Khabarovsk Federal Research Center of the Far Eastern Branch of the Russian Academy of Sciences (FSBIS KhFRC FEB RAS), 153 Tikhookeanskaya, Khabarovsk, 680042, Russian Federation, subject number FWUW-2022-0006 Acknowledgements Research were partially conducted at core facility “Structure, mechanical and physical properties of materials”. ABSTRACT Introduction. Metal-ceramic coatings based on titanium silicide are promising for protecting stainless steel AISI 304 from wear, corrosion and high-temperature oxidation. Purpose of the work: to investigate the stainless steel AISI 304 surface layer structure after electrospark deposition in a mixture of titanium granules with silicon powder, and to study oxidation resistance, corrosion resistance and tribotechnical properties of the obtained coatings. Research methodology. Fe-Ti-Si coatings on the stainless steel AISI 304 samples were obtained by electrospark machining with a non-localized electrode consisting of titanium granules and 2.6-6 vol.% mixture of titanium and crystalline silicon powders. Results and discussion: it is shown that a stable positive gain of the cathode is observed when the proportion of silicon in the powder mixture does not exceed 32 vol.%. The phase composition of the coatings includes: a solid solution of chromium in iron, titanium silicide Ti5Si3, titanium and silicon, which is confi rmed by the energy dispersion analysis data. The microhardness of Fe-Ti-Si coatings ranges from 10.05 to 12.86 GPa, which is 5-6 times higher than that of uncoated steel AISI 304. The coeffi cient of friction of the coatings is about 20% lower compared to steel AISI 304 and hovers around 0.71-0.73. Wear tests in dry sliding mode show that Fe-Ti-Si coatings can increase the wear resistance of steel AISI 304 up to 6 times. The oxidation resistance of the coatings at a temperature of 900 ̊С is 7-12 times higher as compared to steel AISI 304. The conducted studies have shown that new electrospark Fe-Ti-Si coatings can increase corrosion resistance, oxidation resistance, microhardness, as well as reduce the coeffi cient of friction and wear rate of the stainless steel AISI 304 surface. For citation: Burkov А.А., KrutikovaV.O. Deposition of titanium silicide on stainless steelAISI 304 surface. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2022, vol. 24, no. 4, pp. 127–137. DOI: 10.17212/1994-6309-2022-24.4127-137. (In Russian). ______ * Corresponding author Burkov Alexander A., Ph.D. (Physics and Mathematics), Senior researcher Institute of Materials Science of the Khabarovsk Scientifi c Center of the Far-Eastern Branch of the Russian Academy of Sciences, 153 Tikhookeanskaya, 680042, Khabarovsk, Russian Federation Tel.: 8 (914) 1618954, e-mail: burkovalex@mail.ru
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