2022 №06 (02) DOI of Article
2022 №06 (04)

Automatic Welding 2022 #06
Avtomaticheskaya Svarka (Automatic Welding), #6, 2022, pp. 17-22

Formation of composite coatings by the method of ultrasonic plasma spraying of powders based on the intermetallic TiAl with non-metallic refrectory compounds SiC And Si3N4

Yu.S. Borisov, N.V. Vigilianska, M.V. Kolomytsev, K.V. Iantsevitch, O.M. Burlachenko, T.V. Tsymbalistaya

E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Studies of the structural-phase state, erosion and corrosion resistance of coatings of the systems TiAl–SiC and TiAl–Si3N4, produced by the method of supersonic air-gas plasma spraying, are presented. As materials for spraying, composite powders, produced by the method of mechanic and chemical synthesis based on intermetallic TiAl with the addition of non-metallic refractory compounds SiC and Si3N4 were used. Comparison of the phase composition of the produced coatings of the systems TiAl–SiC and TiAl–Si3N4 with the phase composition of the composite powder after mechanic and chemical synthesis indicates the course of processes of interaction of TiAl with non-metallic refractory compounds, as a result of which the phases of SiC and Si3N4 are not observed in the coating. Due to the presence of strengthening phases in the coatings, the erosion resistance of the composite coatings increases by 1.3...1.5 times as compared to the TiAl intermetallic coating. Electrochemical tests established that the coatings of the systems TiAl–SiC and TiAl–Si3N4 are capable to provide protection of steel, aluminium and titanium base in an environment containing sodium chloride with a 5...155 times increase in resistance. On the basis of the conducted studies of functional properties of the developed composite coatings, the possibility of their use for the protection of parts subjected to erosive wear and corrosion is shown. 15 Ref., 3 Tabl., 4 Fig.
Keywords: intermetallic, non-metallic refractory compound, supersonic air-gas plasma spraying, structure, phase composition, erosive wear, corrosion resistance

Received: 30.05.2022


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