The Paton Welding Journal, 2022, №08



2022 №08 (03)

DOI of Article 10.37434/tpwj2022.08.04

2022 №08 (05)

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The Paton Welding Journal, 2022, #8, 25-31 pages

Investigation of heat resistance of plasma coatings from TiAl intermetallic with application of parametric oxidation diagram

Yu.S. Borysov, A.L. Borysova, O.P. Gryshchenko, T.V. Tsymbalista, M.A. Vasylkivska

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

Abstract
Heat resistance of plasma coatings from TiAl intermetallic was studied by heating in air environment at temperatures of 700…1000 °С with determination of the change of sample weight and plotting of the parametric diagram of heat resistance, as well as phase composition of coatings before and after testing. It was determined that titanium oxide TiAl (TiO2) is the main product of coating oxidation, and at higher temperatures it is a mixture of TiO2 and Аl2O3 oxides. Titanium nitride (TiN), TiO, Ti2O, Ti2O3 oxides and Ti3Al intermetallic were found in the scale composition. Kinetic dependencies of oxidation process were used to perform calculations of heat resistance parameters for temperatures of 700…1000 °С that allows assessment of durability of TiAl intermetallic coating for any temperatures up to 1000 °С. Calculations of average oxidation rate showed that heat resistance diagrams can be used to determine the main heat resistance characteristics: specifi c weight loss and uniform corrosion depth. 12 Ref., 2 Tabl., 6 Fig.
Keywords: plasma spraying, intermetallics, Ti–Al system, heat resistance, oxidation, parameteric diagram

Received: 16.06.2022
Accepted: 17.10.2022

References

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