Funct. Mater. 2025; 32 (2): 203-210.

doi:https://doi.org/10.15407/fm32.02.203

Development of Ti-Al-Cr-based thermobarrier coatings on titanium alloys

V.L.Syrovatka1, V.E.Sheludko1, A.V.Minitskyi2

1Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, 3 Omelyana Pritsaka (Krzhyzhanovsky) Str., 03142 Kyiv, Ukraine
2National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", 37 Beresteysky Ave., 03056 Kyiv, Ukraine

Abstract: 

The behavior of Ti-Al-Cr heat-resistant coatings during high-temperature oxidation was shown to depend on the structure of the substrate, which, in turn, defines the nature of the diffusion processes occurring at the coating-substrate boundary. When the substrate was made from titanium-rich alloys, active diffusion of Al and Cr from the coating, as well as Ti into the coating was observed. Thus, due to the change in the Al/Ti activity ratio, a mixed TiO2 and Al2O3< oxide layer is formed on the coating surface. In the case of γ-TiAl substrate, only an Al2O3< oxide layer is formed on the surface of the TiAlCr coating.

Keywords: 
thermal barrier coatings, titanium aluminides, oxidation, zirconium dioxide

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