Effect of reactive elements in MCrAlX bond coat for durability improvement of thermal barrier coatings

The effects of reactive elements (RE) in MCrAlX alloy (M: Metals, X: RE) as the bond coat for thermal barrier coatings durability were investigated by both experimental evaluation and density functional theory (DFT) calculations. Cyclic oxidation tests showed that the lifetime of the sample with Y,...

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Bibliographic Details
Published in:Corrosion science 2024-08, Vol.237, p.112329, Article 112329
Main Authors: Negami, Masahiro, Morihashi, Ryo, Yoshino, Tessei, Sahara, Ryoji, Yamabe-Mitarai, Yoko
Format: Article
Language:English
Subjects:
First principles calculation
High temperature oxidation
Reactive elements
Thermal barrier coatings
Thermally grown oxide
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Summary:The effects of reactive elements (RE) in MCrAlX alloy (M: Metals, X: RE) as the bond coat for thermal barrier coatings durability were investigated by both experimental evaluation and density functional theory (DFT) calculations. Cyclic oxidation tests showed that the lifetime of the sample with Y, Hf, and Si as RE displayed approximately twice of the sample with Y only. Furthermore, the interface energies between oxide (α-Al2O3) and bond coat with various RE (Si, Sc, Ti, Y, Zr, Hf, La, and Ce) were calculated by DFT. DFT results indicate that Hf and Si doping effectively reduce the interface energy. [Display omitted] •Cyclic oxidation life of thermal barrier coating was experimentally evaluated.•Hf and Si addition to bond coat improved the durability of thermal barrier coatings.•Reactive elements effects were evaluated by density functional theory calculations.•Origin of reactive elements effects on the interfacial energy is clarified.•Doped Si and Hf at the interface effectively reduce the interface energies.
ISSN:0010-938X
DOI:10.1016/j.corsci.2024.112329