Synergistic effect of Re-base diffusion barrier and Pt modification on the oxidation behaviour of NiCrAlY coatings

The cyclic oxidation behaviour at 1050 °C and isothermal oxidation behaviour at 1100 °C of a low-diffusion Pt-modified NiCrAlY coating with Re-base diffusion barrier were investigated, compared with conventional NiCrAlY, Pt-free NiCrAlY with Re-base diffusion barrier and Pt-modified NiCrAlY without...

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Bibliographic Details
Published in:Corrosion science 2022-01, Vol.194, p.109919, Article 109919
Main Authors: Xu, M.M., Li, Y.Y., Zhang, C.Y., Jiang, C.Y., Bao, Z.B., Zhu, S.L., Wang, F.H.
Format: Article
Language:English
Subjects:
Aluminum oxide
Buffer inventories
Diffusion barrier
Diffusion barriers
Diffusion coating
Diffusion coatings
Diffusion effects
Elemental interdiffusion
Interdiffusion
NiCrAlY
Oxidation
Oxidation resistance
Platinum
Pt-modification
Synergistic effect
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Summary:The cyclic oxidation behaviour at 1050 °C and isothermal oxidation behaviour at 1100 °C of a low-diffusion Pt-modified NiCrAlY coating with Re-base diffusion barrier were investigated, compared with conventional NiCrAlY, Pt-free NiCrAlY with Re-base diffusion barrier and Pt-modified NiCrAlY without Re-base diffusion barrier coatings. The results revealed that Pt-modified NiCrAlY coating with Re-base diffusion barrier exhibited the best oxidation resistance and lowest interdiffusion extent. The role of Re-base diffusion barrier in inhibiting elemental interdiffusion and the contribution of Pt to the growth rate and adhesion of Al2O3 scale, as well as the long-term stability of Re-base diffusion barrier, are discussed. •A novel coating system, Pt-modified NiCrAlY coating with the Re-based DB layer is fabricated successfully.•The synergistic effect of Re-based DB and Pt modification made NiCrAlY coating exhibits the best oxidation behavior.•Pt modification at surface facilitates the thermal stability of the Re-based DB layer.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2021.109919