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High Temperature Oxidation and Microstructural Evolution of Modified MCrAlY Coatings

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Abstract

Thermal sprayed MCrAlY coatings are widely used as a bond coat in thermal barrier systems to protect the substrate from corrosion and high temperature oxidation and to improve the compatibility between the ceramic top coat and metallic substrate. In this paper, the high temperature oxidation resistance of MCrAlY coatings with modified compositions was evaluated; in particular, the effect of the addition of reactive and refractory elements (Ta, Re, Si, and Hf) was investigated. MCrAlY coatings were obtained by high velocity oxygen fuel spray and vacuum plasma spray techniques; samples were exposed to air at 1423 K (1150 °C) and the oxidation kinetics were evaluated by measuring the thickness of the thermally grown oxide (TGO) scale at several exposure times. Experimental data confirmed that the oxidation resistance of MCrAlY coatings is strictly related to the amount of the reactive and refractory elements in the starting powders and that a thorough understanding of the microstructural modifications taking place during oxidation is essential for controlling TGO growth and thermal barriers’ durability.

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Authors and Affiliations

  1. INSTM Reference Laboratory for Engineering of Surface Treatments, Department of Chemical Engineering Materials Environment, University of Rome “La Sapienza”, Via Eudossiana 18, 00184, Rome, Italy

    Giovanni Pulci (Researcher), Jacopo Tirillò (Researcher), Francesco Marra (Researcher), Fabrizio Sarasini (Researcher), Teodoro Valente (Professor) & Cecilia Bartuli (Associate Professor)

  2. Centro Sviluppo Materiali S.p.A., Via di Castel Romano, 100, 00128, Rome, Italy

    Alessandra Bellucci (Researcher)

Authors
  1. Giovanni Pulci
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  2. Jacopo Tirillò
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  3. Francesco Marra
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  4. Fabrizio Sarasini
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  5. Alessandra Bellucci
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  6. Teodoro Valente
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  7. Cecilia Bartuli
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Corresponding author

Correspondence to Cecilia Bartuli.

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Manuscript submitted May 8, 2013.

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Pulci, G., Tirillò, J., Marra, F. et al. High Temperature Oxidation and Microstructural Evolution of Modified MCrAlY Coatings. Metall Mater Trans A 45, 1401–1408 (2014). https://doi.org/10.1007/s11661-013-2086-z

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  • DOI: https://doi.org/10.1007/s11661-013-2086-z

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