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High-Temperature Oxidation and Oxide Scale Formation in Plasma-Sprayed CoNiCrAlYRe Coatings

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Abstract

MCrAlY coatings are usually adopted to improve the environmental resistance of Ni-based superalloy components of turbine engines against high-temperature oxidation and hot corrosion. In this work, CoNiCrAlYRe coatings were produced by atmospheric plasma spraying. The coatings exhibited relatively low oxygen content and porosity. X-ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy analyses revealed that the high-temperature exposure at 1383 K (1110 °C) promoted the growth of an oxide scale on the top surface being composed of a continuous and dense Al2O3 inner layer followed by an outer mixed layer (Cr2O3 and spinels). The oxide scale was mainly composed of Al2O3, while the formation of mixed oxides occurred at lesser extent. After high-temperature exposure, the formation of internal oxides in some areas reduced the inter-lamellar cohesion, so that a decrease in microhardness was found.

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Authors and Affiliations

  1. Technical Unit of Materials, Casaccia Research Centre, ENEA, Rome, Italy

    Giovanni Di Girolamo (Researcher), Luciano Pilloni (Researcher) & Emanuele Serra (Researcher)

  2. Technical Unit of Materials, Faenza Research Centre, ENEA, Rome, Italy

    Alida Brentari (Researcher)

  3. Technical Unit of Materials, Brindisi Research Centre, ENEA, Brindisi, Italy

    Caterina Blasi (Technical Staff)

Authors
  1. Giovanni Di Girolamo
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  2. Alida Brentari
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  3. Caterina Blasi
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  4. Luciano Pilloni
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  5. Emanuele Serra
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Correspondence to Giovanni Di Girolamo.

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Manuscript submitted February 12, 2014.

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Di Girolamo, G., Brentari, A., Blasi, C. et al. High-Temperature Oxidation and Oxide Scale Formation in Plasma-Sprayed CoNiCrAlYRe Coatings. Metall Mater Trans A 45, 5362–5370 (2014). https://doi.org/10.1007/s11661-014-2509-5

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  • DOI: https://doi.org/10.1007/s11661-014-2509-5

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