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The Effect of Water Vapor on the Oxidation Behavior of CVD Iron-Aluminide Coatings

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Abstract

The oxidation behavior of iron-aluminide coatings, Fe3Al or (Fe,Ni)3Al, produced by chemical-vapor deposition (CVD) was studied in the temperature range of 700–800°C in air + 10 vol.% H2O. A typical ferritic steel, Fe–9Cr–1Mo, and an austenitic stainless steel, 304L, were coated. For both substrates, the as-deposited coating consisted of a thin (<5μm), Al-rich outer layer above a thicker (30–50 μm), lower-Al-content inner layer. In addition to coated and uncoated Fe–9Cr–1Mo and 304L, cast Fe–Al model alloys with similar Al contents (13–20 at.%) to the CVD coatings were included in the oxidation exposures for comparison. The specimens were cycled to 1000 1 hr cycles at 700°C and 500 1 hr cycles at 800°C, respectively. The CVD coating specimens showed excellent performance in the water-vapor environment at both temperatures, while the uncoated alloys were severely attacked. These results suggest that an aluminide coating can substantially improve resistance to water-vapor attack under these conditions.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Tennessee Technological University, Cookeville, TN, 38505-0001, USA

    Y. Zhang

  2. Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831-6156, USA

    B. A. Pint, J. A. Haynes & P. F. Tortorelli

Authors
  1. Y. Zhang
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  2. B. A. Pint
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  3. J. A. Haynes
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  4. P. F. Tortorelli
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Correspondence to Y. Zhang.

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Zhang, Y., Pint, B.A., Haynes, J.A. et al. The Effect of Water Vapor on the Oxidation Behavior of CVD Iron-Aluminide Coatings. Oxidation of Metals 62, 103–120 (2004). https://doi.org/10.1023/B:OXID.0000038788.02094.cb

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  • DOI: https://doi.org/10.1023/B:OXID.0000038788.02094.cb

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