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Behavior of oxide films on high-temperature alloys in carbonaceous gas atmospheres

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Abstract

Formation and deterioration of oxide films on several contemporary high-temperature alloys was studied in various carbonaceous gas atmospheres. Scanning electron microscopy and metallographic examination were applied to films on Fe-Cr-Ni and Ni-Cr-Al type alloy compositions exposed in CH 4/H2 and CO/CO2 atmospheres at temperatures up to 900° C and pressures up to 900 psi (6.2 × 106 N/m2). The effects of various preoxidation treatments were evaluated. Reduction of certain oxide phases is observed to promote catalytic gas decomposition. Al2O3 components in the films are observed to be stable under the reducing conditions experienced. Carbon uptake by various alloys is found to be quite sensitive to surface finish, with an observed increase in penetration with surface roughness.

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Authors and Affiliations

  1. Materials Group, Department of Mechanical Engineering, Naval Postgraduate School, Monterey, California

    J. Perkins (Associate Professor)

  2. Metallurgy Division, Lawrence Livermore Laboratory, Livermore, California

    A. Goldberg (Senior Scientist)

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  1. J. Perkins
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  2. A. Goldberg
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Perkins, J., Goldberg, A. Behavior of oxide films on high-temperature alloys in carbonaceous gas atmospheres. Oxid Met 11, 23–56 (1977). https://doi.org/10.1007/BF00611601

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  • DOI: https://doi.org/10.1007/BF00611601

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