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The influence of superficially applied oxide powders on the high-temperature oxidation behavior of Cr2O3-forming alloys

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Abstract

The effects of superficially applied CeO2, mixed rare earth oxides, Co3O4, and Cr2O3 powders on the isothermal and cyclic oxidation of Ni-Cr alloys and the effects of CeO2 and MgO powders on the isothermal oxidation of Fe-25 wt.% Cr have been studied over the temperature range 940–1150°C in pure oxygen and dry air. The rates of oxidation of both the Ni- and Fe-base alloys were markedly reduced by the application of CeO2 powder. The presence of CeO2 also improved the scale adherence and resulted in marked changes in the oxidation morphology. The presence of Co3O4 or Cr2O3 powders on Ni-Cr alloys or MgO on Fe-Cr also produced changes in the oxidation morphology but did not decrease the rate of oxidation. These results are interpreted in terms of the influence of the oxide powders on the development of scale microstructure and their effectiveness in decreasing grain boundary transport in Cr2O3.

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Authors and Affiliations

  1. Smith Tool, 92713, Irvine, California

    G. M. Ecer

  2. Colt Industries-Crucible Incorporated Midland, 15059, Pennsylvania

    R. B. Singh

  3. University of Pittsburgh, 15261, Pittsburgh, Pennsylvania

    G. H. Meier

Authors
  1. G. M. Ecer
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  2. R. B. Singh
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  3. G. H. Meier
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Additional information

This paper is based in part on the Ph.D. thesis of G. M. Ecer (1975) and in part on the M.S. thesis of R. B. Singh (1977).

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Ecer, G.M., Singh, R.B. & Meier, G.H. The influence of superficially applied oxide powders on the high-temperature oxidation behavior of Cr2O3-forming alloys. Oxid Met 18, 55–81 (1982). https://doi.org/10.1007/BF00656095

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  • DOI: https://doi.org/10.1007/BF00656095

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