The Oxidation behavior of an iron-chromium alloy containing yttrium or rare earth elements between 900° and 1200°C |
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Authors: | Yoshikazu Nakamura |
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Affiliation: | (1) Department of Mechanical Engineering, The Defense Academy, Hashirimizu, Yokosuka, Kanagawa, Japan |
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Abstract: | The oxidation behavior of an Iron-15 wt pct Chromium alloy, some containing small additions of yttrium or rare earth elements,
have been observed using a TG and an EPMA method at temperatures between 900° and 1200°C. Yttrium or rare earth element additions
to the Iron-Chromium alloy result in a rapid initial oxidation rate, but decrease the total weight gain of the Iron-Chromium
alloy at the final time of exposure. The line trace obtained indicates that the increased segregation of chromium content
in the inner oxide layer of the alloy containing yttrium or rare earth elements and also shows that the enriched concentration
of yttrium or lanthanum is detected within the chromium oxides which exist near the oxide scale/alloy matrix interface. Yttrium
or rare earth element oxides serve as the sites for the protective chromium oxide scales. |
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