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Abstract

The effects of Ce and CeO₂ alloying additions on the oxidation behaviour of Fe–Cr alloys have been investigated at 1273 K in 13·33 kPa (0·13 bar) O₂. The Ce and CeO₂ markedly affected the oxidation characteristics of the Fe–Cr alloys, causing enhanced oxide nucleation, modifications of scale morphologies, decreased overall rates of alloy oxidation, and enhanced scale/alloy adhesion. The beneficial effects imparted by Ce and CeO₂ increased with both increasing additions of Ce at constant Cr content and increasing additions of Cr at a specific Ce content. The presence of alloy S impurity deleteriously affected the oxidation characteristics of Fe–Cr alloys. This was markedly decreased by Ce alloying additions. The mechanisms by which the beneficial effects of Ce and CeO₂ occur are discussed.

MST/836

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Use of cerium and cerium oxide additions to improve high temperature oxidation behaviour of Fe–Cr alloys

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