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| MECHANISM OF THE EFFECT OF Ce ON OXIDATION-RESISTANCE OF Fe-l5Cr ALLOY |
| Li Bei Gao Huaisun and Jang Liping (Baotou Rare Earth Research Instiute) |
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Abstract The oxidation behaviour of Fe-15 Cr and Fe-15Cr-0.3Ce alloys at 1000℃ and 1100℃ has been investigated by means of vacuum-thermo-microbalance, scanning electromicroscope and X-ray diffractometer.Experimental results show that Fe-rich oxide nodules are formed rapidly on the surface of Fe-15Cr alloy owing to deformation and breakdown of Cr_2O_3 film on this alloy. A positive deviation of oxidation kinetics from parabolic law occurs as a result of repeated breaks of weight-gain curves. If the alloy contains Ce, the deformation of the Cr_2O_3 film and the formation of Fe-rich oxide nodules are inhibited, and thus more smooth weight-gain curves and smaller oxidation rates are obtained.lt is found that Ce promotes growth of columnar crystal grains and enhances preferred orientation of the crystal grains in the Cr_2O_3 film. These facts suggest that diffusion of Cr ions in the film and lateral growth of the film can be affected by Ce ions.It might be thought that the above mentioned findings are associated with the decrease of growth stress and deformation of the Cr_2O_3 film.
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Received: 25 June 1986
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[6] Goligthly, F. A.; Stott, F. H.; Wood, G. C., Oxid. Met., 10, 163 (1976)
[7] Kubaschewski, O.; Hopkins, B, E., Oxidation of Metals and Alloys (second edition), London, 9 (1962) |
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