1. Preparation and oxidation behavior of a novel CeO2-modified chromizing coating
- Author
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SUN, Jian-feng, ZHOU, Yue-bo, and ZHANG, Hai-jun
- Abstract
By using CeO2particles instead of part of Al2O3particles as filler, the CeO2was successfully entrapped into the outer layer of the chromizing coatings on the as-deposited nanocrystalline (NC) and microcrystalline (MC) Ni films using a conventional pack-cementation method at 800 °C. For comparison, chromizing was also performed under the same condition on MC Ni film using Al2O3as filler without CeO2particles. SEM/EDX and TEM results indicate that the refinement of Ni grain and CeO2entrapped into the chromizing coatings refine the grain of the chromizing coating. Oxidation at 900 °C indicates that compared with the CeO2-free chromizing coating, the CeO2-dispersed chromizing coating exhibits an increased oxidation resistance. For the CeO2-dispersed chromizing coating, the refinement of Ni grain size significantly decreases the transient-oxidation scaling rate of the chromizing coatings. Together with this, the CeO2-dispersed chromizing coating formed on NC Ni exhibits a better oxidation resistance.
- Published
- 2013
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