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| Influence of Nanometric Ceria Sol-gel Coating on Oxidation Behavior of Chromium at 1000�� |
| JIN Hui-Ming Lin-Nan ZHANG |
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Abstract Isothermal oxidation behavior of chromium with and without nanometric sol-gel CeO2 coating is studied at 1000�� in air. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) are used to examine the surface morphology and microstructure of their oxide films. It is found that ceria coating greatly improves the anti-oxidation property of chromium. Laser Raman spectrometer and X-ray diffraction spectrometer (XRD) are also used to study the stress level in oxide films formed on ceria-coated and ceria-free Cr. Secondary ion massive spectrum (SIMS) is used to examine Cr, O and Ce element distribution in depth in oxide films. Results show that nano-ceria application greatly reduces the growing speed and grain size of Cr2O3 film, and his fine grain-sized Cr2O3 film probably has better high temperature plasticity, i.e. oxide film relieves part of the compressive stress by means of creeping. Meanwhile, CeO2 changes the oxide film growing mechanism from predominant cation outward diffusion to anion inward diffusion. XRD and Raman testing results both show the stress declination effect due to nano-CeO2 application, and their discrepancy is analyzed concerning to the rare earth effect.
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Received: 30 April 2008
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Corresponding Authors:
JIN Hui-Ming
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2009, Vol. 16 
