Isothermal oxidation behavior of chromium with and without nanon sol-gel CeO_2 coating is studied at 1 000 ℃ in air. Scanning electron microscopy (SEM)and transmission electron microscopy (TEM)are used to examine the sur-face morphology and mierostructure of the oxide films. It is found that ceria coating greatly improves the anti-oxida-tion 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 mass spectrometer (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 growth speed and grain size of Cr_2O_3 film, and this fine grained Cr_2O_3 film probably has better high temperature plasticity, i.e. , oxide film relieves part of the compressive stress by means of creeping. Meanwhile, CeO_2 changes the oxide film growth mechanism from predominant cation outward diffusion to anion in-ward diffusion. XRD and Raman testing results both show the stress declination effect due to nano-CeO_2 application, and their discrepancy in the rare earth effect is analyzed.
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