La0.8Sr0.2Co0.2Fe0.8O3 (LSCF) coating on Fe-Cr alloy was examined for use as interconnects in SOFC. Thermal cyclic oxidation was conducted on the LSCF coated Fe-Cr alloy to evaluate the interface evolution at LSCF/oxide scale/Fe-Cr alloy. The thickness of oxide scales increased at the LSCF coating/Fe-Cr alloy interfaces with increasing the number of thermal cycles. SIMS depth profiles were obtained after thermal cycling for the LSCF/alloy interfaces region: the oxide scale consisted of (Fe)-Mn-Cr spinel, Cr2O3, and SiO2. Elemental distribution of oxide scales is very similar to the non-coated Fe-Cr alloy. A relatively high diffusivity of oxygen (oxide ions) was observed within the LSCF coating. However, the diffusion of oxygen was blocked by the oxide scales, especially at the Cr2O3 region. The oxide scale growth rates were effectively reduced by the LSCF coating on the Fe-Cr alloy. The effects of the LSCF coating on the oxide scale growth are discussed.

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