期刊
CORROSION SCIENCE
卷 225, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2023.111552
关键词
MCrAlY; Oxidation; High-temperature; Microstructure
The formation process of Al2O3-based duplex oxide scales growing on high velocity oxygen fuel (HVOF) CoN-iCrAlY alloy at 1135 degrees C was investigated. The dual-phase nature of the alloy led to a site-specific oxidation behavior, resulting in the formation of an inhomogeneous duplex oxide scale with widespread embedded mixed oxides. The early-stage formation of these oxides was mainly influenced by grain boundary proximity, while the subsequent nucleation/growth of mixed oxides was enabled by the presence of cationic impurities in the scale, allowing for continuous cationic diffusion of non-aluminium elements.
The formation process of Al2O3-based duplex oxide scales growing on high velocity oxygen fuel (HVOF) CoN-iCrAlY alloy was investigated at 1135 degrees C. The dual-phase nature of the alloy originated a site-specific oxidation behaviour that facilitated the formation of an inhomogeneous duplex oxide scale with widespread embedded mixed oxides. The early-stage formation of these oxides was explained by a modified Gaussian diffusion model where grain boundary proximity is the main variable. The subsequent nucleation/growth of mixed oxides with oxidation time was attributed to continuous cationic diffusion of non-aluminium elements across the scale enabled by the presence of cationic impurities in the scale.
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