Characterization of alumina interfaces in TBC systems
作者： B. A. Pint , K. L. More
DOI: 10.1007/S10853-008-3221-X
关键词: Materials science 、 Metallurgy 、 Diffusion 、 Dopant 、 Coating 、 Chemical engineering 、 Thermal barrier coating 、 Aluminide 、 Interstitial element 、 Grain boundary 、 Superalloy
摘要: Interfacial segregants in thermally grown α-Al2O3 scales formed during high temperature exposure of thermal barrier coating systems reflect the oxygen-active dopants present bond and substrate, such as Y Hf. These diffuse outward segregate to substrate-alumina interface alumina grain boundaries. Related studies suggest that these affect growth mechanical properties alumina-scale; however, characterization segregation on coated superalloy has been limited. Segregation examples evaluated using analytical transmission electron microscopy are given from traditional Pt-modified aluminide coatings newer Pt diffusion coatings. Model used illustrate boundary columnar boundaries not because reverse cations Y2O3-stabilized ZrO2 top coating, interstitial elements substrate likely flux cation dopants. The dynamic nature this oxygen-potential gradient-driven is discussed light observations dopant contents affecting performance.
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