Abstract
A continuous and thin Al2O3 layer would act as an infiltration barrier to diminish the growth of spinels in thermal barrier coating systems. Therefore, isothermal oxidation of normal NiCrAlY/YSZ, nano NiCrAlY/YSZ and nano NiCrAlY/YSZ/nano Al2O3 coatings was investigated at 1000°C. These samples were then subjected to thermal cycles at 1150°C. The microstructural characterisation showed that the spinel growth in the nano NiCrAlY/YSZ/nano Al2O3 coating was much lower than the other coatings. This observation can be related to the formation of a fully continuous Al2O3 layer on the nano NiCrAlY coating during pre-oxidation at 1000°C and also to the presence of a nano Al2O3 layer over the YSZ coating.
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