Investigation of Thermal Stresses in Micro and Nano-Structured Thermal Barrier Coatings

Induced thermal stresses during quenching of micro and nano-structured ZrO2 coatings from 1250oC to 20oC has been modeled using finite element method. Thermal stresses distribution of coatings has been also calculated. Results show that thermal stress in x-direction is zero at the edges of both micro and nano-structured samples. It is also concluded that shear thermal stress of nano-structured coatings is 33% lower than its value in micro ones. In addition، shear stresses in TGO layer were also calculated and the results show these stresses are 35% lower than micro ones. Modeling results validates long life time of nano-structured coatings.