Optimization selection of the thermal conductivity of the top ceramic layer in the Double-Ceramic-Layer Thermal Barrier Coatings based on the finite element analysis of thermal insulation

The reasonable range of λTC1 was investigated based on the temperature calculated and the sintering temperature of each layer. If the thickness ratio of two ceramic layers is 150 μm-150 μm, the reasonable range of λ is from 0.492 Wm− 1 K− 1 to 1.654 Wm− 1 K− 1. The reasonable range of λTC1 was investigated with considering different thicknesses of the TC1 layer. The relationship between the reasonable range of λTC1 and the thickness of TC1 (HTC1), which is shown by the safe region of λTC1-HTC1, is established.