INFLUENCE OF THERMAL DIFFUSIVITY OF SUBSTRATE ON THERMODYNAMIC PROPERTIES OF THE VERY THIN THERMAL BARRIER COATINGS
结构层热扩散系数对超薄涂层热力性能的影响

When thermal barrier coatings (TBCs) are made into laminate in micro/nano scale, the heat transfer theory in macro scale, Fourier heat equation, can not be used. But it can still be used in the substrate under TBCs. In this paper, the temperature field obtained from combining non-Fourier heat conduction model for TBCs and Fourier heat conduction model for substrate is used as the thermal load in the finite element analyses of thermal stress and $J$-integral of an edge crack in the TBCs. Influence of thermal diffusivity of substrate on the TBCs thermodynamic properties (temperature field, thermal stress and $J$-integral) is analyzed. The conclusion is that influence takes effect in the final thermal shock.