Abstract
The presence of defects such as voids, inter-lamellar porosities or cracks causes a decrease in the effective thermal conductivity of plasma-sprayed coatings as well as a decrease in corresponding mechanical properties, such as the Young’s modulus. In general, the effective properties of thermal spray coatings are thus very different from that of bulk materials and thus have to be quantified to validate in service performances. A complementary approach allowing us to understand the relationships between the microstructure of a coating and its macro-properties is that of Finite Element Modeling (FEM). The case of composite coatings is more complicated still, due to the presence of different materials. In the present study, thermo-mechanical properties of a plasma-sprayed composite coating were estimated by numerical modeling based on FEM. The method applied uses directly cross-sectional micrographs without simplification, using a one-cell per pixel approach. Characteristics such as the thermal conductivity, the Young’s modulus, the Poisson’s ratio and the dilatation coefficient were considered. The example selected was an AlSi/polyester coating used as an abradable seal in the aerospace industry.
Highlights
The use of numerical methods such as Finite Element Modeling (FEM) to estimate the homogenized properties of thermal spray coatings has become a good complementary approach to experimental characterizations
This work was focused on the study of thermo‐mechanical properties of composite coatings, elaborated by atmospheric spraying
This work was focused on plasma the study of thermo-mechanical propertiescoating of composite coatings, abradable seal in aircraft engines was considered
Summary
The use of numerical methods such as Finite Element Modeling (FEM) to estimate the homogenized properties of thermal spray coatings has become a good complementary approach to experimental characterizations. These methods are based on virtual loadings performed on cross-sectional micrographs. Jadhav et al [7] estimated the effective thermal conductivity of PSZ TBC coatings by using calculations performed on cross-sectional micrographs. The in-plane and through-thickness thermal conductivities κx and κy ; The in-plane and through-thickness dilatation coefficients αx and αy ; The 4 values of the above mechanical constitutive law Ex , Ey , νxy , νyx
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