Thermal Conductivity Imaging of Thermal Barrier Coatings

Thermal conductivity images of thermal barrier coatings are measured using time‐domain thermoreflectance at a single delay time with micron‐scale resolution. We find that the thermal conductivity of electron‐beam physical vapor deposited 8 wt% yttria‐stablized zirconia coatings for heat flow along both the through‐thickness and in‐plane directions is isotropic and uniform throughout the depth of the coating.