Thermal diffusivity of TBC: Results of a small round robin test and considerations about the effect of the surface preparation and the measuring approach

For this purpose, an inter-laboratory round robin has been promoted for comparing the thermal diffusivity in dependency of the blackening layer deposition technique, the TBC microstructure (in particular porous APS, columnar EB-PVD and PS-PVD™) and the three different experimental set-ups in terms of spectral range and frame rate of the IR cameras, heating source and data reduction.