The effects of sample surface treatments on laser flash thermal diffusivity measurements

Studies of the sintering kinetics of thick thermal barrier coatings by thermal diffusivity measurements

“…17 Since measurements have been carried out in vacuum, the only correction applied to the experimental data was related to the radiative losses taking place at high temperature. In this specific case, the Cowan method for reducing the data has been used.…”

Pulse thermography to assess thermal diffusivity in semitransparent materials.

“…At these temperatures the radiative heat transfer becomes more and more relevant. The effect of blackening surfaces by a thin layer of graphite is considered [4]. Experiments are carried out at ambient temperature by means of a thermographic camera, at higher temperature in vacuum until 1200 °C and in argon atmosphere until 1000 °C.…”

IR thermography applied to flash experiments of semitransparent TBCs

“…1 a gas turbine system for electrical power production under maintenance). Typically, they are metalceramic multi-layers structures made up of a yttria partially stabilized zirconia (7)(8) The refractory ceramic porous layer can reduce the temperature of the metallic substrate by 30°C to 100°C, depending on the thickness and on the specific microstructural properties of the coating. Under typical working conditions, gas turbines are subjected to several switching on and off with consequent cyclic variations of temperature of TBCs, from ambient to working temperature (>1000 °C).…”

“…The effects of blackening the surfaces by a thin layer of graphite is considered [8]. The role of heat conduction and radiation is also taken into account trying to separate each contribution.…”