If I have a ceramic coating and I want to measure the thermal conductivity, which thermal diffusivity model should I adopt for calculation?
If I have a metallic coating?
If I have a composite ?
The models are like
1) Adiabatic minus pulse correction
2) Adiabatic plus pulse correction
3) Radiation minus pulse correction
4) Radiation plus pulse correction
5) Cowan minus pulse correction
6) Cowan plus pulse correction
All depends. The corrections regarding pulse concern the samples relatively thin in which the laser flash can not be treated as instantaneous. The radiations corrections, inversely, concern the sample relatively thick which radiate from the sides. As far as the coating on substrate case is concerned you can get an inspiration from one of recent papers from my group: https://www.researchgate.net/publication/233844150_Thermal_diffusivity_and_conductivity_of_yttria_stabilized_zirconia_coatings_obtained_by_suspension_plasma_spraying_?ev=prf_pub
The rests of the mentioned corrections are also available as papers in RG among my contributions in period 1982-1990.
Article Thermal diffusivity and conductivity of yttria stabilized zi...
Dear Lech Pawlowski, If I have a free standing coating of around 700 micron then which model should I use. In general, for a coating having 700 micron thickness whether radiation from the sides are significant ?
700 µm seems to be relatively thick and probably correction for side radiation should be applied at higher temperatures. You can start without this correction and use only Parker formula and then apply the correction and compare the obtained diffusivities.
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