Thick thermal barrier coatings

Modelling of thermal conductivity of porous materials: application to thick thermal barrier coatings

“…These could be considered as the main mechanisms causing the increase of thermal conductivity as pointed by microstructural analysis. 30 Moreover, for thick TBC an other possible contribution to the increase of thermal conductivity could be ascribed to changes of the pore structure caused by the residual stress relaxation at high temperature as reported by Schwingel et al 31 even if in this specific case, no clear evidence of any significant stress relaxation has been observed during specific heat measurements. 30 In order to explain semi-quantitatively the thermal conductivity variations observed between the first and the third cycle for the three as-sprayed samples, modelling for porous materials was applied using IA and MIP results as input data.…”