For high temperature reactors or construction materials, thermal barriers are usually fabricated with porous materials. Their thermal properties depend on complex physical or physico-chemical phenomena (solid conduction, gas conduction, thermal contact resistances, gas convection in pores, surface reaction, surface radiation...). They have to be taken into account in the different theoretical models. The normalised measurement methods for thermal properties need long time stabilisation and brick materials. The evaluation with small amount of materials using simple setup is now possible with transient methods. They are helpful to generate a database for the use in thermal modelling. The objectives of this work are focused on the measurements of thermal properties with a transient method on powder blends (the sensor used is a plane and circular probe which is a heating element etched on a polymer Kapton). Nevertheless, when it is impossible to evaluate some parameters used in these different theoretical models, a minimisation method allows the evaluation of thermal properties models with complex physical or physicochemical phenomena.
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