Abstract
In order to characterize thermophysical properties of high conductivity metallic materials, this work proposes a novel experimental apparatus supported by an analytical solution and a numerical simulation. The experimental set-up measures simultaneously the temperature evolutions on both the front and rear faces of a sample using a single detector following the high-speed thermography principle through a dedicated system of six mirrors. This innovative configuration allows to reach high temperatures in a controlled atmosphere without pollution by contact. A transient 2D-axisymmetric model is developed, considering heat transfer along the radius and thickness directions. In a first stage, the model is compared to a finite element model, then the estimation procedure is validated by a noised direct model. Afterwards, the experimental temperatures versus time are used to estimate the thermal diffusivity of pure iron and stainless steel 304 in the solid state at high temperature in a pollution-free environment. The estimated values for a temperature range between 1300 K and 1600 K are then compared with published data.
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