International audienceSemitransparent materials, like silica or alumina, are highly used by high-temperature industries as refractory materials in blast or glass-making furnaces, first for their good mechanical properties. The knowledge of their radiative properties is also essential to improve thermal transfers. However, characterizing experimentally the high temperature dependence of radiative properties of semitransparent ceramic materials remains nowadays a difficult task. This paper reports a hybrid methodology to address this problem. The approach relies on two or more experimental emittance measurements, performed by infrared spectroscopy on samples of increasing thicknesses, and application of emittance models. The efficiency of the method is illustrated by using experimental data obtained on Jargal M samples, an industrial electrofused ceramic, and a virtual media built from X-ray computed tomography images. Two emittance models, a model from the literature and a new model proposed in this work, are selected to be a part of the hybrid methodology, since they allow retrieving complementary information on the optical and scattering properties of the materials. Both models show a good efficiency to reproduce emittance behavior of the industrial and virtual samples. Parameters are extracted from these models to improve our knowledge of the characteristic thickness of radiative transfer into semitransparent materials and the emittance value of semi-infinite media
International audienceThis work aims at investigating the mechanical behaviour of a zirconia-rich fused-cast refractory at high temperature ( C). The geometry of the zirconia phase was analysed on samples having contents of amorphous phase ranging from 12 to 24% in volume, from 3D images obtained using the X-ray computed micro-tomography technique. The sharp intrication of the dendrites creates a continous zirconia skeleton which was characterized experimentally. Results at high temperature show that deformation is controlled by zirconia, whereas the amorphous phase does not play any structural role. Finite-element simulations have been carried out to predict the creep behaviour of the aggregate. The creep law of the zirconia skeleton was identified by an inverse method from a creep test at C and from the 3D real morphology of the dendritic zirconia structure. Simulation results confirm that the rheology of the aggregate is controlled by the zirconia skeleton and a good agreement was observed between numerical creep tests and experiments
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