Abstract(s) :

(Anglais) Interest in absorption X-ray microtomography for solving technological or research problems is growing since new equipments propose significantly increased resolutions. This Non Destructive Technique (NDT) allows virtual 3 dimensions reconstruction and further 2 dimensions sliding of any plan across the investigated parts. In comparison to conventional radiography, the microtomography presents a much higher resolution (a few micrometers) and the advantage of a 3D positioning of any information instead of plan projection. Therefore this technique is highly efficient for identification of defects (cracks, pores, inclusions, debondings…), diffuse heterogeneities (density, chemical gradients…), or for any internal measurement or positioning control in complex systems. In addition, in situ transformations can be followed in a live proves. Our work shows different problems (for industry and research) that were solved using microtomography. Among these : Industry applications - Geometrical control memory alloy tubes (external diameter : 0.6 ; internal diameter 0.4 mm) for medical applications. - Geometrical control and defect identification in fast prototyped ceramic teeth. Research - Quantitative analysis of density gradients in green ceramics their evolution and during sintering cycle. - Investigation of porous ceramics and low density refractories.