Microstéréolithographie de céramiques

Abstract : Microstereolithography is a microfabrication process that allows the manufacturing of complex three-dimensional objects with a volume of a few cubic millimeters. The princip le is based on the stacking-up of photopolymerized lay ers. This work deals with the adaptation of this process to composite and ceramic materials. In order to do this, a fluid alumina powder suspension has been formulated and characterized. This suspension allowed the fabrication of microparts illutrasting possible application fields such as micromechanics, microrobotics, or microfluidics. The development and fabrication of a scrapping system adapted to microstereolithography's needs allowed the shaping of highly viscous photomaterials, especially highly loaded alumina suspensions. Objects made by this way stand without damage a thermal treatment of debinding/sintering, in order to remove polymer and densify ceramic. The resulting parts -in pure alumina- can show good chemical, thermal, and mechanical properties. Then, a parallel set-up based on Michelson interferometer was developped to study the photopolymerization kinetic with an inhibiting agent, the oxygen. A model which can predict polymerized thickness and reaction advancement was conceived.
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Christophe Provin. Microstéréolithographie de céramiques. Alimentation et Nutrition. Institut National Polytechnique de Lorraine, 2002. Français. ⟨NNT : 2002INPL101N⟩. ⟨tel-01749728⟩

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