Supercritical Debinding of Injection Molded Ceramics |
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| Authors: | Thierry Chartier † Marc Ferrato †‡ Jean F Baumard† |
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| Affiliation: | Laboratoire de Materiaux Ceramiques et Traitment de Surface-Unite de Recherche Associee, CNRS 320, ENSCI, 87065 Limoges, Coudamy S.A., 87170 Isle, France Coudamy S.A., 87170 Isle, France |
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| Abstract: | Extraction of organic additives from extrusion-molded cylinders of alumina by a supercritical fluid is investigated. Hildebrand parameters alone are not adequate to predict conditions for optimal polymer extraction with supercritical CO2. The results obtained with two models developed for the kinetics of binder extraction suggest that polymer extraction from green samples is controlled by diffusion without development of a reaction front. The solubility and diffusivity of polymers both affect the extraction rate, with opposite pressure and temperature dependencies. |
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