| Résumé | Supercritical CO2 debinding has been described as a clean and environmentally friendly alternative to other debinding routes. The claims are that SC-CO2 should prevent oxidation, lead to less defects and reduce the debinding time. This appears therefore as the process of choice for titanium MIM since this material is very sensitive to contamination by interstitial elements during the whole process which, in turn, affects the mechanical properties and integrity required for demanding sectors such as biomedical. In this paper, the potential benefits of using the SC-CO2 technology for titanium MIM parts have been evaluated as a replacement for the conventional immersion in solvent process. The efficiency of the debinding processes (SC-CO2 and hexane) as well as their effect on final properties of titanium MIM dental implants, and in particular on interstitials composition (C wt.%, O wt.% and N wt.%) and dimensional variations will be presented and discussed, as a function of the processing debinding parameters. |
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