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Evaluation of the pore morphology formation of the Freeze Foaming process by in situ computed tomography

Auswertung der Porenmorphologie-Entstehung des Gefrierschäumverfahrens durch in-situ Computer Tomographie
: Ahlhelm, Matthias; Werner, David; Maier, Johanna; Abel, Johannes; Behnisch, Thomas; Moritz, Tassilo; Michaelis, Alexander; Gude, Maik

Postprint urn:nbn:de:0011-n-4871696 (747 KByte PDF)
MD5 Fingerprint: dd281e37ef594551f0f2b000103f0b85
Erstellt am: 01.05.2019

Journal of the European Ceramic Society 38 (2018), Nr.9, S.3369-3378
ISSN: 0955-2219
Deutsche Forschungsgemeinschaft DFG
Erarbeitung der Gesetzmäßigkeiten der Schaumstrukturbildung im Gefrierschäumprozess biokompatibler Keramikschäume
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IKTS ()
freeze foaming; bioceramics; foaming process; in-situ CT; none destructive testing

The so-called Freeze Foaming method aims at manufacturing ceramic cellular scaffolds for diverse applications. One application is dedicated to potential bone replacement material featuring open, micro and interconnected porosity. However, the main challenges of this foaming method is to achieve a homogeneous pore morphology. In a current project, the authors throw light on the bubble/pore and strut formation of this process by in situ computed tomography. This allows for evaluating varying process parameter’s effects on the growth of the ceramic foam during the foaming process. As first result and basis for CT analysis, a stable and reproducible model suspension was developed which resulted in reproducible foam structures. In dependence of selected process parameters like pressure reduction rate or air content in the ceramic suspension resulting Freeze Foams became adjustable with regard to their pore morphology. Pore size and distribution data as well as the porosity were characterized and evaluated accordingly.