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Continuous slurry foaming: a new method for manufacturing ceramic foams

Schäumen aus einer kontinuierlichen Aufschlämmung: Ein neues Verfahren zur Herstellung von Schaumkeramik
: Luthardt, F.; Adler, J.

Stephani, G.; Hipke, T.; Scheffler, M.; Adler, J. ; Deutsche Gesellschaft für Materialkunde e.V. -DGM-, Oberursel; Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung -IFAM-, Dresden; Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik -IWU-, Chemnitz:
International Conference on Cellular Materials, CellMat 2010. Proceedings : Held in Dresden, Germany from 27-29 Oct 2010
Dresden, 2010
International Conference on Cellular Materials (CellMat) <2010, Dresden>
Fraunhofer IKTS ()

Ceramic foams can be produced with different methods, where every method exhibits typical benefits and characteristic foam morphologies. The authors have been developing a new continuous direct foaming method that produces foam in a simple and continuous way. Thereby the foam is produced during the flow of the prepared slurry through static mixing elements, where the slurry is mixed with gas that is pressed through a porous membrane surrounding the static mixing elements. The wet foam is filled into molds, dried and sintered. The manufacturing as well as disproportionation processes of the foam in its wet state determine the resulting foam morphology that can exhibit closed or open cells with pore sizes between 50 micron and 5 mm and porosities up to 90 %. As a benefit in opposition to other foaming methods, this method allows the combination of the wet foam within another foam structure on a macroscopic level. These foams are termed hybrid foams.