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Freeze cast alumina foams with hierarchical strut porosity

Thursday (25.10.2018)
12:10 - 12:30
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High-porosity replica foams with additional strut porosity were manufactured by a combination of sponge template coating and freeze casting processing. Several green foam series were obtained under variation of the type of thickening agent, concentration and/or the solid load of alumina within the coating slurry.

The total porosity was controlled with solid load: a decrease in alumina powder amount in the slurry lead to an increase in porosity. The lower limit of alumina load is ~ 20 vol. %; foams processed at this low amount were no more manageable.

Variations of the freeze casting parameters lead to a strut porosity of up to 40 % and the pores were in the range between 35 µm and 60 µm. Foams with a total porosity of 90 % were found to have a compression strength of at least 1.4 MPa.

Kathleen Dammler
Otto von Guericke University Magdeburg
Additional Authors:
  • Katja Schelm
    Otto von Guericke University Magdeburg
  • Dr. Tobias Fey
    University of Erlangen-Nürnberg
  • Dr. Ulf Betke
    Otto von Guericke University Magdeburg
  • Prof. Dr. Michael Scheffler
    Otto von Guericke University Magdeburg