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Physical, fluid dynamic and mechanical properties of alumina gel-cast foams manufactured using agarose or ovalbumin as gelling agents

  • Murilo Daniel de Mello Innocentini (a1), Victor Dias Rasteira (a1), Marek Potoczek (a2), Anna Chmielarz (a2) and Elwira Kocyło (a2)...
Abstract
Abstract

Alumina gel-cast foams were manufactured in a broad total porosity range (43–86%) by using agarose or ovalbumin as gelling agents. The foams were examined in terms of microstructural, permeability, and mechanical properties. For the achieved open porosity level (19–85%), the mean cell size (19–375 µm), and mean window size (8–77 µm) of the alumina foams manufactured using ovalbumin were slightly wider than those obtained using agarose (34–262 µm and 18–33 µm, respectively). By using different contents of agarose (0.3–1 wt%) or albumin (5 wt%) and solids (30–45.9 wt%), it was possible to vary the foaming yield from 1.6 to 4.4 and produce bodies with a very wide permeability level that included several classes of porous ceramics. Darcian (k 1) and non-Darcian (k 2) permeability coefficients displayed values in the range 3.2 × 10−18 to 4.3 × 10−9 m2 and 1.8 × 10−18 to 6.5 × 10−5 m respectively. Compressive strength of bodies was dependent upon the porosity level, with a variation of 8.5–149.7 MPa.

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a) Address all correspondence to this author. e-mail: muriloinnocentini@yahoo.com.br
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Contributing Editor: Paolo Colombo

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