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

Published online by Cambridge University Press:  13 July 2017

Murilo Daniel de Mello Innocentini ,
Victor Dias Rasteira ,
Marek Potoczek ,
Anna Chmielarz  and
Elwira Kocyło
Murilo Daniel de Mello Innocentini*
Affiliation:
Course of Chemical Engineering, University of Ribeirão Preto, UNAERP, Ribeirão Preto, SP 14096-900, Brazil
Victor Dias Rasteira
Affiliation:
Course of Chemical Engineering, University of Ribeirão Preto, UNAERP, Ribeirão Preto, SP 14096-900, Brazil
Marek Potoczek
Affiliation:
Faculty of Chemistry, Rzeszow University of Technology, Rzeszow 35-959, Poland
Anna Chmielarz
Affiliation:
Faculty of Chemistry, Rzeszow University of Technology, Rzeszow 35-959, Poland
Elwira Kocyło
Affiliation:
Faculty of Chemistry, Rzeszow University of Technology, Rzeszow 35-959, Poland
*
a)Address all correspondence to this author. e-mail: muriloinnocentini@yahoo.com.br
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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 (k1) and non-Darcian (k2) 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.

Keywords

porosityceramicfoam
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 14 , 28 July 2017 , pp. 2810 - 2818
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Paolo Colombo

References

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