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Structure–processing relationships of freeze-cast iron foams fabricated with various solidification rates and post-casting heat treatment

Published online by Cambridge University Press:  20 July 2020

P.J. Lloreda-Jurado Open the ORCID record for P.J. Lloreda-Jurado [Opens in a new window] ,
S.K. Wilke ,
K. Scotti ,
A. Paúl-Escolano Open the ORCID record for A. Paúl-Escolano [Opens in a new window] ,
D.C. Dunand  and
R. Sepúlveda Open the ORCID record for R. Sepúlveda [Opens in a new window]
P.J. Lloreda-Jurado
Affiliation:
Department of Materials Engineering and Science, E.T.S. de Ingenieros, Universidad de Sevilla, Sevilla41092, Spain Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois60208, USA
S.K. Wilke
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois60208, USA
K. Scotti
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois60208, USA
A. Paúl-Escolano
Affiliation:
Department of Materials Engineering and Science, E.T.S. de Ingenieros, Universidad de Sevilla, Sevilla41092, Spain
D.C. Dunand
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois60208, USA
R. Sepúlveda*
Affiliation:
Department of Materials Engineering and Science, E.T.S. de Ingenieros, Universidad de Sevilla, Sevilla41092, Spain
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Iron foams are potential materials for the production, purification, and recuperation of hydrogen through redox systems. They are inexpensive, recyclable, and environmentally friendly. Nevertheless, iron foams cannot be employed repeatedly for redox cycling at high temperatures because the structure suffers morphological changes and a decrease in the effective porosity. In this work, two different pore structures of Fe-foams fabricated by freeze-casting have been produced: constant (CP) and gradient (GP) pore size. CP Fe-foams were obtained by employing a double-sided cooling technique to minimize gradients in pore width that result when using one-sided, constant cooling solidification techniques. GP Fe-foams were manufactured using a fixed-temperature cold plate. Optical microscopy and X-ray tomography were employed to characterize the pore structure and, for GP Fe-foams, to investigate the effect of redox cycling. After redox cycling, GP Fe-foams exhibited significant pore degradation.

Keywords

Fefoamoptical metallography
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 19: Focus Issue: Porous Metals: From Nano to Macro , 14 October 2020 , pp. 2587 - 2596
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Copyright
Copyright © Materials Research Society 2020

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