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

P. J. Lloreda-Jurado; S. K. Wilke; K. Scotti; A. Paúl-Escolano; D. C. Dunand; R. Sepúlveda

doi:10.1557/jmr.2020.175

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

P. J. Lloreda-Jurado, S. K. Wilke, K. Scotti, A. Paúl-Escolano, D. C. Dunand, R. Sepúlveda^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

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 fixederature 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.

Original language	English (US)
Pages (from-to)	2587-2596
Number of pages	10
Journal	Journal of Materials Research
Volume	35
Issue number	19
DOIs	https://doi.org/10.1557/jmr.2020.175
State	Published - Oct 14 2020

Funding

Financial support for this work has been provided by the Spanish Ministerio de Economía, Industria y Competitividad (MINECO), through the project MAT2016-76713-P, and by the U.S. National Science Foundation (NSF CMMI-1562941). P.J. also thanks the Universidad de Sevilla for financial support (Grant PIF II.2A, through VI Plan Propio de Investigación). This work made use of the MatCI Facility at Northwestern University, which receives support from the MRSEC Program (NSF DMR-1720139). Tomography experiments were performed at the DuPont-Northwestern-Dow Collaborative Access Team (DND-CAT), Sector 5 of the Advanced Photon Source, operated by Argonne National Laboratory (DOE DE-AC02-06CH11357). The authors gratefully acknowledge Dr. William Guise (DND-CAT) for assistance in collecting and processing the tomography data.

Keywords

Fe
foam
optical metallography

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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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 fixederature 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.",

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AU - Lloreda-Jurado, P. J.

AU - Wilke, S. K.

AU - Scotti, K.

AU - Paúl-Escolano, A.

AU - Dunand, D. C.

AU - Sepúlveda, R.

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N2 - 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 fixederature 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.

AB - 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 fixederature 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.

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

Abstract

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Keywords

ASJC Scopus subject areas

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