Replication Processing of Highly Porous Materials

Conde, Yves; Despois, Jean; Goodall, Russell; Marmottant, A.; Salvo, Luc; Marchi, Chris San; Mortensen, Alicja

doi:10.1002/adem.200600077

Cited by 122 publications

(89 citation statements)

References 58 publications

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“…ERG Duocel open-cell aluminum foams are fabricated following a process similar to investment casting, which replicates the porous preform of a polymer precursor. [11][12][13] Foam specimens are machined from the as-received large foam blocks supplied by ERG. In an effort to avoid possible effects of plastic deformation due to diamond sawing, cylindrical samples of 10 and 20 mm in diameter were obtained via electrodischarge machining.…”

Section: A Studied Open-cell Aluminum Foamsmentioning

confidence: 99%

Periodic unit cell reconstruction of porous media: Application to open-cell aluminum foams

Perrot

Panneton

Olny

2007

Journal of Applied Physics

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In this article, the issue of reconstructing an idealized periodic unit cell ͑PUC͒ to represent a porous medium is examined by means of microcomputed tomography ͑ CT͒. Using CT, three-dimensional images of open-cell foam are collected and used to characterize the representative parameters of its cellular morphology. These parameters are used in order to reconstruct the porous medium by means of an idealized PUC: a tetrakaidecahedron with ligaments of triangular cross sections, whose characteristic dimensions have been measured on the CT images. The proposed reconstruction of the idealized PUC is applied to four aluminum foams. The averaged macroscopic properties of the foams ͑open porosity and thermal characteristic length͒ are deduced from their respective PUC model and compared to experimental measurements and literature data. Good correlations are obtained. For each of the foams, this provides a parameterized idealized periodic unit cell on which the partial differential equations governing sound dissipation and propagation in foams can be solved with a view to studying the microphysical basis of the acoustical macrobehavior.

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Section: A Studied Open-cell Aluminum Foamsmentioning

confidence: 99%

Periodic unit cell reconstruction of porous media: Application to open-cell aluminum foams

Perrot

Panneton

Olny

2007

Journal of Applied Physics

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“…[1,25,[30][31][32]. In brief, sieved monodisperse sodium chloride powder (99.5 % purity NaCl from Fluka Chemie GmbH, Buchs, Switzerland) with particles 400 µm in average diameter was packed and cold isostatically pressed under pressures in the range 30-45 MPa.…”

Section: Methodsmentioning

confidence: 99%

“…Replicated microcellular aluminium is made by producing a porous preform of bonded NaCl powder for subsequent infiltration with aluminium or one of its alloys [1,2]. After metal solidification, the NaCl preform is removed by dissolution in water to create a fine interconnected network of metal.…”

Section: Introductionmentioning

confidence: 99%

Influence of microstructural heterogeneity on the scaling between flow stress and relative density in microcellular Al–4.5 %Cu

2014

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We explore the influence of the metal microstructure on the compressive flow stress of replicated microcellular 400 µm pore size Al-4.5wt%Cu solidified at two different solidification cooling rates, in as-cast and T6 conditions. It is found that the yield strength roughly doubles with age-hardening but does not depend on the solidification cooling rate.Internal damage accumulation, measured by monitoring the rate of stiffness loss with strain, is similar across the four microstructures explored and equals that measured in similar microcellular pure aluminium. In-situ flow curves of the metal within the open-pore microcellular material are back-calculated using the Variational Estimate of Ponte Castañeda and Suquet. Consistent results are obtained with heat-treated microcellular Al-4.5wt%Cu, and are also obtained with separate data for pure Al; however, for as-cast microcellular Al-4.5wt%Cu the back-calculated in-situ metal flow stress decreases, for both solidification rates, with decreasing relative density of the foam. We attribute this effect to an interplay between microstructural and mesostructural features of the microcellular material: variations in the latter with the former held constant can alter the scaling between flow stress and relative density within microcellular alloys.

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“…For the production of foams with materials that are processed at temperature around 650-750 °C, sodium chloride is a well suited space holder. It is inexpensive, chemically inert in contact with molten aluminium and many other materials, leaches easily since it is highly soluble in water, and creates essentially no environmental or healt hazards (Conde et al, 2006). In some cases, leachable patterns can also be machined to complex geometries prior to leaching and without damaging the architecture of the sponge.…”

Section: Processes Comparisonmentioning

confidence: 99%

Investigation and Comparison of Aluminium Foams Manufactured by Different Techniques

Surace¹,

Filippis²

2010

Advanced Knowledge Application in Practice

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Replication Processing of Highly Porous Materials

Cited by 122 publications

References 58 publications

Periodic unit cell reconstruction of porous media: Application to open-cell aluminum foams

Periodic unit cell reconstruction of porous media: Application to open-cell aluminum foams

Influence of microstructural heterogeneity on the scaling between flow stress and relative density in microcellular Al–4.5 %Cu

Investigation and Comparison of Aluminium Foams Manufactured by Different Techniques

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