Title:
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Structural and mechanical characterization of graphite foam/phase change material composites
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Author:
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Canseco, Vladimir; Anguy, Yannick; Roa Rovira, Joan Josep; Palomo, Elena
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. CIEFMA - Centre d'Integritat Estructural, Micromecànica i Fiabilitat dels Materials |
Abstract:
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We consider graphite/phase change material (PCM) composites for energy storage by latent
heat in the context of power generation by solar concentration technologies. Based on X-ray
computerized tomography 3D data, we calculate the cell-size distribution of polycrystalline
highly ordered mesophase pitch-based graphitic foams (KFoam ) and semi-crystalline coalbased
graphite foams (CFoam ). Compressive experiments show that the elastic modulus
and strength are higher in the z-direction (foaming direction) than in the xy-plane. The
elastic modulus Ez is found linearly related to the mean cell size d, while no simple relation
is found between Exy and d. This supports that mechanical properties of graphite foams do
not relate to the same geometrical characteristics depending whether the z-direction or the
xy-plane direction is considered. After infiltrating the KFoam and CFoam host porous
media with a molten PCM (sodium nitrate or a binary mixture of hydroxides), the response
of the composite materials to compression tests is shown to be dependent upon a complex
network of cracks all through the PCM, the occurrence of which is explained by the process
whereby the PCM crystallizes within the host graphite foam and by the contrast between the
thermo-mechanical properties of the PCM and those of the graphite. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria dels materials -Graphite composites -Grafit |
Rights:
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Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Document type:
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Article - Published version Article |
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