Porosity Effect on Thermal Properties of Al-12 wt % Si/Graphite Composites
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Title: | Porosity Effect on Thermal Properties of Al-12 wt % Si/Graphite Composites |
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Authors: | Molina Jordá, José Miguel | Rodríguez Guerrero, Alejandro | Louis, Enrique | Rodríguez Reinoso, Francisco | Narciso, Javier |
Research Group/s: | Materiales Avanzados | Física de la Materia Condensada |
Center, Department or Service: | Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Departamento de Física Aplicada | Universidad de Alicante. Instituto Universitario de Materiales |
Keywords: | Graphite particles | Porosity | Gas pressure infiltration | Thermal conductivity | Coefficient of thermal expansion |
Knowledge Area: | Química Inorgánica | Física de la Materia Condensada |
Issue Date: | 14-Feb-2017 |
Publisher: | MDPI |
Citation: | Molina J-M, Rodríguez-Guerrero A, Louis E, Rodríguez-Reinoso F, Narciso J. Porosity Effect on Thermal Properties of Al-12 wt % Si/Graphite Composites. Materials. 2017; 10(2):177. doi:10.3390/ma10020177 |
Abstract: | The effect of porosity on the thermal conductivity and the coefficient of thermal expansion of composites obtained by infiltration of Al-12 wt % Si alloy into graphite particulate preforms has been determined. Highly irregular graphite particles were used to fabricate the preforms. The thermal conductivity of these composites gradually increases with the applied infiltration pressure given the inherent reduction in porosity. A simple application of the Hasselman-Johnson model in a two-step procedure (that accounts for the presence of both graphite particles and voids randomly dispersed in a metallic matrix) offers a good estimation of the experimental results. As concerns the coefficient of thermal expansion, the results show a slight increase with saturation being approximately in the range 14.6–15.2 × 10−6 K−1 for a saturation varying from 86% up to 100%. Results lie within the standard Hashin-Strikman bounds. |
Sponsor: | The authors acknowledge partial financial support from “Ministerio de Ciencia e Innovación” (grant MAT2016-77742-C2-2-P) and the “Generalitat Valenciana” (PROMETEO II/2014/004-FEDER). |
URI: | http://hdl.handle.net/10045/63348 |
ISSN: | 1996-1944 |
DOI: | 10.3390/ma10020177 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Rights: | © 2017 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
Peer Review: | si |
Publisher version: | http://dx.doi.org/10.3390/ma10020177 |
Appears in Collections: | INV - Física de la Materia Condensada - Artículos de Revistas INV - LMA - Artículos de Revistas |
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2017_Molina_etal_Materials.pdf | 2,08 MB | Adobe PDF | Open Preview | |
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