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Materials 2017, 10(2), 177; doi:10.3390/ma10020177

Porosity Effect on Thermal Properties of Al-12 wt % Si/Graphite Composites

1
Instituto Universitario de Materiales, Universidad de Alicante, Apdo 99, Alicante E-03080, Spain
2
Departamento de Química Inorgánica, Universidad de Alicante, Apdo 99, Alicante E-03080, Spain
3
Departamento de Física Aplicada, Universidad de Alicante, Apdo 99, Alicante E-03080, Spain
4
Unidad Asociada del Consejo Superior de Investigaciones Científicas, Universidad de Alicante, Apdo 99, Alicante E-03080, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Dirk Lehmhus
Received: 23 December 2016 / Revised: 24 January 2017 / Accepted: 8 February 2017 / Published: 14 February 2017
(This article belongs to the Section Advanced Composites)
View Full-Text   |   Download PDF [2083 KB, uploaded 14 February 2017]   |  

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. View Full-Text
Keywords: graphite particles; porosity; gas pressure infiltration; thermal conductivity; coefficient of thermal expansion graphite particles; porosity; gas pressure infiltration; thermal conductivity; coefficient of thermal expansion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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, 177.

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