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Integrative Chemistry toward Biosourced SiC Macrocellular Foams Bearing Unprecented Heat Transport Properties

Published online by Cambridge University Press:  07 January 2014

Simona Ungureanu
Affiliation:
Centre de Recherche Paul Pascal, UPR 8641-CNRS, Université de Bordeaux, 115 Avenue Albert Schweitzer, 33600 Pessac, France Université de Bordeaux, Institut des Sciences Moléculaires (ISM) UMR 5255 CNRS, 351 Cours de la Libération, 33405 Talence, France
Marc Birot
Affiliation:
Université de Bordeaux, Institut des Sciences Moléculaires (ISM) UMR 5255 CNRS, 351 Cours de la Libération, 33405 Talence, France
Gérard Vignoles
Affiliation:
Université de Bordeaux, Laboratoire des Composites Thermostructuraux, UMR 5801 CNRS-UB1-CEA-Snecma Propulsion Solide, 3 Allée de la Boétie, 33600 Pessac, France
Christophe Lorette
Affiliation:
CEA, Laboratoire des Composites Thermostructuraux, UMR 5801 CNRS-UB1-CEA-Snecma Propulsion Solide, 3 Allée de la Boétie, 33600 Pessac, France
Gilles Sigaud
Affiliation:
Centre de Recherche Paul Pascal, UPR 8641-CNRS, Université de Bordeaux, 115 Avenue Albert Schweitzer, 33600 Pessac, France
Hervé Deleuze
Affiliation:
Université de Bordeaux, Institut des Sciences Moléculaires (ISM) UMR 5255 CNRS, 351 Cours de la Libération, 33405 Talence, France
Rénal Backov
Affiliation:
Centre de Recherche Paul Pascal, UPR 8641-CNRS, Université de Bordeaux, 115 Avenue Albert Schweitzer, 33600 Pessac, France
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Abstract

Black liquor is a by-product of the paper mill Kraft process that deserves more valorization than its present use as low-grade fuel. In this work, SiC/C composite foams were prepared for the first time from concentrated emulsions by carbothermal reduction of bio-sourced precursors combining sodium silicate by lignin at 1400°C. The composition of the materials was determined by XRD, FTIR and Raman analyses. Their porous structure was characterized by SEM, mercury intrusion porosimetry, and nitrogen sorption, while their thermal properties were measured by TGA and dynamic DSC. Concerning their heat transport properties, we found out that when the starting lignin content was increased, the final C/Si ratio, the specific surface area and the heat diffusivity increased as well. Its high values were attributed to a cooperative effect between radiative heat transfer and the presence of partially graphitized carbon.

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Articles
Copyright
Copyright © Materials Research Society 2014 

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