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First Biosourced Monolithic Macroporous Si C / C Composite Foams ( B io‐ S i C / C ( HIPE )) Bearing Unprecedented Heat Transport Properties
Author(s) -
Ungureanu Simona,
Sigaud Gilles,
Vignoles Gérard L.,
Lorrette Christophe,
Birot Marc,
Deleuze Hervé,
Backov Rénal
Publication year - 2013
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201300015
Subject(s) - materials science , composite number , thermal diffusivity , carbothermic reaction , chemical engineering , lignin , sorption , sodium silicate , porosity , fourier transform infrared spectroscopy , raman spectroscopy , composite material , organic chemistry , adsorption , carbide , chemistry , physics , optics , quantum mechanics , engineering
For the first time SiC/C composite foams were prepared from concentrated emulsions by carbothermal reduction of biosourced 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 unprecedented high values were attributed to a cooperative effect between radiative heat transfer and the presence of partially graphitized carbon.