Tough silicon carbide macro/mesocellular crack-free monolithic foams
SOUM, Alain
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
< Réduire
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
Langue
en
Article de revue
Ce document a été publié dans
Journal of Materials Chemistry. 2011, vol. 21, n° 38, p. 14732-14740
Royal Society of Chemistry
Résumé en anglais
Taking the benefit of Si(HIPE) as a hard monolithic template to shape macro-mesoporous foams by using polycarbosilane as pre-ceramic precursor beta-SiC, macro/mesocellular foams have been synthesized. Both macroscopic ...Lire la suite >
Taking the benefit of Si(HIPE) as a hard monolithic template to shape macro-mesoporous foams by using polycarbosilane as pre-ceramic precursor beta-SiC, macro/mesocellular foams have been synthesized. Both macroscopic Plateau border morphology and final mechanical properties can be tuned through varying the starting amount of polycarbosilane precursor. Resulting silicon carbide foams, labeled SiC(HIPE), are composed of beta-SiC at the microscopic length scale, while bearing 110 m(2) g(-1) as specific area at the mesoscopic length scale, and up to 92% of macroporosity. The as-synthesized crack-free SiC(HIPE) monolithic foams are associated with outstanding mechanical properties as, for instance, 50-58 MPa of compression Young modulus. The thermal behaviors of these foams are assessed with bulk heat capacities comprising between 0.15 J g(-1) K(-1) to 0.55 J g(-1) K(-1) that decrease when the foam porosity increases, while their heat conductivities are following the same rules ranging from 2.6 to 4.6 W m(-1) K(-1).< Réduire
Mots clés en anglais
HIGH-SURFACE-AREA
INTEGRATIVE-CHEMISTRY
NONOXIDE CERAMICS
CARBON
EMULSION
PARTICLES
POROSITY
Origine
Importé de halUnités de recherche