Tough silicon carbide macro/mesocellular crack-free monolithic foams
SOUM, Alain
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
< Leer menos
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
Idioma
en
Article de revue
Este ítem está publicado en
Journal of Materials Chemistry. 2011, vol. 21, n° 38, p. 14732-14740
Royal Society of Chemistry
Resumen en inglés
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 ...Leer más >
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).< Leer menos
Palabras clave en inglés
HIGH-SURFACE-AREA
INTEGRATIVE-CHEMISTRY
NONOXIDE CERAMICS
CARBON
EMULSION
PARTICLES
POROSITY
Orígen
Importado de HalCentros de investigación