MAZERAT, Stéphane; LACROIX, Joséphine; RUFINO, Benoît; PAILLER, Rene

doi:10.1016/j.mtcomm.2019.01.013

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MAZERAT, Stéphane
Laboratoire des Composites Thermostructuraux [LCTS]

LACROIX, Joséphine
Laboratoire des Composites Thermostructuraux [LCTS]

RUFINO, Benoît
Laboratoire des Composites Thermostructuraux [LCTS]

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Materials Today Communications. 2019, vol. 19, p. 177-185

Résumé en anglais

SiC-based fibers, eleven in total, derived from polycarbosilane pyrolysis and belonging to the three different generations, were fully converted into microporous carbon after selective etching of silicon atoms under pure chlorine flow at intermediate temperatures (550–850 °C). In this work, relationship between as-received fibers and their subsequent carbide-derived carbon (CDC) properties, pore structure oxidation resistance and mechanical properties, was investigated. The resulting carbon is microporous or micro-mesoporous with equivalent specific surface area exceeding 1000 m2 g−1 and pore size distribution (PSD) related to the substrate chemical composition and microstructure of former fibers. Oxidation kinetics were found to depend on this PSD. The former sp2 carbon free network of fibers remained unaffected by the chlorination. Its amount and percolation were respectively correlated to Young modulus and tensile strength of CDC. This carbon thus displays a nano-composite-like behavior with a former etched carbide matrix (transformed SiC and SiCO) and carbon free reinforcement. The results demonstrate CDC allows the control over pore size and mechanical properties by selecting an appropriate multiphasic substrate, combining etched and non-etched compounds.< Réduire

Mots clés en anglais

Silicon carbide

CDC

Chlorination

Pore size

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Carbon derived from silicon carbide fibers, a comparative study

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