EL MANSOURI, Amine; GUETTE, Alain; BERTRAND, Nathalie; VIGNOLES, Gerard

doi:10.1016/j.cej.2023.143544

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EL MANSOURI, Amine

Laboratoire des Composites Thermostructuraux [LCTS]

GUETTE, Alain
Laboratoire des Composites Thermostructuraux [LCTS]

BERTRAND, Nathalie

Laboratoire des Composites Thermostructuraux [LCTS]

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Chemical Engineering Journal. 2023-07-15, vol. 468, p. 143544

Résumé en anglais

SiC powders coated by pyrocarbon are a promising feedstock for the synthesis of Ceramic-matrix composites. Preparing such powders is possible using low pressure Fluidized-Bed Chemical Vapor Deposition (FB-CVD) with propane as a precursor at 1000 °C. A preliminary study on non-porous and porous alumina powders as substrates has been carried out. With the help of a numerical assessment of heat transfer in the reactor, it has been possible to optimize the setup and achieve excellent deposition yields (up to 100%), even inside very small pores (7 nm), and transpose the protocol to 200-nm diameter SiC powders. The microstructure and texture of the deposits were characterized by TEM, showing dependence to pore size due to a texture-induction effect by the substrate surface. A quantitative assessment of mass transfer indicated that the results obtained here agree with past studies on FB-CVD of other materials and on pyrocarbon CVD on flat substrates.< Réduire

Mots clés en anglais

Fluidized Bed

Chemical Vapor deposition

pyrocarbon

heat and mass transfer

microstructure

reaction kinetics

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Fluidized Bed Chemical Vapor Deposition of pyrocarbon on various types of powders: heat and mass transfer analyses and nanotexture characterization

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