Article Dans Une Revue Journal of the European Ceramic Society Année : 2012

Dispersion behaviour of laser-synthesized silicon carbide nanopowders in ethanol for electrophoretic infiltration

Résumé

SiC nanopowders of 30 nm in diameter were successfully synthesized by laser-pyrolysis with high production rate (1.7 kg/h) and high quantity (>2 kg). The as-synthesized nanopowders were heat-treated in order to slightly oxidize the surface. It was shown that the heat-treatment does not modify structural properties or morphology but modifies the surface chemistry. Ethanolic suspensions with polyethylenimine (PEI) as dispersant were prepared from the heat-treated powders. The suspensions properties were characterized in terms of rheology, zeta potential and size distribution before and after operational pH adjustment with hydrochloric acid (HCl 1 M) or acetic acid (CH 3 COOH). High concentrated suspensions (28 wt%) with low viscosity were obtained after pH adjustment with CH 3 COOH. Electrophoretic infiltrations of carbon preforms carried out with these suspensions lead to a high quality infiltration of the inter-tows area as well as of the intra-tows area, some tows being completely filled with the nanopowders

Dates et versions

hal-05470140 , version 1 (21-01-2026)

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Citer

A. Coupé, H. Maskrot, E. Buet, A. Renault, P.J. Fontaine, et al.. Dispersion behaviour of laser-synthesized silicon carbide nanopowders in ethanol for electrophoretic infiltration. Journal of the European Ceramic Society, 2012, 32 (14), pp.3837-3850. ⟨10.1016/j.jeurceramsoc.2012.05.022⟩. ⟨hal-05470140⟩
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