Highly porous SiC ceramics from particle-stabilized suspension
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This study reports on the wet-foam stability of porous ceramics that are formed from a particle-stabilized colloidal suspension for which the direct-foaming method is used. To stabilize the wet foam, an initial colloidal suspension of silicon carbide (SiC) was partially hydrophobized by the surfactant octylamine (12.5 wt.%). The influence of the binder content on the wet-foam stability in terms of the air content, bubble size, contact angle, surface tension, surface-free energy, Laplace pressure, and relative bubble size is described in this paper. The results show a wet-foam stability of more than 95% that corresponds to an air content of 87.8%, an increase of the adsorption free energy from 3.0 × 10−5 to nearly 7.5 × 10−5 J, a Laplace pressure increase from 0.16 to 0.20 mPa, and a relative bubble size of 1.3 for the colloidal particles with a 20 wt% binder content. The uniform distribution of the highly open/interconnected pores could be controlled with thick struts and an increasing of the binder content up to 20 wt%, leading to the achievement of a higher-stability wet foam with respect to the porous ceramic.
KeywordsSiC Porous ceramics Direct foaming Wet-foam stability Colloidal suspension
This research was financially supported by Hanseo University, and it was conducted under the framework of the research and development program of the Korea Institute of Energy Research (B6-2455).
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