Abstract
Porous ceramics with tailored pore size and shape are promising materials for the realization of a number of functional and structural properties. A novel method has been reported for the investigation of the role of SiC in the formation of SiO₂ foams by colloidal wet processing. Within a suitable pH range of 9.9 ~ 10.5 SiO₂, particles were partially hydrophobized using hexylamine as an amphiphile. Different mole ratios of the SiC solution were added to the surface modified SiO₂ suspension. The contact angle was found to be around 73°, with an adsorption free energy 6.8 × 10 −12 J. The Laplace pressure of about 1.25 ~ 1.6 mPa was found to correspond to a wet foam stability of about 80 ~ 85%. The mechanical and thermal properties were analyzed for the sintered ceramics, with the highest compressive load observed at the mole ratio of 1:1.75. Hertzian indentations are used to evaluate the damage behavior under constrained loading conditions of SiO₂–SiC porous ceramics.
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