Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Particle Stabilized Wet Foam to Prepare SiO2-SiC Porous Ceramics by Colloidal Processing

  • Bhaskar, Subhasree (Institute of Processing and Application of Inorganic Materials (PAIM), Department of Materials Science and Engineering, Hanseo University) ;
  • Park, Jung Gyu (Institute of Processing and Application of Inorganic Materials (PAIM), Department of Materials Science and Engineering, Hanseo University) ;
  • Han, In Sub (Energy Materials Laboratory, Korea Institute of Energy Research (KIER)) ;
  • Lee, Mi Jai (Ceramics for Display & Optics, Korea Institute of Ceramic Engineering and Technology (KICET)) ;
  • Lim, Tae Young (Ceramics for Display & Optics, Korea Institute of Ceramic Engineering and Technology (KICET)) ;
  • Kim, Ik Jin (Institute of Processing and Application of Inorganic Materials (PAIM), Department of Materials Science and Engineering, Hanseo University)
  • Received : 2015.09.04
  • Accepted : 2015.10.15
  • Published : 2015.11.30
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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 $SiO_2$ foams by colloidal wet processing. Within a suitable pH range of 9.9 ~ 10.5 $SiO_2$, particles were partially hydrophobized using hexylamine as an amphiphile. Different mole ratios of the SiC solution were added to the surface modified $SiO_2$ suspension. The contact angle was found to be around $73^{\circ}$, with an adsorption free energy $6.8{\times}10^{-12}J$. 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 $SiO_2$-SiC porous ceramics.

Keywords

References

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