ZrO₂–TiO₂ porous ceramics from particle stabilized wet foam by colloidal processing

抄録

ZrO₂–TiO₂ porous ceramics recently has been great interest in the dielectric resonator materials, as well as in the fields of preparation of optical devices, and bio materials. This study reveals an approach for the production of micro porous ceramics consisting of TiO₂ and ZrO₂ fabricated by colloidal wet processing. ZrO₂ particles in the colloidal suspension was partially hydrophobized using propyl gallate as an amphiphile, with a suitable pH range. The different mole ratios of the TiO₂ suspension was added to the surface modified ZrO₂ suspension. The contact angle was found to be around 75° with the adsorption free energy of 1.8 × 10⁻¹¹–2.15 × 10⁻¹¹ J. The Laplace pressure of about 1.48–1.24 mPa was determined corresponding to the wet foam stability of about 76–80%. The microstructure analysis is done after sintering the dried samples for obtaining the porous ceramics.