The production technique of porous compacts of ceramics containing fine pores have been developed. The mixtures of silica ultrafine particles (pre-treated with solvents) and liquid paraffin were pressed under 300kg/cm2 and then fired at 800°-920°C, and the characteristics of the compacts obtained were measured. Mixtures of ultrafine silica which was pretreated by colloidal solution of silica and liquid paraffin of large quantities gave porous compacts containing fine pores. Better results were obtained when 1-18% colloidal silica was added in pre-treatment and the firing temperature was about 850°C. Apparent porosity was 60-80% for the obtained compacts. The mean pore diameter was 0.04μm for the compacts fired at 800°C, which remained virtually with increasing firing temperature, but decreased with increasing content of colloidal silica. Specific surface area was 130m2/g for the compacts fired at 850°C, and decreased with an increase both in temperature and content of colloidal silica, respectively.
