Preparation of Highly Porous Aluminosilicate Ceramics and Their Properties

Rice husks, abandoned as waste materials in large quantities every year，were utilized as pore former for porous ceramics. Particle size control of pulverized rice husks suppressed green body to collapse by burning at heating in air. Highly porous silicate ceramics in ternary system CaO-Al2O3SiO2 were prepared from a mixture of kaolin，calcite and pulverized rice husks by heat-treatment between 1000 and 1200℃. Buｌk density，porosity and water absorption properties were characterized by means of Archimedes' immersion method in boiling water and by water-absorption by capillary pressure