Porous Ceramics from Al2O3 Nanopowders

For sintering Al2O3 porous ceramic were used plasma-chemical synthesed powders with a specific surface area of 30 and 50 m2/g. Sintering were carried out in various conditions: sintering in nitrogen atmosphere, in air or vacuum at 1200-1700 °C. The most suitable sintering conditions are sintering in air at 1200-1500 °C using Al2O3 nanopowder with a specific surface area of 50 m2/g. Samples with open porosity of 35-45% and average pore size of 100-200 nm were obtained under these conditions.