Abstract
Dried boehmite gel was preheated at various temperatures below 800°C and they were pressed and formed into bars. Then they were sintered in the temperature range of 1500-1650°C. The porosity and the bending strength of these sintered bodies were affected by the preheat-treatment temperature of the boehmite gel. There was no change in the structure of the sintered bodies which were preheated at temperatures below 200°C. A sintered body at 1650°C gave a porosity of 40% and a high bending strength of 80MPa. The relation, σ=ãρn was established between the bending strength (σ) and the density (ρ) of the sintered bodies. The exponent n in the above relation is the same and the factor ã is different between these two starting samples, boehmite and intermediate alumina. The factor ã is affected by the fractal structure of sintering body.
