EFFECT OF PREPARATION CONDITIONS ON PROPE RTIES OF GREEN AND SINTEREDBODY IN ALUMINA

The effect of preparation conditions of alumina ceramics to the proper ties of green and sintered bodies was investigated. In this experiment , both ball milling and attrition milling techniques were applied to p repare the suspensions, and the effects of the content of an organic b inder, the temperature of spray drying, and the pressure of uniaxial m old pressing and CIPing were studied to the properties of green and si ntered samples. Results indicated that the density and the pore size d istribution of the green compact depended upon the content of a binder , showing the densities of compacts before dewaxing were higher in the case of more amount of an added binder probably due to the effects of improved plasticity and lubricity of granules. After dewaxing, howeve r, the addition of lower amount of a binder contributed to the increas e of green densities with the formation of small pores in the matrix. Decrease of an added binder was also effective to obtain the increased density and the improved bending strength after sintering.