The Effect of Boehmite on Wet Green Strength for Direct Coagulation Casting of Alumina

In order to improve wet strength of DCC-green bodies boehmite sols were added into α－Al_2O_3 suspensions. In the present paper, the properties of wet green bodies, drying behavioursand densification process of Al_2O_3+AlOOH system were studied. The results indicated that wetcompressive strength and modulus could be largely increased with a small amount of boehmiteaddition. As the solid loading of boehmite is less than 3 vol% there is no influence for dryingprocess. The α－Al_2O_3 ceramics with very high sintered densities of 3.97 g/cm~3(99.7% TD) andhomogeneous microstructure could be achieved after sintering.