Hydrolysis assisted solidification of silicon carbide ceramics from aqueous suspension

The hydrolysis assisted solidification (HAS) process was used in the slurry forming of SiC green bodies. AlN powder was added to aqueous SiC slurry prior to shaping. The addition of small amount of AlN powder causes a dramatic increase in the suspension viscosity or even solidification in the case of highly loaded suspension. Green bodies were successfully produced. Measurements of the changes in viscosity, the pH and the zeta potential measurements were performed to evaluate the process. Effects of the addition of AlN and solidification temperature on the process and the ceramic suspension were followed.