Abstract
The DCC (direct-coagulation casting) method allows controlling the interparticle forces in a suspension via an internal chemical reaction. It can be used for producing ceramic components with complicated shapes, homogeneous microstructures, high strength, and reliability. This ceramic-forming technique might also find applications in microfabrication of very small ceramic components and structures used for sensors and actuators. This chapter describes the basics of DCC and the reactions involved in coagulation. Polymer binders are used in ceramic forming to increase the strength of the green bodies. This effect can be exploited in DCC for increasing the wet green-body strength as well. The chapter illustrates the different microstructures resulting from different coagulation kinetics: on one hand, a delayed coagulation because of an energy barrier in the interaction potential leads to a particle rearrangement; on the other hand, a rapid switch from a repulsive to a purely attractive interaction potential preserves the random order of the particles.
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