Slip casting products
fall in the category of crystalline ceramics. In general,
the processing of ceramic materials fall into two classes based
on the properties of the material, i.e., glasses or crystalline
Glasses are manufactured
into useful articles by first producing a viscous liquid, then shaping
the material under viscous flow conditions, and finally cooling
the material to produce a solid product.
have a characteristic brittle behavior and are normally manufactured
into useful components by first preparing a shape by pressing moist
aggregates or powder, followed by drying, and then bonding by one
of a variety of mechanisms: chemical reaction, verification, or
The mold used in slip
casting contains very fine pores. The liquid is removed from the
slurry by capillary action. This allows the ceramic particles to
deposit on the walls of the mold forming a "green" body.
The green part is dried
in a controlled process to minimize the stresses, distortion, and
cracking. Then it is subject to a firing operation to fuse the particles
together and produce the desired level of strength. Control of temperature
and time can control the diffusion process and produce products
with controlled grain size, pore size, and pore shape.