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Slip Casting (Water Content around 30%-35%) (FORM OF CASTING…
Slip Casting
(Water Content around 30%-35%)
ADVANTAGE
-form complex shape products
-form big products
-high reproductibility rate
-any ceramic suspension possible
FORM OF CASTING
Battery/Solid Casting
Joining mold to produce multiple product
Pressure Casting
-Involve slight external pressure
-Use P.O.P mold or polymeric mold
Bench Casting
One mold is use to produce one prodcut
DISADVANTAGE
-Long Processing Time
-Require dry cast & working mold
-Large working area
-Preferential alignment when using clay
SLIP REQUIREMENT
Suitable Slip Viscosity&Thixotropy
-Ease of slip into mold&follow shape of mold
Stable Slip& particles always in suspension
-No chemical reaction
High Solid Content Slip
Less water absorbed into mold, longer mold life
Controlled by
Raw Materials
Control the slip density
Deflocculant
Attraction and repulsion force exist between clay particle, forming "spider-web",reducing viscosity
Common Deflocculant
Sodium Silicate
Sodium Carbonate
3.Calgon
Water
Although viscosity drop, surface charge doesn't change, can form "spider-web" structure.
TYPE OF CASTING
Drain Casting
1.Slip pour into mold and form cast layer in inner side of mold
2.Excess slip will be drain out
3.Partial Shrinkage enable release of cast of mold
4.Trimming of semi-wet green body is then glaze &firing
Solid Casting
-Forming cast later on both side of opposite walls
-Produced varying cast thickness