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ADDITIVES
needed to fix flow properties and other properties required in…
ADDITIVES
- needed to fix flow properties and other properties required in ceramic fabrication
LIQUID/SOLVENT
- needed to wet and provide the viscous media between the ceramic particle
- dissolve the salt or compounds
EXAMPLE
- water : low cost and easy to use
- non-aqueous (organic) liquid : trichloroethylene, alcohol, filtered petroleum, or melt wax
:!:ORGANIC FLUID IS DANGEROUS :!:
SURFACTANT
- used to decrease liquid surface tension or particle-liquid interface to raise the wetting and particle distribution
REQUIREMENT TO CHOOSE THE RIGHT SURFACTANT
- Iyophilic group
- Iyophobic group
SURFACTANT USED
- non ionic : Ethoxylated nonylphenol
- anion : Sodium stearate
- cation : Dodecyltrimethylammonium chloride
DEFLOCCULANT
- enhanced their repulsive via electric charge
- prevent the particle sticks to each others
EXAMPLE
- Inorganic : Sodium carbonate, Sodium silicate
- Organic : Sodium polyacrylate, Sodium citrate
COAGULANT (BINDER)
- electrolyte that encourage particle to agglomerate via reducing the repulsive
FLOCCULANT
- entrapped polymer molecule will form a bridge between them and *bond them to each other
- enchance the product strength
EXAMPLE
- organic : natural gums (Xanthan gum, gum arabic)
- inorganic : soluble silicates (Sodium silicate)
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