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SLIP CASTING (STAGE OF SLIP CASITNG (Pouring of slurry of ceramic body…
SLIP CASTING
STAGE OF SLIP CASITNG
- Pouring of slurry of ceramic body composiiton
- extraction of water into moulds
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FORM OF CASTING
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advantages : high quality, less skin defect of cast, change mould easy, longer mould life, deform shape reduced
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METHOD
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- criteria and method determination
- deflocculant and the effect
ADVANTAGES
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- high reproducibility rate with smooth surface& fine details
- used for complex shaped products
DISADVANTAGES
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- need to dry cast & moulds
- require large working area
RHEOLOGY
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(ii) viscosity
- electrolyte (deflocculant) will reduce he viscosity
- common deflocculant ; Na silicate, Na hexametaphosphate(calgon), Na carbonate, dispex, CMC.
- Deflocculant slip ; (i)icast body will dense & solid, (ii) physical & mechanical properties will be better
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IMPORTANT & CRITERION
- Require high solid content with controlled amount of water (suitable viscosity)
- good properties (eg; dense. good green strenght )
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CAST RATE
- balance between mould absorption with permeability of cast layer & mould permeability