8. Forming technologies

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von Niklas V.

Which forming methods are applied to granulated powder?

Pressing

Which froming technologies are appiied to ceramic paste?

extrusion, injection moulding

Which forming technologies are applied to ceramic suspension?

tape casting, slip casting

What are the DPS values for powder, paste and suspension?

powder: 0

paste: <1

slurry: >1

How does the direct grtanulation method work?

powder mixed with water in tumbler

How does the spray drying ranulation method work?

a suspension is induced into an air flow, which removes the moisture and produces granules

Does spray drying or direct granulation yield better results?

spray drying because of better size distribution

What are the additives in pressing?

binder, plasticizer, lubricant

What is the problem with unlubricated pressing?

different pressure distributions in the piece, which result in different springback and failure

What can be reasons for density gradients in pressing?

Which additives are used in Slip casting?

Deflocculant, (coagulant), (binder)

Which additives are used in Rape casting?

binder, plasticizer, deflocculant, wetting agent

Why are ceramic extrusion products hollow?

because of the high possibility of internal defects

What is the role of a major and minor binder in injection molding?

minor binder is easier removed and leaves space for the major binder to evaporate

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