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The choice of method is determined by the geometry, the complexity of shape and the production volume of the component.

a.    Uniaxial pressing: In uniaxial pressing, the powder is poured into a rigid die and then pressed with a closely fitting punch. After pressing the punch is removed and the green compact is removed usually by ejection with a lower punch.

The shape and the size of the compact is limited by the frictio effects and that it has to be ejected from the die. Thus, the method is suitable for small components with relatively simple geometry.

b.    Cold Isostatic Pressing: In this process the powder is filled into a flexable mold generally prepared from rubber and then subjected to isostatic pressure via a fluid in a pressure chamber.

The rubber moulds rae relatively easy to produce but the process cycle itself is slow and so the method is appropriate for small series of components.

c.   Slip Casting: The principle of slip casting is that a slurry of the powder is poured into a porous mould, usually made of gypsum, which absorbs the liquid carrier causing the powder to be drawn to the mould walls.

This method is mostly used for production of traditional ceramics and is ideal for preparation of large, thin-walled, hollow components.

Injection moulding

d.    Injection molding: Injection molding involves mixing of the ceramic powder with a sufficient amount of polymer or other soft binder to produce a moldable dough. This is then injected under pressure into a mold.

With appropriate flow properties and strength, the mix can be molded to complex and intricate shapes.

 

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