Formulation of Moulding Compositions

In this respect it should have a sufficiently high viscosity at the mixing temperature for the imposition of shear stress on particle clusters under the influence of machine-imposed shear rates. Conditions of polymer-ceramic wetting may be desirable for stability of the dispersion but the long time required for establishment of the equilibrium contact angle of a high 

Confer fluidity on the powder sufficient for complete filling of the 

Confer adequate strength to the body during ejection fron the mould, 

Distortion during ejection m2iy be caused by low yield stress in the solidified body and is avoided by employing semicrystalline polymers or waxes or species with a glass transition temperature above ambient. 

It is important for high performance ceramic applications that the ash content of the polymer blend should be low in silicates and alkali metals. For moulding of non-carbide ceramics it is desirable to have a low residual carbon content. 

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