Numerous papers have presented data showing the relationship of slurry refractory particle size and mold properties. Other work has shown that increasing the width of the particle size distribution by combining sands, course and fine flours can improve slurry rheology, reduce dewax cracking and increase build rate. To date no studies have been published relating the characteristics of the slurry particle size distribution to mold properties.

This paper will demonstrate the ability to predict mold properties from the slurry particle size distribution. It will also show the influence these properties have on casting defects.

Various particle size blending techniques will be demonstrated to re-target mold properties and reduce variation.