Ceramics-Silikáty 37, (2) 79 - 82 (1993)

A comparison of microscopically evaluated orientation of particles with calculated forming rate profiles provided evidence for the effect of the forming rate field on the orientation of particles during mix flow through the orifice of the forming machine. The region of disarranged orientation of particles is narrowed down with increasing forming rate, and its radius is in good agreement with the radius corresponding to the end of piston flow. The calculated mathematical model of the mix flow allows the forming conditions to be controlled, and thus various degrees of particle orientation to be achieved. The model approach is convenient for preparing materials according to their respective way of use and stressing, because various combinations of particle orientation determine the directional strength of ceramics.