The results of investigations of the rheological properties of typical ceramic slurries used in the investment casting technology – the lost

wax technology are presented in the paper. Flow curves in the wide range of shear velocity were made. Moreover, viscosity of ceramic

slurries depending on shearing stresses was specified. Tests were performed under conditions of three different temperatures 25, 30 and

35oC, which are typical and important in the viewpoint of making ceramic slurries in the investment casting technology.

In the light of the performed investigations can be said that the belonging in group of Newtonian or Non – Newtonian fluid is dependent

on content of solid phase (addition of aluminum oxide) in the whole composition of liquid ceramic slurries.