The study of the maximum shear stress of the composition of pyrophyllite - clay component – water at elevated temperatures
A sharp decrease in the ultimate shear stress in the range of 20‒80 °C is observed when obtaining samples from the clay component without descendents. This contributes to the appearance of cracks and defects in the samples. The use of pyrophyllite in ceramic masses in obtaining samples ensures a gradual decrease in the ultimate shear stress Pm in the range of 20‒80 °C. It is shown that to improve the drying properties of the samples, the composition of pyrophyllite ‒ clay ‒ water is more homogeneous than the composition of clay ‒ water. Analysis of the Pm of the samples under the conditions of hot forming showed that it is not so much the dependence Pm = f(t) that takes on special importance, but the dependence Pm = f(W, t), where t ― the temperature; W ― the humidity. Ill. 1. Ref. 8. Tab. 2.