A sharp reduction in the ultimate shear stress in the range of 20 – 80°C is observed during preparation of specimens of a clay component without thinners that facilitates development of cracks and defects. Use of pyrophyllite in ceramic mixes during specimen preparation provides a gradual reduction in the ultimate shear stress P_m in the range of 20 – 80°C. It is shown that in order to improve specimen drying properties a pyrophyllite – clay – water composition is more homogeneous than a clay – water composition Analysis of specimen P_m under hot forming conditions shows that the relationship Pm = f(t) is not as important as the relationship P_m = f(W,t), where t is temperature, and W is humidity.

中文翻译：

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高温下叶蜡石-黏土成分-水组成的极限剪切应力研究

在没有稀释剂的情况下制备粘土组分的样品时，观察到极限剪切应力急剧降低，范围为20 – 80°C，这有利于裂纹和缺陷的发展。在样品制备过程中在陶瓷混合物中使用叶蜡石可在20 – 80°C的范围内逐渐减小极限剪切应力P _m。结果表明，为了改善样品的干燥性能，叶蜡石-粘土-水的成分要比粘土-水的成分更为均匀。在热成型条件下对样品P _m的分析表明，关系Pm = f（t）并不那么重要作为关系P _m= f（W，t），其中t是温度，W是湿度。