The acoustic emission (AE) technique was employed to monitor crack formation in the water-saturated ceramic material subjected to freeze–thaw cycles. The samples with water accessible porosity ranging from 6 to 50 vol% were prepared from the illite-rich clay by the sacrificing template method. The experimental samples were fired to 1100 °C in the static air atmosphere. Afterward, they were saturated with distilled water and subjected to the freeze–thaw cycles in the temperature range from − 22 to 20 °C. The AE signals occurred repeatedly during freeze–thaw cycling and they were attributed to the formation of microcracks in the ceramic body. The intensity of microcracking increased with increasing porosity. The microcracks were created primarily during the freezing stages of the experiment. Nevertheless, a considerable number of microcracks also appeared during thawing, especially in the ceramic body with pores below 1 μm. The microcracking during thawing was attributed to the reabsorption of water by tiny pores.

中文翻译：

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水饱和多孔陶瓷在冻融循环过程中微裂纹的形成以及随后的声发射

声发射 (AE) 技术用于监测经受冻融循环的水饱和陶瓷材料中的裂纹形成。通过牺牲模板法从富含伊​​利石的粘土中制备了水可及孔隙率为 6% 至 50 vol% 的样品。实验样品在静态空气气氛中被烧制到 1100°C。然后，它们用蒸馏水饱和，并在 - 22 至 20 °C 的温度范围内进行冻融循环。AE 信号在冻融循环过程中反复出现，它们归因于陶瓷体中微裂纹的形成。微裂纹的强度随着孔隙度的增加而增加。微裂纹主要是在实验的冷冻阶段产生的。尽管如此，解冻过程中也出现了相当多的微裂纹，尤其是孔隙小于1 μm的陶瓷体。解冻过程中的微裂纹归因于微小孔隙对水的重吸收。