Abstract
In porcelain during cooling the smaller thermal expansion coefficient of the glassy phase compared with the quartz particles causes radial tensile stresses and may create microcracks between these two components. The initiation and growth of microcracks due to thermal stresses has been studied by applying the acoustic emission technique. Different sources of microcracks are detected depending on thermal history. The acoustic emission spectrum is approximately a superposition of two maxima near the phase transition of quartz and cristobalite. Microcracking depends on particle size. With decreasing size of the quartz particles the maximum of microcrack activity shifts to lower temperatures.
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Kirchhoff, G., Pompe, W. & Bahr, H.A. Structure dependence of thermally induced microcracking in porcelain studied by acoustic emission. J Mater Sci 17, 2809–2816 (1982). https://doi.org/10.1007/BF00644655
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DOI: https://doi.org/10.1007/BF00644655