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Origin and Evolution of Cracks in the Glaze Surface of a Ceramic during the Cooling Process
Because of the significant difference between the thermal expansion coefficients of ceramic blank and glaze, the glaze typically undergoes more pronounced shrinkage than the blank during ceramic cooling, which results in high stress concentrations and cracking. In this study, the mechanical mechanis...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10456388/ https://www.ncbi.nlm.nih.gov/pubmed/37629798 http://dx.doi.org/10.3390/ma16165508 |
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author | Chen, Tiantian Gong, Bin Tang, Chun’an |
author_facet | Chen, Tiantian Gong, Bin Tang, Chun’an |
author_sort | Chen, Tiantian |
collection | PubMed |
description | Because of the significant difference between the thermal expansion coefficients of ceramic blank and glaze, the glaze typically undergoes more pronounced shrinkage than the blank during ceramic cooling, which results in high stress concentrations and cracking. In this study, the mechanical mechanism of glaze cracking is studied, based on the statistical strength theory, damage mechanics, and continuum mechanics. Furthermore, the influence of the glaze layer thickness, heat transfer coefficient, expansion coefficient, and temperature difference on the creation and propagation of inner microcracks is systematically investigated, and the final discrete fracture network of ceramics is discussed at the specific crack saturation state. The results show that (1) a higher heat transfer coefficient will lead to a more uniform distribution of the surface temperature and a faster cooling process of the ceramics, reducing the number of microcracks when the ambient temperature is reached; (2) the thinner glaze layer is less prone to cracking when its thickness is smaller than that of the blank. However, when the thickness of the glaze layer is similar to that of the blank, the increased thickness of the glaze layer will increase the number of cracks on its surface; and (3) when the expansion coefficient of the glaze layer is smaller than that of the blank, cracks will not occur inside the glaze layer. However, as the coefficient of the thermal expansion of the glaze layer continuously rises, the number of cracks on its surface will first increase and then decrease. |
format | Online Article Text |
id | pubmed-10456388 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-104563882023-08-26 Origin and Evolution of Cracks in the Glaze Surface of a Ceramic during the Cooling Process Chen, Tiantian Gong, Bin Tang, Chun’an Materials (Basel) Article Because of the significant difference between the thermal expansion coefficients of ceramic blank and glaze, the glaze typically undergoes more pronounced shrinkage than the blank during ceramic cooling, which results in high stress concentrations and cracking. In this study, the mechanical mechanism of glaze cracking is studied, based on the statistical strength theory, damage mechanics, and continuum mechanics. Furthermore, the influence of the glaze layer thickness, heat transfer coefficient, expansion coefficient, and temperature difference on the creation and propagation of inner microcracks is systematically investigated, and the final discrete fracture network of ceramics is discussed at the specific crack saturation state. The results show that (1) a higher heat transfer coefficient will lead to a more uniform distribution of the surface temperature and a faster cooling process of the ceramics, reducing the number of microcracks when the ambient temperature is reached; (2) the thinner glaze layer is less prone to cracking when its thickness is smaller than that of the blank. However, when the thickness of the glaze layer is similar to that of the blank, the increased thickness of the glaze layer will increase the number of cracks on its surface; and (3) when the expansion coefficient of the glaze layer is smaller than that of the blank, cracks will not occur inside the glaze layer. However, as the coefficient of the thermal expansion of the glaze layer continuously rises, the number of cracks on its surface will first increase and then decrease. MDPI 2023-08-08 /pmc/articles/PMC10456388/ /pubmed/37629798 http://dx.doi.org/10.3390/ma16165508 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Chen, Tiantian Gong, Bin Tang, Chun’an Origin and Evolution of Cracks in the Glaze Surface of a Ceramic during the Cooling Process |
title | Origin and Evolution of Cracks in the Glaze Surface of a Ceramic during the Cooling Process |
title_full | Origin and Evolution of Cracks in the Glaze Surface of a Ceramic during the Cooling Process |
title_fullStr | Origin and Evolution of Cracks in the Glaze Surface of a Ceramic during the Cooling Process |
title_full_unstemmed | Origin and Evolution of Cracks in the Glaze Surface of a Ceramic during the Cooling Process |
title_short | Origin and Evolution of Cracks in the Glaze Surface of a Ceramic during the Cooling Process |
title_sort | origin and evolution of cracks in the glaze surface of a ceramic during the cooling process |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10456388/ https://www.ncbi.nlm.nih.gov/pubmed/37629798 http://dx.doi.org/10.3390/ma16165508 |
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