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...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-08-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/16/16/5508 |
| _version_ | 1797584031009734656 |
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| author | Tiantian Chen Bin Gong Chun’an Tang |
| author_facet | Tiantian Chen Bin Gong Chun’an Tang |
| author_sort | Tiantian Chen |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-10T23:46:27Z |
| format | Article |
| id | doaj.art-5a71dbb3e03549679ae6539b018b395a |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T23:46:27Z |
| publishDate | 2023-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-5a71dbb3e03549679ae6539b018b395a2023-11-19T01:58:27ZengMDPI AGMaterials1996-19442023-08-011616550810.3390/ma16165508Origin and Evolution of Cracks in the Glaze Surface of a Ceramic during the Cooling ProcessTiantian Chen0Bin Gong1Chun’an Tang2School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, ChinaDepartment of Civil and Environmental Engineering, Brunel University London, London UB8 3PH, UKState Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, ChinaBecause 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.https://www.mdpi.com/1996-1944/16/16/5508ceramiccraquelureglaze crackingcrack propagationcooling |
| spellingShingle | Tiantian Chen Bin Gong Chun’an Tang Origin and Evolution of Cracks in the Glaze Surface of a Ceramic during the Cooling Process Materials ceramic craquelure glaze cracking crack propagation cooling |
| 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 | ceramic craquelure glaze cracking crack propagation cooling |
| url | https://www.mdpi.com/1996-1944/16/16/5508 |
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