CMAS penetration-induced cracking behavior in the ceramic top coat of APS TBCs
| Autor: | Weizhe Wang, Yingzheng Liu, Zhenwei Cai, Jishen Jiang, Zhaomin Cao |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Process Chemistry and Technology 02 engineering and technology Penetration (firestop) 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Stress level Thermal barrier coating Cracking Plasma sprayed visual_art 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic Penetration process Composite material 0210 nano-technology |
| Zdroj: | Ceramics International. 45:14366-14375 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2019.04.152 |
| Popis: | The penetration of calcium-magnesium-alumino-silicate (CMAS) is one of the most vital factors inducing the failure of air plasma sprayed thermal barrier coatings (APS TBCs). In present study, a two-dimensional periodical model considering the microstructures in ceramic top coat (TC) is built to study the cracking behavior in the TC of APS TBCs penetrated by CMAS during the cooling process. The CMAS penetration process is considered by filling the microstructures with the same shape of CMAS. The results show that CMAS penetration into the microstructures of the TC changed the stress distribution around the microstructures and induced a mixed crack type here. A microstructure with a relatively sharper geometry will experience a more severe stress state when penetrated by CMAS. The material discontinuity due to CMAS penetration also causes a slightly higher stress level around the microstructure at the CMAS deposit/TC interface, the CMAS penetrated layer and TC/BC interface. Thus, the horizontal cracks are easier to initiate from the microstructures with sharper geometry in these three regions. |
| Databáze: | OpenAIRE |
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