Mechanisms governing the enhanced strain tolerance of segmented APS-TBCs
Surface cracks are recognized as an effective approach for enhancing the strain tolerance of air plasma sprayed thermal barrier coating system (APS-TBCs). Therefore, segmented APS-TBCs with channeled surface cracks is considered a superior coating system for improving the combustion efficiency of ad...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-05-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127525002977 |
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| _version_ | 1849387074053996544 |
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| author | Liuyu Yang Yiwen Chen Dingjun Li Peng Jiang |
| author_facet | Liuyu Yang Yiwen Chen Dingjun Li Peng Jiang |
| author_sort | Liuyu Yang |
| collection | DOAJ |
| description | Surface cracks are recognized as an effective approach for enhancing the strain tolerance of air plasma sprayed thermal barrier coating system (APS-TBCs). Therefore, segmented APS-TBCs with channeled surface cracks is considered a superior coating system for improving the combustion efficiency of advanced engines. However, the underlying mechanism responsible for its enhanced strain tolerance and service durability compared to conventional ones have not yet been fully elucidated. This article reveals this mechanism by investigating the residual stress evolutions in segmented and conventional APS-TBCs. We fabricate both types of APS-TBC samples and conduct isothermal cyclic oxidation service on them. Then, we measure the residual stresses of YSZ TC and TGO using Raman spectroscopy (RS) method and Photoluminescence piezo-spectroscopy (PLPS) method, respectively. Experimental results indicate that the segmented sample exhibited 2.5 times of service durability compared to the conventional sample. Through detailed analysis, we find that the macro-compliance mechanisms played a crucial role in governing the enhanced service performance of segmented samples. This macro-compliance effect is achieved by lowering the residual stress at given stain level through surface cracks, and thus results in improved interfacial integrity compared to conventional ones. The discoveries in this study contribute towards comprehending microstructure design and selection of APS-TBCs. |
| format | Article |
| id | doaj-art-3f8716f1295e484da348e08cf152adeb |
| institution | Kabale University |
| issn | 0264-1275 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj-art-3f8716f1295e484da348e08cf152adeb2025-08-20T03:55:22ZengElsevierMaterials & Design0264-12752025-05-0125311387710.1016/j.matdes.2025.113877Mechanisms governing the enhanced strain tolerance of segmented APS-TBCsLiuyu Yang0Yiwen Chen1Dingjun Li2Peng Jiang3State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an 710049, China; State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment, Dongfang Steam Turbine Co., Ltd., Deyang 618000, ChinaState Key Laboratory of Clean and Efficient Turbomachinery Power Equipment, Dongfang Steam Turbine Co., Ltd., Deyang 618000, ChinaState Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an 710049, China; Corresponding author.Surface cracks are recognized as an effective approach for enhancing the strain tolerance of air plasma sprayed thermal barrier coating system (APS-TBCs). Therefore, segmented APS-TBCs with channeled surface cracks is considered a superior coating system for improving the combustion efficiency of advanced engines. However, the underlying mechanism responsible for its enhanced strain tolerance and service durability compared to conventional ones have not yet been fully elucidated. This article reveals this mechanism by investigating the residual stress evolutions in segmented and conventional APS-TBCs. We fabricate both types of APS-TBC samples and conduct isothermal cyclic oxidation service on them. Then, we measure the residual stresses of YSZ TC and TGO using Raman spectroscopy (RS) method and Photoluminescence piezo-spectroscopy (PLPS) method, respectively. Experimental results indicate that the segmented sample exhibited 2.5 times of service durability compared to the conventional sample. Through detailed analysis, we find that the macro-compliance mechanisms played a crucial role in governing the enhanced service performance of segmented samples. This macro-compliance effect is achieved by lowering the residual stress at given stain level through surface cracks, and thus results in improved interfacial integrity compared to conventional ones. The discoveries in this study contribute towards comprehending microstructure design and selection of APS-TBCs.http://www.sciencedirect.com/science/article/pii/S0264127525002977Conventional coatingsSegmented coatingsSurface cracksResidual stressRaman spectroscopyPhoto-luminescence piezo-spectroscopy |
| spellingShingle | Liuyu Yang Yiwen Chen Dingjun Li Peng Jiang Mechanisms governing the enhanced strain tolerance of segmented APS-TBCs Materials & Design Conventional coatings Segmented coatings Surface cracks Residual stress Raman spectroscopy Photo-luminescence piezo-spectroscopy |
| title | Mechanisms governing the enhanced strain tolerance of segmented APS-TBCs |
| title_full | Mechanisms governing the enhanced strain tolerance of segmented APS-TBCs |
| title_fullStr | Mechanisms governing the enhanced strain tolerance of segmented APS-TBCs |
| title_full_unstemmed | Mechanisms governing the enhanced strain tolerance of segmented APS-TBCs |
| title_short | Mechanisms governing the enhanced strain tolerance of segmented APS-TBCs |
| title_sort | mechanisms governing the enhanced strain tolerance of segmented aps tbcs |
| topic | Conventional coatings Segmented coatings Surface cracks Residual stress Raman spectroscopy Photo-luminescence piezo-spectroscopy |
| url | http://www.sciencedirect.com/science/article/pii/S0264127525002977 |
| work_keys_str_mv | AT liuyuyang mechanismsgoverningtheenhancedstraintoleranceofsegmentedapstbcs AT yiwenchen mechanismsgoverningtheenhancedstraintoleranceofsegmentedapstbcs AT dingjunli mechanismsgoverningtheenhancedstraintoleranceofsegmentedapstbcs AT pengjiang mechanismsgoverningtheenhancedstraintoleranceofsegmentedapstbcs |