Achieving durable double-layered thermal barrier coatings by tailoring multi-scale structures
Double-layered thermal barrier coatings (DL-TBCs) have been developed to meet multiple service requirements, such as low thermal conductivity, high thermal stability, and high fracture toughness. Conventional DL-TBCs are often designed on the basis of equal total thickness to have long lifespans, wh...
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| Format: | Article |
| Language: | English |
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Tsinghua University Press
2024-12-01
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| Series: | Journal of Advanced Ceramics |
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| Online Access: | https://www.sciopen.com/article/10.26599/JAC.2024.9221002 |
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| author | Guang-Lei Liu Lin Zhu Xin-Yu Li Hussain Sajjad Xiang-Yu Song Guang-Rong Li Guan-Jun Yang |
| author_facet | Guang-Lei Liu Lin Zhu Xin-Yu Li Hussain Sajjad Xiang-Yu Song Guang-Rong Li Guan-Jun Yang |
| author_sort | Guang-Lei Liu |
| collection | DOAJ |
| description | Double-layered thermal barrier coatings (DL-TBCs) have been developed to meet multiple service requirements, such as low thermal conductivity, high thermal stability, and high fracture toughness. Conventional DL-TBCs are often designed on the basis of equal total thickness to have long lifespans, which may weaken the thermal insulation. The reason is that the single-scale designed structure often has opposite effects on the thermal and mechanical properties. To enhance both the thermal insulation and lifespan, this work designed durable DL-TBCs at multiple scales under equivalent thermal insulation. The macroscopic thickness ratio of the top layer to the bottom layer was tailored to optimize the total and single thicknesses, and the microscopic pore size in the top layer was tailored to resist sintering. Six groups of samples with different thickness ratios were prepared. The thermal cycling test revealed that the lifespan of DL-TBCs first increases but then decreases with increasing thickness ratio. The optimized thickness ratio is 2:3 for DL-TBCs, which have the largest lifespan among the six groups. The cross-sectional morphologies revealed that the failure mode changed from the spallation of the top layer to the delamination of the total double layers. The long lifespan of the optimized DL-TBCs stems from the cotailored thickness ratio and porous structure in the top layer to lower the total cracking driving force. |
| format | Article |
| id | doaj-art-28c2bc721f2e49639c8cd99ae83b6551 |
| institution | Kabale University |
| issn | 2226-4108 2227-8508 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Tsinghua University Press |
| record_format | Article |
| series | Journal of Advanced Ceramics |
| spelling | doaj-art-28c2bc721f2e49639c8cd99ae83b65512024-12-29T16:07:50ZengTsinghua University PressJournal of Advanced Ceramics2226-41082227-85082024-12-0113122068208610.26599/JAC.2024.9221002Achieving durable double-layered thermal barrier coatings by tailoring multi-scale structuresGuang-Lei Liu0Lin Zhu1Xin-Yu Li2Hussain Sajjad3Xiang-Yu Song4Guang-Rong Li5Guan-Jun Yang6State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaDouble-layered thermal barrier coatings (DL-TBCs) have been developed to meet multiple service requirements, such as low thermal conductivity, high thermal stability, and high fracture toughness. Conventional DL-TBCs are often designed on the basis of equal total thickness to have long lifespans, which may weaken the thermal insulation. The reason is that the single-scale designed structure often has opposite effects on the thermal and mechanical properties. To enhance both the thermal insulation and lifespan, this work designed durable DL-TBCs at multiple scales under equivalent thermal insulation. The macroscopic thickness ratio of the top layer to the bottom layer was tailored to optimize the total and single thicknesses, and the microscopic pore size in the top layer was tailored to resist sintering. Six groups of samples with different thickness ratios were prepared. The thermal cycling test revealed that the lifespan of DL-TBCs first increases but then decreases with increasing thickness ratio. The optimized thickness ratio is 2:3 for DL-TBCs, which have the largest lifespan among the six groups. The cross-sectional morphologies revealed that the failure mode changed from the spallation of the top layer to the delamination of the total double layers. The long lifespan of the optimized DL-TBCs stems from the cotailored thickness ratio and porous structure in the top layer to lower the total cracking driving force.https://www.sciopen.com/article/10.26599/JAC.2024.9221002thermal barrier coatings (tbcs)double-layered structuredominant factorsmultiscale designlong lifespan |
| spellingShingle | Guang-Lei Liu Lin Zhu Xin-Yu Li Hussain Sajjad Xiang-Yu Song Guang-Rong Li Guan-Jun Yang Achieving durable double-layered thermal barrier coatings by tailoring multi-scale structures Journal of Advanced Ceramics thermal barrier coatings (tbcs) double-layered structure dominant factors multiscale design long lifespan |
| title | Achieving durable double-layered thermal barrier coatings by tailoring multi-scale structures |
| title_full | Achieving durable double-layered thermal barrier coatings by tailoring multi-scale structures |
| title_fullStr | Achieving durable double-layered thermal barrier coatings by tailoring multi-scale structures |
| title_full_unstemmed | Achieving durable double-layered thermal barrier coatings by tailoring multi-scale structures |
| title_short | Achieving durable double-layered thermal barrier coatings by tailoring multi-scale structures |
| title_sort | achieving durable double layered thermal barrier coatings by tailoring multi scale structures |
| topic | thermal barrier coatings (tbcs) double-layered structure dominant factors multiscale design long lifespan |
| url | https://www.sciopen.com/article/10.26599/JAC.2024.9221002 |
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