Achieving self-enhanced thermal barrier performance through a novel hybrid-layered coating design
The thermal insulation and durability of thermal barrier coatings (TBCs) are mainly affected by sintering-induced healing of 2D micropores, which is inevitable under high temperature conditions. In this study, we designed and prepared novel hybrid-layered TBCs. During thermal exposure, the degree of...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2019-04-01
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| Series: | Materials & Design |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S026412751930084X |
| _version_ | 1818440657483595776 |
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| author | Guang-Rong Li Li-Shuang Wang Guan-Jun Yang |
| author_facet | Guang-Rong Li Li-Shuang Wang Guan-Jun Yang |
| author_sort | Guang-Rong Li |
| collection | DOAJ |
| description | The thermal insulation and durability of thermal barrier coatings (TBCs) are mainly affected by sintering-induced healing of 2D micropores, which is inevitable under high temperature conditions. In this study, we designed and prepared novel hybrid-layered TBCs. During thermal exposure, the degree of degradation in thermal conductivity is observed to decrease from 80 to 100% for conventional coatings to ~20% for the novel coatings. For a detailed understanding, the evolution of the hybrid-layered TBCs can be divided into two stages: during stage I (0−10 h), ultrafast healing of 2D micropores occurs, mainly caused by the multiple contacts between the counter-surface. At this stage, the thermal and mechanical properties also increase sharply. During stage II (after 10 h), some new 2D mesopores are formed. Compared with the 2D micropores, the newly formed 2D mesopores have a much larger aspect ratio that increases the ratio of the effective area for thermal insulation from 10 to 30% to 60%, which accounts for the ~50% self-enhancement in the thermal barrier performance. This self-enhancing behavior is expected to prolong the lifetime and increase the performance of the TBCs, which is the main objective of using advanced TBCs in next-generation applications. Keywords: Thermal barrier coatings, Sintering, Structure design, Degradation-resistance, Self-enhancing |
| first_indexed | 2024-12-14T18:15:50Z |
| format | Article |
| id | doaj.art-28c816c767c740a7b066b20b57872f20 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-12-14T18:15:50Z |
| publishDate | 2019-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-28c816c767c740a7b066b20b57872f202022-12-21T22:52:11ZengElsevierMaterials & Design0264-12752019-04-01167Achieving self-enhanced thermal barrier performance through a novel hybrid-layered coating designGuang-Rong Li0Li-Shuang Wang1Guan-Jun Yang2State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, ChinaSchool of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, ChinaState Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China; Corresponding author at: State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.The thermal insulation and durability of thermal barrier coatings (TBCs) are mainly affected by sintering-induced healing of 2D micropores, which is inevitable under high temperature conditions. In this study, we designed and prepared novel hybrid-layered TBCs. During thermal exposure, the degree of degradation in thermal conductivity is observed to decrease from 80 to 100% for conventional coatings to ~20% for the novel coatings. For a detailed understanding, the evolution of the hybrid-layered TBCs can be divided into two stages: during stage I (0−10 h), ultrafast healing of 2D micropores occurs, mainly caused by the multiple contacts between the counter-surface. At this stage, the thermal and mechanical properties also increase sharply. During stage II (after 10 h), some new 2D mesopores are formed. Compared with the 2D micropores, the newly formed 2D mesopores have a much larger aspect ratio that increases the ratio of the effective area for thermal insulation from 10 to 30% to 60%, which accounts for the ~50% self-enhancement in the thermal barrier performance. This self-enhancing behavior is expected to prolong the lifetime and increase the performance of the TBCs, which is the main objective of using advanced TBCs in next-generation applications. Keywords: Thermal barrier coatings, Sintering, Structure design, Degradation-resistance, Self-enhancinghttp://www.sciencedirect.com/science/article/pii/S026412751930084X |
| spellingShingle | Guang-Rong Li Li-Shuang Wang Guan-Jun Yang Achieving self-enhanced thermal barrier performance through a novel hybrid-layered coating design Materials & Design |
| title | Achieving self-enhanced thermal barrier performance through a novel hybrid-layered coating design |
| title_full | Achieving self-enhanced thermal barrier performance through a novel hybrid-layered coating design |
| title_fullStr | Achieving self-enhanced thermal barrier performance through a novel hybrid-layered coating design |
| title_full_unstemmed | Achieving self-enhanced thermal barrier performance through a novel hybrid-layered coating design |
| title_short | Achieving self-enhanced thermal barrier performance through a novel hybrid-layered coating design |
| title_sort | achieving self enhanced thermal barrier performance through a novel hybrid layered coating design |
| url | http://www.sciencedirect.com/science/article/pii/S026412751930084X |
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