Revealing the oxidation growth mechanism and crack evolution law of novel Si–HfO2/Yb2Si2O7/Yb2SiO5 environmental barrier coatings during thermal cycling
The development of Si–HfO2/Yb2Si2O7/Yb2SiO5 environmental barrier coatings (EBCs) aims to improve the operational temperature and longevity of ceramic matrix composites (CMCs) in turbine environments. Nevertheless, several critical questions remain unanswered, including the oxidation mechanism of Si...
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| Format: | Article |
| Language: | English |
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Tsinghua University Press
2024-10-01
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| Series: | Journal of Advanced Ceramics |
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| Online Access: | https://www.sciopen.com/article/10.26599/JAC.2024.9220969 |
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| author | Ruixiang Liu Wenping Liang Qiang Miao Hui Zhao Xiaofeng Zhang Meng Zhang Rongxue Yan Brindha Ramasubramanian Seeram Ramakrishna |
| author_facet | Ruixiang Liu Wenping Liang Qiang Miao Hui Zhao Xiaofeng Zhang Meng Zhang Rongxue Yan Brindha Ramasubramanian Seeram Ramakrishna |
| author_sort | Ruixiang Liu |
| collection | DOAJ |
| description | The development of Si–HfO2/Yb2Si2O7/Yb2SiO5 environmental barrier coatings (EBCs) aims to improve the operational temperature and longevity of ceramic matrix composites (CMCs) in turbine environments. Nevertheless, several critical questions remain unanswered, including the oxidation mechanism of Si–HfO2 bond coating, the compatibility of its mixed thermally grown oxide (m-TGO) with adjacent layers during thermal cycling, and the evolution pattern of vertical mud-cracks that impact the overall performance in service. Using plasma spraying physical vapor deposition (PS-PVD), we fabricated these EBCs on a CMC substrate, and thermal cycling tests at 1400, 1450, and 1500 °C revealed that their durability reached 200 h. m-TGO growth followed a parabolic model, with the oxygen diffusion activation energy being 133.69 kJ/mol between 1400 and 1450 °C and 101.47 kJ/mol from 1450 to 1500 °C, emphasizing that the transport of molecular oxygen is key to controlling the oxidation of m-TGO in this EBC system. Although residual stresses and stored elastic strain energy build up between m-TGO and adjacent layers, especially around the cristobalite phase transition temperature, causing interlaminar crack formation in later thermal cycles, the stored elastic strain energy remains lower than that of the silicon oxide–thermally grown oxide (SiO2–TGO) formed in Si bond coating system. In addition to [110] dislocations, (001) twinning and interaction zones between twinning and dislocations were discovered for the first time, driving the bifurcation of mud cracks. Notably, controlling the mud-crack density is vital for protection of Yb2SiO5 layer, as bifurcated mud-crack tips may converge with adjacent mud-cracks. |
| format | Article |
| id | doaj-art-8192ee3c2c514f03bd5c7d55d9f84ea9 |
| institution | Kabale University |
| issn | 2226-4108 2227-8508 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | Tsinghua University Press |
| record_format | Article |
| series | Journal of Advanced Ceramics |
| spelling | doaj-art-8192ee3c2c514f03bd5c7d55d9f84ea92024-11-11T03:49:25ZengTsinghua University PressJournal of Advanced Ceramics2226-41082227-85082024-10-0113101677169610.26599/JAC.2024.9220969Revealing the oxidation growth mechanism and crack evolution law of novel Si–HfO2/Yb2Si2O7/Yb2SiO5 environmental barrier coatings during thermal cyclingRuixiang Liu0Wenping Liang1Qiang Miao2Hui Zhao3Xiaofeng Zhang4Meng Zhang5Rongxue Yan6Brindha Ramasubramanian7Seeram Ramakrishna8College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaCollege of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaCollege of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaCollege of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaNational Engineering Laboratory for Modern Materials Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, ChinaCollege of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaCollege of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaDepartment of Mechanical Engineering, National University of Singapore, Singapore 117575, SingaporeDepartment of Mechanical Engineering, National University of Singapore, Singapore 117575, SingaporeThe development of Si–HfO2/Yb2Si2O7/Yb2SiO5 environmental barrier coatings (EBCs) aims to improve the operational temperature and longevity of ceramic matrix composites (CMCs) in turbine environments. Nevertheless, several critical questions remain unanswered, including the oxidation mechanism of Si–HfO2 bond coating, the compatibility of its mixed thermally grown oxide (m-TGO) with adjacent layers during thermal cycling, and the evolution pattern of vertical mud-cracks that impact the overall performance in service. Using plasma spraying physical vapor deposition (PS-PVD), we fabricated these EBCs on a CMC substrate, and thermal cycling tests at 1400, 1450, and 1500 °C revealed that their durability reached 200 h. m-TGO growth followed a parabolic model, with the oxygen diffusion activation energy being 133.69 kJ/mol between 1400 and 1450 °C and 101.47 kJ/mol from 1450 to 1500 °C, emphasizing that the transport of molecular oxygen is key to controlling the oxidation of m-TGO in this EBC system. Although residual stresses and stored elastic strain energy build up between m-TGO and adjacent layers, especially around the cristobalite phase transition temperature, causing interlaminar crack formation in later thermal cycles, the stored elastic strain energy remains lower than that of the silicon oxide–thermally grown oxide (SiO2–TGO) formed in Si bond coating system. In addition to [110] dislocations, (001) twinning and interaction zones between twinning and dislocations were discovered for the first time, driving the bifurcation of mud cracks. Notably, controlling the mud-crack density is vital for protection of Yb2SiO5 layer, as bifurcated mud-crack tips may converge with adjacent mud-cracks.https://www.sciopen.com/article/10.26599/JAC.2024.9220969environmental barrier coatings (ebcs)thermal cyclingoxidationcrack propagationdefects |
| spellingShingle | Ruixiang Liu Wenping Liang Qiang Miao Hui Zhao Xiaofeng Zhang Meng Zhang Rongxue Yan Brindha Ramasubramanian Seeram Ramakrishna Revealing the oxidation growth mechanism and crack evolution law of novel Si–HfO2/Yb2Si2O7/Yb2SiO5 environmental barrier coatings during thermal cycling Journal of Advanced Ceramics environmental barrier coatings (ebcs) thermal cycling oxidation crack propagation defects |
| title | Revealing the oxidation growth mechanism and crack evolution law of novel Si–HfO2/Yb2Si2O7/Yb2SiO5 environmental barrier coatings during thermal cycling |
| title_full | Revealing the oxidation growth mechanism and crack evolution law of novel Si–HfO2/Yb2Si2O7/Yb2SiO5 environmental barrier coatings during thermal cycling |
| title_fullStr | Revealing the oxidation growth mechanism and crack evolution law of novel Si–HfO2/Yb2Si2O7/Yb2SiO5 environmental barrier coatings during thermal cycling |
| title_full_unstemmed | Revealing the oxidation growth mechanism and crack evolution law of novel Si–HfO2/Yb2Si2O7/Yb2SiO5 environmental barrier coatings during thermal cycling |
| title_short | Revealing the oxidation growth mechanism and crack evolution law of novel Si–HfO2/Yb2Si2O7/Yb2SiO5 environmental barrier coatings during thermal cycling |
| title_sort | revealing the oxidation growth mechanism and crack evolution law of novel si hfo2 yb2si2o7 yb2sio5 environmental barrier coatings during thermal cycling |
| topic | environmental barrier coatings (ebcs) thermal cycling oxidation crack propagation defects |
| url | https://www.sciopen.com/article/10.26599/JAC.2024.9220969 |
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