Evolutions of mechanical and thermal properties of TmNbO4/Tm3NbO7 composites as protective coating materials
High fracture toughness, low thermal conductivity, and thermal expansion coefficient (TEC) matching substrate are essential for thermal barrier coatings (TBCs) and abradable seal coatings (ASCs). In this work, TmNbO4/Tm3NbO7 composites are designed and synthesized to increase their fracture toughnes...
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| Format: | Article |
| Language: | English |
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Tsinghua University Press
2024-11-01
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| Series: | Journal of Advanced Ceramics |
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| Online Access: | https://www.sciopen.com/article/10.26599/JAC.2024.9220973 |
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| author | Jiankun Wang Lin Chen Baihui Li Hao Xu Xiang Jiang Jing-Feng Li Jing Feng |
| author_facet | Jiankun Wang Lin Chen Baihui Li Hao Xu Xiang Jiang Jing-Feng Li Jing Feng |
| author_sort | Jiankun Wang |
| collection | DOAJ |
| description | High fracture toughness, low thermal conductivity, and thermal expansion coefficient (TEC) matching substrate are essential for thermal barrier coatings (TBCs) and abradable seal coatings (ASCs). In this work, TmNbO4/Tm3NbO7 composites are designed and synthesized to increase their fracture toughness (KIC) and thermal insulation performance. Compared with those of TmNbO4 (KIC = 2.2±0.1 MPa·m1/2) and Tm3NbO7 (KIC = 1.7±0.2 MPa·m1/2), the increments in fracture toughness are as high as 50.0% and 91.1%, respectively. The highest toughness reaches 3.3±0.4 MPa·m1/2, which is attributed to the superior combination of grains between TmNbO4 and Tm3NbO7, as well as the simultaneous effects of microcracks and crack bridging and bifurcation. Accurate estimation of the effect of the interfacial thermal resistance on the thermal conductivity at low temperatures was achieved using the minimum interfacial thermal resistance model. A novel method is proposed to inhibit radiative heat transfer by utilizing oxides with glass-like thermal conductivity to suppress thermal radiation. Consequently, the TmNbO4/Tm3NbO7 composite maintains a low thermal conductivity (1.19–2.02 W·m−1·K−1) at 1000 °C. The high TECs (10.4×10−6–11.8×10−6·K−1 at 1500 °C) and excellent high-temperature stability ensure that the designed TmNbO4/Tm3NbO7 composites can be used at temperatures reaching 1500 °C. Accordingly, simultaneous enhancement of fracture toughness and thermal insulation in TmNbO4/Tm3NbO7 composites is effective, and the revealed mechanisms are useful for various materials. |
| format | Article |
| id | doaj-art-7dbb65d2efb54f34b7a7958c3425b2a0 |
| institution | DOAJ |
| issn | 2226-4108 2227-8508 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Tsinghua University Press |
| record_format | Article |
| series | Journal of Advanced Ceramics |
| spelling | doaj-art-7dbb65d2efb54f34b7a7958c3425b2a02025-08-20T02:50:44ZengTsinghua University PressJournal of Advanced Ceramics2226-41082227-85082024-11-0113111771178510.26599/JAC.2024.9220973Evolutions of mechanical and thermal properties of TmNbO4/Tm3NbO7 composites as protective coating materialsJiankun Wang0Lin Chen1Baihui Li2Hao Xu3Xiang Jiang4Jing-Feng Li5Jing Feng6Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaSouthwest United Graduate School, Kunming 650092, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaHigh fracture toughness, low thermal conductivity, and thermal expansion coefficient (TEC) matching substrate are essential for thermal barrier coatings (TBCs) and abradable seal coatings (ASCs). In this work, TmNbO4/Tm3NbO7 composites are designed and synthesized to increase their fracture toughness (KIC) and thermal insulation performance. Compared with those of TmNbO4 (KIC = 2.2±0.1 MPa·m1/2) and Tm3NbO7 (KIC = 1.7±0.2 MPa·m1/2), the increments in fracture toughness are as high as 50.0% and 91.1%, respectively. The highest toughness reaches 3.3±0.4 MPa·m1/2, which is attributed to the superior combination of grains between TmNbO4 and Tm3NbO7, as well as the simultaneous effects of microcracks and crack bridging and bifurcation. Accurate estimation of the effect of the interfacial thermal resistance on the thermal conductivity at low temperatures was achieved using the minimum interfacial thermal resistance model. A novel method is proposed to inhibit radiative heat transfer by utilizing oxides with glass-like thermal conductivity to suppress thermal radiation. Consequently, the TmNbO4/Tm3NbO7 composite maintains a low thermal conductivity (1.19–2.02 W·m−1·K−1) at 1000 °C. The high TECs (10.4×10−6–11.8×10−6·K−1 at 1500 °C) and excellent high-temperature stability ensure that the designed TmNbO4/Tm3NbO7 composites can be used at temperatures reaching 1500 °C. Accordingly, simultaneous enhancement of fracture toughness and thermal insulation in TmNbO4/Tm3NbO7 composites is effective, and the revealed mechanisms are useful for various materials.https://www.sciopen.com/article/10.26599/JAC.2024.9220973thermal barrier coatings (tbcs)toughening mechanismscompositesthermal conductivitythermal expansionthermal radiation |
| spellingShingle | Jiankun Wang Lin Chen Baihui Li Hao Xu Xiang Jiang Jing-Feng Li Jing Feng Evolutions of mechanical and thermal properties of TmNbO4/Tm3NbO7 composites as protective coating materials Journal of Advanced Ceramics thermal barrier coatings (tbcs) toughening mechanisms composites thermal conductivity thermal expansion thermal radiation |
| title | Evolutions of mechanical and thermal properties of TmNbO4/Tm3NbO7 composites as protective coating materials |
| title_full | Evolutions of mechanical and thermal properties of TmNbO4/Tm3NbO7 composites as protective coating materials |
| title_fullStr | Evolutions of mechanical and thermal properties of TmNbO4/Tm3NbO7 composites as protective coating materials |
| title_full_unstemmed | Evolutions of mechanical and thermal properties of TmNbO4/Tm3NbO7 composites as protective coating materials |
| title_short | Evolutions of mechanical and thermal properties of TmNbO4/Tm3NbO7 composites as protective coating materials |
| title_sort | evolutions of mechanical and thermal properties of tmnbo4 tm3nbo7 composites as protective coating materials |
| topic | thermal barrier coatings (tbcs) toughening mechanisms composites thermal conductivity thermal expansion thermal radiation |
| url | https://www.sciopen.com/article/10.26599/JAC.2024.9220973 |
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