A New Al2O3‐Protected EB‐PVD TBC with Superior CMAS Resistance
Abstract Calcium‐magnesium‐aluminium‐silicate (CMAS) attack is a longstanding challenge for yttria stabilized zirconia (YSZ) thermal barrier coatings (TBCs) particularly at higher engine operating temperature. Here, a novel microstructural design is reported for YSZ TBCs to mitigate CMAS attack. The...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2024-02-01
|
| Series: | Advanced Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/advs.202305479 |
| _version_ | 1797329388378783744 |
|---|---|
| author | Shiying Qin Huatang Cao Zhaohe Gao Gyn Brewster João P. Martin Ying Chen Ping Xiao |
| author_facet | Shiying Qin Huatang Cao Zhaohe Gao Gyn Brewster João P. Martin Ying Chen Ping Xiao |
| author_sort | Shiying Qin |
| collection | DOAJ |
| description | Abstract Calcium‐magnesium‐aluminium‐silicate (CMAS) attack is a longstanding challenge for yttria stabilized zirconia (YSZ) thermal barrier coatings (TBCs) particularly at higher engine operating temperature. Here, a novel microstructural design is reported for YSZ TBCs to mitigate CMAS attack. The design is based on a drip coating method that creates a thin layer of nanoporous Al2O3 around YSZ columnar grains produced by electron beam physical vapor deposition (EB‐PVD). The nanoporous Al2O3 enables fast crystallization of CMAS melt close to the TBC surface, in the inter‐columnar gaps, and on the column walls, thereby suppressing CMAS infiltration and preventing further degradation of the TBCs due to CMAS attack. Indentation and three‐point beam bending tests indicate that the highly porous Al2O3 only slightly stiffens the TBC but offers superior resistance against sintering in long‐term thermal exposure by reducing the intercolumnar contact. This work offers a new pathway for designing novel TBC architecture with excellent CMAS resistance, strain tolerance, and sintering resistance, which also points out new insight for assembly nanoporous ceramic in traditional ceramic structure for integrated functions. |
| first_indexed | 2024-03-08T07:05:04Z |
| format | Article |
| id | doaj.art-aa42dcd18c3a4851bc78978a2281e30d |
| institution | Directory Open Access Journal |
| issn | 2198-3844 |
| language | English |
| last_indexed | 2024-03-08T07:05:04Z |
| publishDate | 2024-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advanced Science |
| spelling | doaj.art-aa42dcd18c3a4851bc78978a2281e30d2024-02-03T05:02:44ZengWileyAdvanced Science2198-38442024-02-01115n/an/a10.1002/advs.202305479A New Al2O3‐Protected EB‐PVD TBC with Superior CMAS ResistanceShiying Qin0Huatang Cao1Zhaohe Gao2Gyn Brewster3João P. Martin4Ying Chen5Ping Xiao6Department of Materials and Henry Royce Institute University of Manchester Manchester M13 9PL UKDepartment of Materials and Henry Royce Institute University of Manchester Manchester M13 9PL UKDepartment of Materials and Henry Royce Institute University of Manchester Manchester M13 9PL UKRolls‐Royce plc PO. Box 31 Derby DE24 8BJ UKDepartment of Materials and Henry Royce Institute University of Manchester Manchester M13 9PL UKDepartment of Materials and Henry Royce Institute University of Manchester Manchester M13 9PL UKDepartment of Materials and Henry Royce Institute University of Manchester Manchester M13 9PL UKAbstract Calcium‐magnesium‐aluminium‐silicate (CMAS) attack is a longstanding challenge for yttria stabilized zirconia (YSZ) thermal barrier coatings (TBCs) particularly at higher engine operating temperature. Here, a novel microstructural design is reported for YSZ TBCs to mitigate CMAS attack. The design is based on a drip coating method that creates a thin layer of nanoporous Al2O3 around YSZ columnar grains produced by electron beam physical vapor deposition (EB‐PVD). The nanoporous Al2O3 enables fast crystallization of CMAS melt close to the TBC surface, in the inter‐columnar gaps, and on the column walls, thereby suppressing CMAS infiltration and preventing further degradation of the TBCs due to CMAS attack. Indentation and three‐point beam bending tests indicate that the highly porous Al2O3 only slightly stiffens the TBC but offers superior resistance against sintering in long‐term thermal exposure by reducing the intercolumnar contact. This work offers a new pathway for designing novel TBC architecture with excellent CMAS resistance, strain tolerance, and sintering resistance, which also points out new insight for assembly nanoporous ceramic in traditional ceramic structure for integrated functions.https://doi.org/10.1002/advs.202305479CMASnanoporous Al2O3sintering resistanceTBCs |
| spellingShingle | Shiying Qin Huatang Cao Zhaohe Gao Gyn Brewster João P. Martin Ying Chen Ping Xiao A New Al2O3‐Protected EB‐PVD TBC with Superior CMAS Resistance Advanced Science CMAS nanoporous Al2O3 sintering resistance TBCs |
| title | A New Al2O3‐Protected EB‐PVD TBC with Superior CMAS Resistance |
| title_full | A New Al2O3‐Protected EB‐PVD TBC with Superior CMAS Resistance |
| title_fullStr | A New Al2O3‐Protected EB‐PVD TBC with Superior CMAS Resistance |
| title_full_unstemmed | A New Al2O3‐Protected EB‐PVD TBC with Superior CMAS Resistance |
| title_short | A New Al2O3‐Protected EB‐PVD TBC with Superior CMAS Resistance |
| title_sort | new al2o3 protected eb pvd tbc with superior cmas resistance |
| topic | CMAS nanoporous Al2O3 sintering resistance TBCs |
| url | https://doi.org/10.1002/advs.202305479 |
| work_keys_str_mv | AT shiyingqin anewal2o3protectedebpvdtbcwithsuperiorcmasresistance AT huatangcao anewal2o3protectedebpvdtbcwithsuperiorcmasresistance AT zhaohegao anewal2o3protectedebpvdtbcwithsuperiorcmasresistance AT gynbrewster anewal2o3protectedebpvdtbcwithsuperiorcmasresistance AT joaopmartin anewal2o3protectedebpvdtbcwithsuperiorcmasresistance AT yingchen anewal2o3protectedebpvdtbcwithsuperiorcmasresistance AT pingxiao anewal2o3protectedebpvdtbcwithsuperiorcmasresistance AT shiyingqin newal2o3protectedebpvdtbcwithsuperiorcmasresistance AT huatangcao newal2o3protectedebpvdtbcwithsuperiorcmasresistance AT zhaohegao newal2o3protectedebpvdtbcwithsuperiorcmasresistance AT gynbrewster newal2o3protectedebpvdtbcwithsuperiorcmasresistance AT joaopmartin newal2o3protectedebpvdtbcwithsuperiorcmasresistance AT yingchen newal2o3protectedebpvdtbcwithsuperiorcmasresistance AT pingxiao newal2o3protectedebpvdtbcwithsuperiorcmasresistance |