Nanoscratch Testing of 3Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub> EBCs: Assessment of Induced Damage and Estimation of Adhesion Strength
In this study, the structural integrity of mullite (3Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub>) films, deposited on silicon carbide (SiC) substrates using chemical vapor deposition (CVD), was investigated via increasing load nanoscratch tests. The films were co...
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| Format: | Article |
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MDPI AG
2023-03-01
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| Series: | Ceramics |
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| Online Access: | https://www.mdpi.com/2571-6131/6/1/40 |
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| author | Carlos Alberto Botero Laura Cabezas Vinod Kumar Sarin Luis Llanes Emilio Jiménez-Piqué |
| author_facet | Carlos Alberto Botero Laura Cabezas Vinod Kumar Sarin Luis Llanes Emilio Jiménez-Piqué |
| author_sort | Carlos Alberto Botero |
| collection | DOAJ |
| description | In this study, the structural integrity of mullite (3Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub>) films, deposited on silicon carbide (SiC) substrates using chemical vapor deposition (CVD), was investigated via increasing load nanoscratch tests. The films were configured by mullite columns of stoichiometric composition growing from a silica-rich layer in contact with the SiC substrate. Controlled damage was induced in the 3Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub> films at relatively low scratch loads. Radial and lateral cracking were applied until final delamination and repeated chipping were achieved as the load increased. The intrinsic integrity of the 3Al<sub>2</sub>O<sub>3</sub>∙2SiO<sub>2</sub> film and the performance of the coated 3Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub>/SiC system, regarded as a structural unit, were analyzed. With the aid of advanced characterization techniques at the surface and subsurface levels, the configuration and morphology of the damage induced in the coated system by the nanoscratch tests were characterized, and the scratch damage micromechanisms were identified. Finally, the adhesion of the film, in terms of energy of adhesion and interfacial fracture toughness, was determined using different models proposed in the literature. The results from this investigation contribute to the understanding of the mechanical performance and structural integrity of EBC/SiC-based systems, which over the past few years have increasingly been implemented in novel applications for gas turbines and aircraft engines. |
| first_indexed | 2024-03-11T06:46:17Z |
| format | Article |
| id | doaj.art-07a23bfdaf9d47f8bacf0aac3ceabbca |
| institution | Directory Open Access Journal |
| issn | 2571-6131 |
| language | English |
| last_indexed | 2024-03-11T06:46:17Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Ceramics |
| spelling | doaj.art-07a23bfdaf9d47f8bacf0aac3ceabbca2023-11-17T10:15:01ZengMDPI AGCeramics2571-61312023-03-016166467710.3390/ceramics6010040Nanoscratch Testing of 3Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub> EBCs: Assessment of Induced Damage and Estimation of Adhesion StrengthCarlos Alberto Botero0Laura Cabezas1Vinod Kumar Sarin2Luis Llanes3Emilio Jiménez-Piqué4CIEFMA, Department of Materials Science and Engineering, Campus Diagonal Besòs-EEBE, Universitat Politècnica de Catalunya, 08019 Barcelona, SpainCIEFMA, Department of Materials Science and Engineering, Campus Diagonal Besòs-EEBE, Universitat Politècnica de Catalunya, 08019 Barcelona, SpainDepartment of Mechanical Engineering, Boston University, 110 Cummington Street, Boston, MA 02215, USACIEFMA, Department of Materials Science and Engineering, Campus Diagonal Besòs-EEBE, Universitat Politècnica de Catalunya, 08019 Barcelona, SpainCIEFMA, Department of Materials Science and Engineering, Campus Diagonal Besòs-EEBE, Universitat Politècnica de Catalunya, 08019 Barcelona, SpainIn this study, the structural integrity of mullite (3Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub>) films, deposited on silicon carbide (SiC) substrates using chemical vapor deposition (CVD), was investigated via increasing load nanoscratch tests. The films were configured by mullite columns of stoichiometric composition growing from a silica-rich layer in contact with the SiC substrate. Controlled damage was induced in the 3Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub> films at relatively low scratch loads. Radial and lateral cracking were applied until final delamination and repeated chipping were achieved as the load increased. The intrinsic integrity of the 3Al<sub>2</sub>O<sub>3</sub>∙2SiO<sub>2</sub> film and the performance of the coated 3Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub>/SiC system, regarded as a structural unit, were analyzed. With the aid of advanced characterization techniques at the surface and subsurface levels, the configuration and morphology of the damage induced in the coated system by the nanoscratch tests were characterized, and the scratch damage micromechanisms were identified. Finally, the adhesion of the film, in terms of energy of adhesion and interfacial fracture toughness, was determined using different models proposed in the literature. The results from this investigation contribute to the understanding of the mechanical performance and structural integrity of EBC/SiC-based systems, which over the past few years have increasingly been implemented in novel applications for gas turbines and aircraft engines.https://www.mdpi.com/2571-6131/6/1/40nanoscratchthin filmsmulliteenergy of adhesioninterfacial fracture toughness |
| spellingShingle | Carlos Alberto Botero Laura Cabezas Vinod Kumar Sarin Luis Llanes Emilio Jiménez-Piqué Nanoscratch Testing of 3Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub> EBCs: Assessment of Induced Damage and Estimation of Adhesion Strength Ceramics nanoscratch thin films mullite energy of adhesion interfacial fracture toughness |
| title | Nanoscratch Testing of 3Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub> EBCs: Assessment of Induced Damage and Estimation of Adhesion Strength |
| title_full | Nanoscratch Testing of 3Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub> EBCs: Assessment of Induced Damage and Estimation of Adhesion Strength |
| title_fullStr | Nanoscratch Testing of 3Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub> EBCs: Assessment of Induced Damage and Estimation of Adhesion Strength |
| title_full_unstemmed | Nanoscratch Testing of 3Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub> EBCs: Assessment of Induced Damage and Estimation of Adhesion Strength |
| title_short | Nanoscratch Testing of 3Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub> EBCs: Assessment of Induced Damage and Estimation of Adhesion Strength |
| title_sort | nanoscratch testing of 3al sub 2 sub o sub 3 sub ·2sio sub 2 sub ebcs assessment of induced damage and estimation of adhesion strength |
| topic | nanoscratch thin films mullite energy of adhesion interfacial fracture toughness |
| url | https://www.mdpi.com/2571-6131/6/1/40 |
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