Microstructure and Mechanical Properties of Unidirectional, Laminated C<i><sub>f</sub></i>/SiC Composites with α-Al<sub>2</sub>O<sub>3</sub> Nanoparticles as Filler
The effects of an α-Al<sub>2</sub>O<sub>3</sub> nanoparticle filler in the SiC matrix on the mechanical properties and failure mechanism of the unidirectional, laminated carbon fiber-reinforced SiC composites were investigated in this work. First, α-Al<sub>2</sub>...
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MDPI AG
2022-09-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/19/3406 |
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| author | Lixia Yang Fei Wang Jiahao Liao Zhaofeng Chen Zongde Kou |
| author_facet | Lixia Yang Fei Wang Jiahao Liao Zhaofeng Chen Zongde Kou |
| author_sort | Lixia Yang |
| collection | DOAJ |
| description | The effects of an α-Al<sub>2</sub>O<sub>3</sub> nanoparticle filler in the SiC matrix on the mechanical properties and failure mechanism of the unidirectional, laminated carbon fiber-reinforced SiC composites were investigated in this work. First, α-Al<sub>2</sub>O<sub>3</sub> nanoparticles were added to the carbon fiber bundles using a slurry impregnation method, and then the C<i><sub>f</sub></i>/SiC composite with an α-Al<sub>2</sub>O<sub>3</sub> nanoparticle filler (C<i><sub>f</sub></i>/SiC-Al<sub>2</sub>O<sub>3</sub>) was fabricated using a precursor infiltration and pyrolysis method. The microstructure of the C<i><sub>f</sub></i>/SiC-Al<sub>2</sub>O<sub>3</sub> composite showed chemical compatibility between the α-Al<sub>2</sub>O<sub>3</sub> and the pyrolysis SiC. The C<i><sub>f</sub></i>/SiC-Al<sub>2</sub>O<sub>3</sub> composite with a low porosity of ~6.67% achieved a good flexural strength of 629.3 MPa and a good fracture toughness of 25.2 MPa·m<sup>1/2</sup>. The interlaminar shear strength of the C<i><sub>f</sub></i>/SiC-Al<sub>2</sub>O<sub>3</sub> composite was 11.7 MPa. The SiC-Al<sub>2</sub>O<sub>3</sub> matrix also presented a considerable Young’s modulus of 138.2 ± 8.66 GPa and hardness of 10.3 ± 1.03 GPa. Further analysis indicated that the good mechanical properties with the addition of an α-Al<sub>2</sub>O3 filler were not only related to the dense matrix and the improvement of the mechanical properties of the matrix. They also originated from the thermal residual compressive stress in the SiC matrix close to the α-Al<sub>2</sub>O<sub>3</sub> nanoparticles caused by the thermal expansion mismatch, which could reflect and close the cracks in the matrix. The findings of this study provide more methods for designing new composites exhibiting a good performance. |
| first_indexed | 2024-03-09T21:21:29Z |
| format | Article |
| id | doaj.art-2175d7e4d5234626a4979495d81506ba |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T21:21:29Z |
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| spelling | doaj.art-2175d7e4d5234626a4979495d81506ba2023-11-23T21:19:34ZengMDPI AGNanomaterials2079-49912022-09-011219340610.3390/nano12193406Microstructure and Mechanical Properties of Unidirectional, Laminated C<i><sub>f</sub></i>/SiC Composites with α-Al<sub>2</sub>O<sub>3</sub> Nanoparticles as FillerLixia Yang0Fei Wang1Jiahao Liao2Zhaofeng Chen3Zongde Kou4College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, 29 Yudao St., Nanjing 210016, ChinaCollege of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, 29 Yudao St., Nanjing 210016, ChinaCollege of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, 29 Yudao St., Nanjing 210016, ChinaCollege of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, 29 Yudao St., Nanjing 210016, ChinaHerbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaThe effects of an α-Al<sub>2</sub>O<sub>3</sub> nanoparticle filler in the SiC matrix on the mechanical properties and failure mechanism of the unidirectional, laminated carbon fiber-reinforced SiC composites were investigated in this work. First, α-Al<sub>2</sub>O<sub>3</sub> nanoparticles were added to the carbon fiber bundles using a slurry impregnation method, and then the C<i><sub>f</sub></i>/SiC composite with an α-Al<sub>2</sub>O<sub>3</sub> nanoparticle filler (C<i><sub>f</sub></i>/SiC-Al<sub>2</sub>O<sub>3</sub>) was fabricated using a precursor infiltration and pyrolysis method. The microstructure of the C<i><sub>f</sub></i>/SiC-Al<sub>2</sub>O<sub>3</sub> composite showed chemical compatibility between the α-Al<sub>2</sub>O<sub>3</sub> and the pyrolysis SiC. The C<i><sub>f</sub></i>/SiC-Al<sub>2</sub>O<sub>3</sub> composite with a low porosity of ~6.67% achieved a good flexural strength of 629.3 MPa and a good fracture toughness of 25.2 MPa·m<sup>1/2</sup>. The interlaminar shear strength of the C<i><sub>f</sub></i>/SiC-Al<sub>2</sub>O<sub>3</sub> composite was 11.7 MPa. The SiC-Al<sub>2</sub>O<sub>3</sub> matrix also presented a considerable Young’s modulus of 138.2 ± 8.66 GPa and hardness of 10.3 ± 1.03 GPa. Further analysis indicated that the good mechanical properties with the addition of an α-Al<sub>2</sub>O3 filler were not only related to the dense matrix and the improvement of the mechanical properties of the matrix. They also originated from the thermal residual compressive stress in the SiC matrix close to the α-Al<sub>2</sub>O<sub>3</sub> nanoparticles caused by the thermal expansion mismatch, which could reflect and close the cracks in the matrix. The findings of this study provide more methods for designing new composites exhibiting a good performance.https://www.mdpi.com/2079-4991/12/19/3406ceramic matrix compositeC<i><sub>f</sub></i>/SiC compositesα-Al<sub>2</sub>O<sub>3</sub> nanoparticle fillermechanical properties |
| spellingShingle | Lixia Yang Fei Wang Jiahao Liao Zhaofeng Chen Zongde Kou Microstructure and Mechanical Properties of Unidirectional, Laminated C<i><sub>f</sub></i>/SiC Composites with α-Al<sub>2</sub>O<sub>3</sub> Nanoparticles as Filler Nanomaterials ceramic matrix composite C<i><sub>f</sub></i>/SiC composites α-Al<sub>2</sub>O<sub>3</sub> nanoparticle filler mechanical properties |
| title | Microstructure and Mechanical Properties of Unidirectional, Laminated C<i><sub>f</sub></i>/SiC Composites with α-Al<sub>2</sub>O<sub>3</sub> Nanoparticles as Filler |
| title_full | Microstructure and Mechanical Properties of Unidirectional, Laminated C<i><sub>f</sub></i>/SiC Composites with α-Al<sub>2</sub>O<sub>3</sub> Nanoparticles as Filler |
| title_fullStr | Microstructure and Mechanical Properties of Unidirectional, Laminated C<i><sub>f</sub></i>/SiC Composites with α-Al<sub>2</sub>O<sub>3</sub> Nanoparticles as Filler |
| title_full_unstemmed | Microstructure and Mechanical Properties of Unidirectional, Laminated C<i><sub>f</sub></i>/SiC Composites with α-Al<sub>2</sub>O<sub>3</sub> Nanoparticles as Filler |
| title_short | Microstructure and Mechanical Properties of Unidirectional, Laminated C<i><sub>f</sub></i>/SiC Composites with α-Al<sub>2</sub>O<sub>3</sub> Nanoparticles as Filler |
| title_sort | microstructure and mechanical properties of unidirectional laminated c i sub f sub i sic composites with α al sub 2 sub o sub 3 sub nanoparticles as filler |
| topic | ceramic matrix composite C<i><sub>f</sub></i>/SiC composites α-Al<sub>2</sub>O<sub>3</sub> nanoparticle filler mechanical properties |
| url | https://www.mdpi.com/2079-4991/12/19/3406 |
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