Fabrication of improved flexural strength C/SiC composites via LA-CVI method using optimized spacing of mass transfer channels |
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| Affiliation: | 1. Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Dalian University of Technology) Ministry of Education, Dalian, 116024, China;2. School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, China;3. School of Mechanical and Power Engineering, Dalian Ocean University, Dalian, 116023, China |
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| Abstract: | The traditional chemical vapor infiltration (CVI) method still faces massive challenge in improving the densification owing to its unavoidable bottleneck effect. Herein, laser assisted-chemical vapor infiltration (LA-CVI) was introduced to fabricate C/SiC composites with mass transfer channels. As a result, the densities of the C/SiC composites were improved due to the dense band formed during the LA-CVI process. Also, with different spacing of mass transfer channels, C/SiC composites exhibited enhanced degree of densification varying from 2.10 to 2.23 g/cm3. When the spacing of channels was 3 mm, the maximum value of flexural strength reached 528 ± 12 MPa. Additionally, micro-CT and finite element analysis were empolyed to investigate dense band and density gradient in detail. The results show that C/SiC composites prepared via LA-CVI method with suitable spacing of channels had improved density and great flexural strength. The proposed method provides a novel route for the preparation of ceramic matrix composites with high density. |
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| Keywords: | C/SiC LA-CVI Mass transfer channel Flexural strength |
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