Effect of high-temperature heat treatment on the microstructure and mechanical behavior of PIP-based C/C-SiC composites with SiC filler |
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| Affiliation: | 1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China;2. School of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China;3. The 31st Research Institute of China Aerospace Science and Industry Corp, Beijing, 100074, China;4. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China;1. Department of Engineering Mechanics, Northwestern Polytechnical University, Xi’an, China;2. School of Mechano-Electronic Engineering, Xidian University, Xi’an, China;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. Structural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;2. Advanced Research Center, Central South University, Changsha 410083, China |
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| Abstract: | C/C-SiC composites were fabricated by a combined process of chemical vapor deposition (CVD), slurry infiltration(SI), and precursor infiltration and pyrolysis (PIP). The microstructure and mechanical behavior were investigated for the dense C/C-SiC composites before and after high-temperature heat treatment. The results indicated that the sintering of the SiC matrix and the migration of the SiC matrix/fiber bundles weak interface occurred after high-temperature heat treatment at 1900 ℃. The SiC sintering resulted in an increase in the flexural strength of the C/C-SiC composites from 298.9 ± 35.0 MPa to 411.1 ± 57.3 MPa. The migration of the weak interface changed the direction of crack propagation, making the fracture toughness of the C/C-SiC composites decrease from 13.3 ± 1.7 MPa?m 1/2 to 9.02 ± 1.5 MPa?m 1/2. |
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| Keywords: | C/C-SiC composites Microstructure Mechanical properties |
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