Effect of pyrolysis temperature on the mechanical evolution of SiCf/SiC composites fabricated by PIP |
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| Affiliation: | 1. Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, China;2. School of Material Science and Engineering, Shanghai University, Shanghai, 200444, China;1. International Laboratory for Insulation and Energy Efficiency Materials, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, PR China;2. Composite Materials Research Laboratory, Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260-4400, USA;3. Suzhou Superlong Aviation Heat Resistance Material Technology Co.,Ltd, Suzhou, 215400, PR China;4. College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, PR China;5. Center of Materials Physics and Chemistry, School of Physics and Nuclear Energy Engineering, Beijing University of Aeronautics and Astronautics, Beijing, 100191, PR China;6. Jiangsu Collaborative Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 210016, PR China;7. Yixing Huaheng High Performance Textile Co., Ltd, Yixing, 214216, PR China |
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| Abstract: | Three types of SiCf/SiC composites with a four-step three-dimensional SiC fibre preform and pyrocarbon interface fabricated via precursor infiltration and pyrolysis at 1100 °C, 1300 °C, and 1500 °C were heat-treated at 1300 °C under argon atmosphere for 50 h. The effects of the pyrolysis temperature on the microstructural and mechanical properties of the SiCf/SiC composites were studied. With an increase in the pyrolysis temperature, the SiC crystallite size of the as-fabricated composites increased from 3.4 to 6.4 nm, and the flexural strength decreased from 742 ± 45 to 467 ± 38 MPa. After heat treatment, all the samples exhibited lower mechanical properties, accompanied by grain growth, mass loss, and the formation of open pores. The degree of mechanical degradation decreased with an increase in the pyrolysis temperature. The composites fabricated at 1500 °C exhibited the highest property retention rates with 90% flexural strength and 98% flexural modulus retained. The mechanism of the mechanical evolution after heat treatment was revealed, which suggested that the thermal stability of the mechanical properties is enhanced by the high crystallinity of the SiC matrix after pyrolysis at higher temperatures. |
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| Keywords: | Pyrolysis temperature Microstructure Mechanical properties Heat treatment |
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