A new route to fabricate SiB4 modified C/SiC composites |
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| Authors: | Fengming Shi Xiaowei Yin Xiaomeng Fan Laifei Cheng Litong Zhang |
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| Affiliation: | 1. Research Center for Composite Materials, Shanghai University, 200072 Shanghai, PR China;2. State Key Lab of Multi-phase Complex Systems, Institute of Process Engineering, CAS, 100190 Beijing, PR China;1. School of Aeronautics, Northwestern Polytechnical University, Xi''an, 710072, Shaanxi, China;2. Xi''an Modern Chemistry Research Institute, Xi''an, 710065, Shaanxi, China;3. Chang''an University, Xi''an, 710064, Shaanxi, China;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;2. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;3. Research Center for Composite Materials, Shanghai University, Shanghai 200072, PR China;1. Defence Metallurgical Research Laboratory, P.O. Kanchanbagh, Hyderabad, 500058. India;2. National Aerospace Laboratories, Bangalore, 560017. India;1. Nanjing University of Aeronautics and Astronautics, Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing 210016, PR China;2. Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Information Technology, PR China;3. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China |
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| Abstract: | In order to improve the oxidation and thermal shock resistance of 2D C/SiC composites, dense SiB4–SiC matrix was in situ formed in 2D C/SiC composites by a joint process of slurry infiltration and liquid silicon infiltration. The synthesis mechanism of SiB4 was investigated by analyzing the reaction products of B4C–Si system. Compared with the porous C/SiC composites, the density of C/SiC–SiB4 composites increased from 1.63 to 2.23 g/cm3 and the flexural strength increased from 135 to 330 MPa. The thermal shock behaviors of C/SiC and C/SiC–SiB4 composites protected with SiC coating were studied using the method of air quenching. C/SiC–SiB4 composites displayed good resistance to thermal shock, and retained 95% of the original strength after being quenched in air from 1300 °C to room temperature for 60 cycles, which showed less weight loss than C/SiC composite. |
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