High-temperature properties and interface evolution of C/SiBCN composites prepared by precursor infiltration and pyrolysis |
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| Affiliation: | 1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, China;2. Northwest Institute of Nuclear Technology, Xi’an, 710024, China;1. State Key Laboratory of High-Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China;2. University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing, 100039, China;1. Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China;2. Guangdong Key Laboratory of Membrane Materials and Membrane Separation, Guangzhou Institute of Advanced Technology, Chinese Academy of Sciences, Guangzhou 511452, China |
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| Abstract: | C/SiBCN composites with a density of 1.64 g/cm3 were prepared via precursor infiltration and pyrolysis and the bending strength and modulus at room temperature was 305 MPa and 53.5 GPa. The precursor derived SiBCN ceramics showed good thermal stability at 1600 °C and the SiC and Si3N4 crystals appeared above 1700 °C. The bending strength of the composites was 180 MPa after heat treatment at 1500 °C, and maintained at 40 MPa-50 MPa after heat treatment for 2 h at 1600 °C–1900 °C. In C/SiBCN composites, SiBCN matrix could retain amorphous up to 1500 °C and SiC grains appeared at 1600 °C but without Si3N4. The reason for no detection of Si3N4 was that the carbon fiber reacted with Si3N4 to form an interface layer (composed of SiC and unreacted C) and a polycrystalline transition layer (composed of B and C elements), leading to the degradation of the mechanical properties. |
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| Keywords: | C/SiBCN composites Microstructure High-temperature properties Interface evolution Precursor infiltration and pyrolysis |
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