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Microstructure control of highly oriented short carbon fibres in SiC matrix composites fabricated by direct ink writing
Affiliation:1. State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi''an Jiaotong University, Xi''an, 710049, China;2. National Institute Corporation of Additive Manufacturing, Yan Xiang Road No. 99, Yan Ta District, Xi''an, 710049, China;3. AECC Beijing Institute of Aeronautical Materials, Wenquan Town, Hai Dian District, Beijing, 100191, China;1. State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China;2. Lightweight Optics and Advanced Materials Technology Center, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdum, 610200, China;1. State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi''an Jiaotong University, 710054, Xi''an, Shaanxi, China;2. National Laboratory of Broadband Gap Semiconductor Technology, School of Microelectronics, Xi ''an University of Electronic Science and Technology, 710126, Xi ''an, Shaanxi, China;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, Human Province, China;2. School of Materials Science and Engineering, Central South University, Changsha 410083, Human Province, China;1. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130033, China;2. Key Laboratory of Optical System Advanced Manufacturing Technology, Chinese Academy of Sciences, Changchun, Jilin, 130033, China;3. Technology and Engineering Center for Space Utilization, Chinese Academy of Sciences, Beijing, 100094, China
Abstract:A novel method is proposed for fabricating highly oriented carbon fibre reinforced SiC ceramic composites (Cf/SiC) by direct ink writing (DIW). For the first time, the control of carbon fibers’ orientation in DIW was studied by numerical simulation. An interfacial layer was prepared by chemical vapor infiltration (CVI). The microstructure and phase composition of Cf/SiC were studied by scanning electron microscopy and X-ray diffraction, respectively. The results showed that fibers of different interfacial thicknesses could be obtained effectively by varying the CVI time. The breakage of short fibres remarkably improved the fracture toughness of the parts. The specimens showed excellent mechanical properties with bending strength of 274 ± 13 MPa and fracture toughness of 5.82 ± 0.25 MPa m1/2. This method could be extended to the preparation of other resin and ceramic composites.
Keywords:Direct ink writing  Highly oriented carbon fibres  SiC ceramic composites  Interfacial layer
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