Microstructure and tensile behavior of (BN/SiC)n coated SiC fibers and SiC/SiC minicomposites |
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| Affiliation: | 1. National Key Laboratory of Advanced Composites, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, PR China;2. College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, No.29 Jiangjun Ave., Nanjing 211106, PR China;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2. School of Aerospace Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China;3. Heilongjiang Provincial Key Laboratory of CO2 Resource Utilization and Energy Catalytic Materials, School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, China;1. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;2. Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;3. Qianwan Institute of CNiTECH, Ningbo 315336, China;4. University of Chinese Academy of Sciences, Beijing 100049, 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;3. School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China;1. School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China;2. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;1. Department of Inorganic Materials, Institute of Inorganic Technology and Materials, FCHFT STU, Radlinského 9, Bratislava, Slovakia;2. RHP-Technology GmbH, Austrian Research Center, 2444 Seibersdorf, Austria;3. Aerospace & Advanced Composites GmbH, Viktor-Kaplan-Strasse 2, 2700 Wiener Neustadt, Austria;4. Institute of Plastic, Rubber and Fibers, FCHFT STU, Radlinského 9, Bratislava, Slovakia;5. Institute of Materials and Machine Mechanics SAV v. v. i., Dúbravská cesta 9/6319, Bratislava, Slovakia;6. Institute of Process Engineering, FME STU, Námestie Slobody 17, Bratislava, Slovakia;7. Department of Machining and Forming, Institute of Production Technologies, FMST STU, Jána Bottu 25, Trnava 917 24, Slovakia;8. Comenius University, Faculty of Natural Sciences, Department of Physical and Theoretical Chemistry, Mlynská dolina, Ilkovi?ova 6, CH1, SK-84215 Bratislava, Slovakia;9. Department of Inorganic Materials, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovakia;10. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 36 Bratislava, Slovakia |
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| Abstract: | Interphase plays an important role in the mechanical behavior of SiC/SiC ceramic-matrix composites (CMCs). In this paper, the microstructure and tensile behavior of multilayered (BN/SiC)n coated SiC fiber and SiC/SiC minicomposites were investigated. The surface roughness of the original SiC fiber and SiC fiber deposited with multilayered (BN/SiC), (BN/SiC)2, and (BN/SiC)4 (BN/SiC)8 interphase was analyzed through the scanning electronic microscope (SEM) and atomic force microscope (AFM) and X-ray diffraction (XRD) analysis. Monotonic tensile experiments were conducted for original SiC fiber, SiC fiber with different multilayered (BN/SiC)n interfaces, and SiC/SiC minicomposites. Considering multiple damage mechanisms, e.g., matrix cracking, interface debonding, and fibers failure, a damage-based micromechanical constitutive model was developed to predict the tensile stress-strain response curves. Multiple damage parameters (e.g., matrix cracking stress, saturation matrix crack stress, tensile strength and failure strain, and composite’s tangent modulus) were used to characterize the tensile damage behavior in SiC/SiC minicomposites. Effects of multilayered interphase on the interface shear stress, fiber characteristic strength, tensile damage and fracture behavior, and strength distribution in SiC/SiC minicomposites were analyzed. The deposited multilayered (BN/SiC)n interphase protected the SiC fiber and increased the interface shear stress, fiber characteristic strength, leading to the higher matrix cracking stress, saturation matrix cracking stress, tensile strength and fracture strain. |
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| Keywords: | SiC/SiC Multilayed interphase Crack propagation Interface debonding Tensile Damage Fracture |
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