Processing and mechanical performance of 3D Cf/SiCN composites prepared by polymer impregnation and pyrolysis |
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| Affiliation: | 1. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Heilong Jiang, Harbin, 150080, China;2. Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology, Harbin Institute of Technology, Heilong Jiang, Harbin, 150080, China;3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Heilong Jiang, Harbin, 150001, China;1. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150080 China;2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China;3. Department of Materials Engineering, Monash University, Clayton, VIC 3800, Australia;1. Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institut für Bauweisen und Strukturtechnologie, Pfaffenwaldring 38-40, 70569, Stuttgart, Germany;2. Technische Universität Darmstadt, Institut für Materialwissenschaft, Otto-Berndt-Str. 3, 64287, Darmstadt, Germany;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150080, China;1. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Heilong Jiang, Harbin, 150080, China;2. Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology, Harbin Institute of Technology, Heilong Jiang, Harbin, 150080, China;3. Suzhou Automotive Research Institute, Tsinghua University, Jiangsu, Suzhou, 215000, China;4. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China;1. Technische Universität Darmstadt, Institut für Materialwissenschaft, Jovanka-Bontschits-Straße 2, D-64287, Darmstadt, Germany;2. DECHEMA-Forschungsinstitut, High Temperature Materials, Theodor-Heuss-Allee 25, 60486 Frankfurt am Main, Germany;3. Science and Technology on Thermal Structural Composite Materials Laboratory, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, PR China;4. Universität zu Köln, Institut für Anorganische Chemie, Greinstrasse 6, D-50939 Köln, Germany |
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| Abstract: | The processing of 3D carbon fiber reinforced SiCN ceramic matrix composites prepared by polymer impregnation and pyrolysis (PIP) route was improved, and factors that determined the mechanical performance of the resulting composites were discussed. 3D Cf/SiCN composites with a relative density of ∼81% and uniform microstructure were obtained after 6 PIP cycles. The optimum bending strength, Young's modulus and fracture toughness of the composites were 75.2 MPa, 66.3 GPa and 1.65 MPa m1/2, respectively. The residual strength retention rate of the as-pyrolyzed composites was 93.3% after thermal shock test at ΔT = 780 °C. It further degraded to 14.6% when the thermal shock temperature difference reached to 1180 °C. The bending strength of the composites was 35.6 MPa after annealing at 1000 °C in static air. The deterioration of the bending strength should be attributed to the strength degradation of carbon fibers and decomposition of interfacial structure. |
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| Keywords: | SiCN Carbon fiber PIP Mechanical properties High-temperature properties |
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