Influence of graphitization treatment on microstructure and flexural strength of C/C-ZrC-SiC composites fabricated via reactive melt infiltration |
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| Affiliation: | 1. Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. Center for Excellence in Ultra-intense Laser Science, Chinese Academy of Sciences, Shanghai, 201800, China;4. Shanghai Academy of Spaceflight Technology, Shanghai, 201109, China;1. School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan, 430074, PR China;2. Zhejiang Engineering Research Center of New Organic Functional Molecules Synthesis and Application, Wenzhou Institute of Industry & Science, Wenzhou, 325006, PR China;3. Wenzhou Advanced Manufacturing Institute, Huazhong University of Science and Technology, Wenzhou, 325006, PR China;1. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China;2. Zhongyuan Critical Metals Laboratory, Zhengzhou, 450001, China;1. Department of Physics, The University of Lahore, 53700, Pakistan;2. Department of Physics, Science Unit, Deanship of Educational Services, Qasim University, Buraidah, 51452, Saudi Arabia;3. Department of Physics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, Saudi Arabia;4. Department of Physics, College of Sciences, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh, 11671, Saudi Arabia;1. Additive Manufacturing Laboratory, Center for Materials Technologies, Skolkovo Institute of Science and Technology, 121205, Moscow, Russian Federation;2. Department of Materials Engineering, KU Leuven, 3001, Leuven, Belgium;1. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450000, China;2. Porcelain Gold Technology (Henan) Co. Ltd, Zhengzhou, 452470, China;3. Henan Polytechnic, Zhengzhou, 450046, China;4. School of 3D Printing, Xinxiang University, Xinxiang, 453003, China |
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| Abstract: | C/C-ZrC-SiC composites were prepared by chemical vapor infiltration (CVI) and molten salt assisted reactive melt infiltration (RMI). The microstructure of low density and high density C/C composites without graphitization (LC/HC) and graphitization at 2000 °C (LCG/HCG) were compared. Moreover, the effects of graphitization of LC and HC on the microstructure and flexural strength of C/C-ZrC-SiC composites were investigated in detail. The composites prepared by infiltration of LC and LCG had lower flexural strength, 220.01 ± 21.18 MPa and 197.94 ± 19.05 MPa, respectively. However, the composites prepared by HC and HCG presented higher flexural strength, 308.76 ± 12.35 MPa and 289.62 ± 8.70 MPa, respectively. This was due to the phenomenon of fiber erosion in both LC and LCG during the RMI process. After graphitization, the flexural strength of C/C-ZrC-SiC composites prepared by RMI decreased, but the fracture behavior of the composites tends to be more mild. The decreased strength of the composites were caused by the increased matrix cracks, fiber damage in high temperature and the weak interfacial bonding. The improve of failure behavior of the composites was due to interface debonding between the fiber and matrix, and composites can consume the fracture energy through fiber pull-out. |
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| Keywords: | C/C composites Graphitization Reactive melt infiltration C/C-ZrC-SiC composites Microstructure Flexural strength |
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