Effects of initial density during laser machining assisted CVI process and its influence on strength of C/SiC composites |
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| Affiliation: | 1. State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China;2. State Key Laboratory of Environment-friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, China;3. Engineering Research Center of Ceramic Materials for Additive Manufacturing, Ministry of Education, Wuhan, 430074, China;1. School of Mechanical and Precision Instrument Engineering, Xi''an University of Technology, Xi’an, 710048, China;2. State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an, 710049, China;3. Department of Design, Manufacture and Engineering Management, University of Strathclyde, Glasgow, G1 1JX, United Kingdom;1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, PR China;2. School of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, PR China;1. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Center for Advanced Jet Engineering Technologies (CaJET), Key Laboratory of High-Efficiency and Clean Mechanical Manufacture (Ministry of Education), School of Mechanical Engineering, Shandong University, Jinan 250061, China;3. School of Mechanical and Manufacturing Engineering, The University of New South Wales (UNSW), Sydney, NSW 2052, Australia |
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| Abstract: | Novel laser-assisted chemical vapor infiltration (LA-CVI) technique has been used to improve the density and strength of carbon fiber reinforced SiC composites (C/SiC). Initial density of C/SiC before laser machining played an important role in determining the final density and strength of composites. Results show that final density and bending strength of lower initial density composites were better than that of higher initial density samples after LA-CVI process, while the porosity exhibited opposite behavior. Micro-CT and COMSEL simulation results verify that after LA-CVI process, dense band width of C/SiC with initial density of 1.5 g/cm3 was twice as that of C/SiC with initial density of 1.8 g/cm3. This led to crack propagation bypassing the micro-hole. In conclusion, low initial density when laser machining was carried out resulted in better properties of final composites. |
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| Keywords: | C/SiC composites Micro-structure LA-CVI Bending strength |
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