Surface microstructure evolution of Cf/SiC ceramic matrix composite microgrooves processed by ultrafast laser |
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| Affiliation: | 1. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China;2. AVIC Chengdu Aircraft Industrial (Group) Co., Ltd., Chengdu, China;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 Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China;2. Zhongyuan Critical Metals Laboratory, Zhengzhou, 450001, China;1. Xidian University, School of Aerospace Science and Technology, 266 Xifeng Road, Xi’an, 710126, PR China;2. Xidian University, School of Microelectronics, Xi''an, China, Key Laboratory of Wide Band-Gap Semiconductors and Devices, Xi''an, 710126, 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 |
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| Abstract: | Modern aviation components have higher requirements for high temperature resistance, high strength and lightweight materials, and ceramic matrix composites have superior overall performance. However, its high brittleness and anisotropy lead to a challenge for manufacturing. In order to understand the formation conditions and the evolution of surface microstructures of the Cf/SiC microgrooves processed by ultrafast laser comprehensively, we designed a single-factor experiment and performed sensitivity analysis. The experiment results showed that the pulse energy had great effects on the depth of the microgroove, and the intense ablation caused more active oxidation of SiC to occur, generating more SiO(g). However, too much pulse energy may cause the material removal mechanism to be more due to the photothermal effect rather than the plasma effect. Low repetition frequency caused a large number of laminated connections in the microgroove and the oxide gradually changed from lumpy to flocculent as the repetition frequency increased. The more scanning times, the more ablation products sputtered onto the sample surface, including unablated carbon fibers. Shallow depth and ablation residues remained in the microgroove occurred under few scanning times. Although too fast scanning speed leaded to a rapid decrease in the microgroove depth, too slow scanning speed also generated more unablated carbon fibers sputtering out of the microgrooves. The microgroove depth had the highest sensitivity to the repetition frequency, followed by the pulse energy and scanning speed. The pulse energy and scanning speed had a greater effect on the oxide layer height, the repetition frequency affected the oxide layer width, and the scanning speed affected the microgroove width significantly. According to the processing requirements and the hot spot map, the processing parameters that can be adjusted effectively will be able to be obtained. |
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| Keywords: | Ceramic matrix composite (CMC) Ultrafast laser Microstructure Material removal mechanism |
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