A novel laser welding process with in-situ fibrous carbon precipitation strengthening interface for C/C composites |
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| Affiliation: | 1. Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China;2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;1. National Key Laboratory of Science and Technology on High-strength Structural Materials, Central South University, Changsha 410083, PR China;2. School of Metallurgy and Environment, Central South University, Changsha 410083, PR China;1. Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, PR China;2. Beijing Mechanical Equipment Institute, Beijing 100039, PR China;3. College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, No.29 Jiangjun Ave., Nanjing 211106, PR China;4. School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China |
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| Abstract: | To enable online joining and installation of large-sized C/C components with high-temperature resistance requirements, a novel laser welding process utilizing Ni as filler material was proposed for joining C/C composites. The results show that, under inert gas protection, the laser beam melts the Ni filler to form a stable molten pool and heats the C/C substrates. In the localized high-temperature environment, eutectic reaction occurs between the Ni molten pool and the C/C substrates, resulting in partial dissolution of the C/C substrates into the liquid Ni. As the joining proceeds, the Ni molten pool solidifies, and most of the dissolved C precipitates in the weld seam and at the C/C/weld seam interfaces to form fibrous carbon. The fibrous C that precipitates at the interface tends to grow perpendicularly to it, thus strengthening the joining interfaces. The highest average three-point bending strength of the joint was measured to be 59 ± 7 MPa. |
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| Keywords: | C/C composite Laser welding Precipitation strengthening Interface |
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