Joining of Cf/SiC composite and 304 stainless steel assisted by surface honeycomb modification |
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| Affiliation: | 1. School of Mechanical Engineering and Automation, Beihang University, Beijing, 100191, China;2. AECC Hunan Aviation Powerplant Research Institute, Zhuzhou, 412002, China;3. China Academy of Space Technology, Beijing, 100081, China;4. State Key Laboratory of Advanced Brazing Filler Metals & Technology, Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou, 450001, China;5. China Innovation Academy of Intelligent Equipment (Ningbo) Co., LTD, Ningbo, 315700, China;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China;3. MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China |
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| Abstract: | A novel surface honeycomb modification was developed by pre-oxidizing the Cf/SiC composite, and the honeycomb modified Cf/SiC composite and stainless steel were brazed with AgCuTi filler. Results showed that a honeycomb-like surface with dense pores could be obtained when the Cf/SiC composite was air-oxidized at 700°C. During the brazing process, the liquid filler infiltrated into the pores and formed an infiltrated area, which not only significantly increased the bonding area between the reaction layer and the Cf/SiC composite, but also effectively hindered the crack propagation due to the nailing/pinning effect. The Finite Element simulation displayed that the infiltrated area transferred the stress concentration away from the reaction layer, dispersed the residual stress and reduced the corresponding stress value. As the result, the maximum shear strength of the joint reached 158MPa, which is multiple times higher than the joint without surface honeycomb modification. |
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| Keywords: | Stainless steel Surface honeycomb modification Nailing effect Relieving residual stress |
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