Interfacial microstructure and mechanical properties of porous-Si3N4 ceramic and TiAl alloy joints vacuum brazed with AgCu filler |
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| Affiliation: | 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 at Weihai, Weihai 264209, China;3. Science and Technology on Advanced Functional Composites Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2. Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, China;3. Department of Mechanical Engineering, University of Kentucky, Lexington, 40506, USA;1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China;2. Joining and Welding Research Institute, Osaka University, Osaka 567–0047, Japan;3. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;2. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Joining Technologies and Corrosion, CH-8600 Dübendorf, Switzerland;1. School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang, 110136, China;2. School of Mechanical Engineering and Automation, Beihang University, Beijing, 100191, China;3. AECC Shenyang Liming Aero Engine Co., Ltd, Shenyang, 110043, China;4. CRRC Academy Co., Ltd, Beijing, 100070, 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 at Weihai, Weihai 264209, China;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;2. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Joining Technologies and Corrosion, CH-8600 Dübendorf, Switzerland |
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| Abstract: | Porous Si3N4 ceramic was firstly joined to TiAl alloy using an AgCu filler alloy. The effects of brazing temperature and holding time on the interfacial microstructure and mechanical properties of porous-Si3N4/AgCu/TiAl joints were studied. The typical interfacial microstructure of joints brazed at 880 °C for 15 min was TiAl/AlCu2Ti/Ag-Cu eutectic/penetration layer (Ti5Si3+TiN, Si3N4, Ag (s, s), Cu (s, s))/porous-Si3N4. The penetration layer was formed firstly in the brazing process. With increasing brazing temperature and time, the thickness of the penetration layer increased. A large amount of element Ti was consumed in the penetration layer which suppressed the formation and growth of other intermetallic compounds. The penetration layer led the fracture to propagate in the porous Si3N4 ceramic substrate. The maximum shear strength was ~13.56 MPa. |
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| Keywords: | TiAl alloy Brazing Interfacial microstructure Mechanical property |
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