Reactive brazing of silicon nitride to Invar alloy using Ni foam and AgCuTi intermediate layers |
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| Affiliation: | 1. School of Mechanical Engineering and Automation, Beihang University, Beijing, 100191, China;2. School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, 102617, China;3. AVIC Chengdu Aircraft Industrial (Group) Co. Ltd., Chengdu, 610073, China;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2. Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China;3. Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518000, China;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China;2. Shandong Provincial Key Lab of Special Welding Technology, 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: | Silicon nitride (Si3N4) ceramic and Invar alloy have been brazed by using AgCuTi active filler and the Ni foam was added to further improve mechanical properties of joints in this study. The microstructure of Si3N4/Invar brazed joint changed obviously after adding Ni foam with different thickness. Ni foam reacted with the AgCuTi active filler during brazing, but it did not completely disappear and still maintained the basic frame structure after brazing. The average shear strength of the brazed joints with 0.2 mm Ni foam could reach 180 MPa, and their thermal cycle lifetime also improved significantly. The addition of Ni foam shifted the fracture location of joints from Si3N4 ceramic to brazing seam. These results indicated that the Ni foam could act as a buffer layer to reduce the residual thermal stress, and improve the mechanical properties of Si3N4/Invar joint. |
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| Keywords: | Invar alloy Braze Ni foam Mechanical properties |
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