Reactive wetting behavior and mechanism of AlN ceramic by CuNi-Xwt%Ti active filler metal |
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| Affiliation: | 1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China;2. Faculty of Materials, Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, 341000, China;3. Department of Vehicle Engineering, Army Academy of Armored Forces, Beijing, 100072, China;1. School of Aviation and Materials, Anhui Technical College of Mechanical and Electrical Engineering, Wuhu 241002, China;2. Anhui Key Laboratory of High-performance Non-ferrous Metal Materials, Anhui Polytechnic University, Wuhu 241000, China;3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;4. Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, Finland;1. School of Mechanical Engineering, Chengdu University, Chengdu, 610106, PR China;2. School of Manufacturing Science and Engineering, Sichuan University, Chengdu, 610065, PR China;3. School of Electric Power Engineering, China University of Mining and Technology, Xuzhou, 221116, China;4. Advanced Research Institute, Chengdu University, Chengdu, 610106, PR China;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2. Laboratoire d’Études des Microstructures, CNRS-ONERA, Châtillon 92322, France |
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| Abstract: | In order to propel the application of the developed CuNi-Xwt%Ti active filler metal in AlN brazing and get the universal reactive wetting mechanism between liquid metal and solid ceramic, the reactive wetting behavior and mechanism of AlN ceramic by CuNi-Xwt%Ti active filler metal were investigated. The results indicate that, with the increasing Ti content, surface tension for liquid CuNi-Xwt%Ti filler metal increases at low-temperature interval, but very similar at high-temperature interval, which influence the wetting behavior on AlN ceramic obviously. CuNi/AlN is the typical non-reactive wetting system, the wetting process including rapid wetting stage and stable stage. The wettability is depended on surface tension of the liquid CuNi filler metal completely. However, the wetting process of CuNi-8wt.%Ti/AlN and CuNi-16 wt%Ti/AlN reactive wetting system is composed by three stages, which are rapid wetting stage decided by surface tension, slow wetting stage caused by interfacial reaction and stable stage. For CuNi-8wt.%Ti/AlN and CuNi-16 wt%Ti/AlN reactive wetting system, although the surface tension of liquid filler metal is the only factor to influence the instant wetting angle θ0 at rapid wetting stage, the reduced free energy caused by interfacial reaction at slow wetting stage plays the decisive role in influencing the final wettability. |
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| Keywords: | AlN ceramic Active brazing Reactive wetting Surface tension Interface reaction |
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