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INTERFACIAL REACTION AND STRENGTHENING MECHANISM OF CERAMIC MATRIX COMPOSITE JOINTS USING LIQUID PHASE DIFFUSION BONDING WITH AUXILIARY PULSE CURRENT |
Mingfang WU1,Fei LIU2,Fengjiang WANG1( ),Yanxin QIAO1 |
1 Key Laboratory of Advanced Welding Technology of Jiangsu Province, Jiangsu University of Science and Technology, Zhenjiang 212003 2 Zhenjiang Institute of Technology, Zhenjiang 212000 |
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Cite this article:
Mingfang WU,Fei LIU,Fengjiang WANG,Yanxin QIAO. INTERFACIAL REACTION AND STRENGTHENING MECHANISM OF CERAMIC MATRIX COMPOSITE JOINTS USING LIQUID PHASE DIFFUSION BONDING WITH AUXILIARY PULSE CURRENT. Acta Metall Sin, 2015, 51(9): 1129-1135.
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Abstract Ceramic matrix composites (CMCs) is attracted in airspace and nuclear engineering due to their high temperature, corrosion and wearing resistance, but the usage is limited by the joining between CMC and other metals due to obvious incompatibility on physical and chemical aspects on them. The liquid phase-diffusion bonding (LPDB) on Ti(C, N)-Al2O3 CMC/Cu joint was studied using the Cu-Zr foil/Cu foil/Cu-Zr foil sanwich as an interlayer in this work. Auxiliary pulse current was also added to control the elemental diffusion and interfacial reaction during LPDB. The element diffusion and reacted products at the interface were analyzed with SEM, EPMA and EDS, and the joint strength was tested with four points bending method. The results show that with an auxiliary pulse current during LPDB, a higher joint strength is reached with a lower bonding temperature and a shorter holding time. The diffusion behavior of element Zr and Cu in CMC and the interfacial area is obviously changed, and the activity of Zr element and its chemical reaction with Al2O3 are depressed by the auxiliary pulse current during LPDB. The diffusion of ceramic partilces into the interface and the thickness of corresponding diffusion transition zone (DTZ) and Zr-Cu interfacial reaction zone (IRZ) at the interface are also depressed by the auxiliary pulse current, which strengthens the interface, and is always kept an higher joint strength.
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Fund: Supported by National Natural Science Foundation of China (No.51175239), Jiangsu Provincial Research Foundation for Basic Research (No.BK2011494) and College Natural Science Foundation of Jiangsu Province (No.11KJA430005) |
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