Impact of Brazing Temperature on Microstructure and Mechanical Properties ofNi200 Alloys Joints by Vacuum Brazing Using Nanosilver Pastes
WEN Li1, XUE Songbai1, MA Chaoli1, LONG Weimin2, ZHONG Sujuan2
1 College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 2 State Key Laboratory of Advanced Brazing Filler Metals and Technology, Zhengzhou Research Institute of Mechanical Engineering Co., Ltd., Zhengzhou 450001
Abstract: The nanosilver solder pastes prepared by improved polyol method exhibited favorable stability and linear micro-morphology mostly. The composition and melting point of the prepared nanosilver pastes were measured by XRD and DSC, respectively. Subsequently, nickel(Ni200) alloys were brazed in vacuum with the prepared nanosliver paste, and the impact of brazing temperature on the microstructure and properties of brazed joint were investigated. It can be found in the results that the sintering temperature increase is beneficial to the density improving of the sintered structure in the joint and the interdiffusion between the atoms at the interface, thus enhances the shear strength of the brazed joints. Howe-ver, excessively high temperature will lead to a slight drop in the property of joints. The brazed joints present a maximum shear strength of 42.5 MPa at 850 ℃, which is about 912% higher than that at 300 ℃.
1 Li Y J, Xia C Z, Shi L. Modern Welding Technology,2010,7(28),1(in Chinese). 李亚江,夏春智,石磊.现代焊接,2010,7(28),1. 2 Tang Z J, Guo T M, Fu Y, et al. Metal World,2014(1),36(in Chinese). 唐中杰,郭铁明,付迎,等.金属世界,2014(1),36. 3 Wang G, Zhang B G, He J S, et al. Transactions of the China Welding Institution,2008,29(7),89(in Chinese). 王刚,张秉刚,何景山,等.焊接学报,2008,29(7),89. 4 Tang Z Z, Chen P Y, Wu W. Transactions of the China Welding Institution,2008,29(1),109(in Chinese). 唐正柱,陈佩寅,吴伟.焊接学报,2008,29(1),109. 5 Cox D C, Roebuck B, Rae C M F, et al. Materials Science & Technology,2003,19(4),440. 6 Herring C. Journal of Applied Physics,1950,21(4),301. 7 Akada Y, Tatsumi H, Yamaguchi T, et al. Materials Transactions,2008,49(7),1537. 8 Yang X. Study on preparation and performance of low temperature sintered silver nanoparticle paste. Master’s thesis, Harbin Institute of Technology, China,2016(in Chinese). 杨雪.低温烧结纳米银膏的制备及其性能研究.硕士学位论文,哈尔滨工业大学,2016. 9 Xiang H Y, Gao G M, Huang P D, et al. Materials Reviews,2016,30(z1),64(in Chinese). 向红印,高官明,黄培德,等.材料导报,2016,30(z1),64. 10 Yang C X, Li X, Kong Y F, et al. Chinese Journal of Luminescence,2016(1),94(in Chinese). 杨呈祥,李欣,孔亚飞,等.发光学报,2016(1),94. 11 Paknejad S A, Mannan S H. Microelectronics Reliability,2017,70,1. 12 Alarifi H, Hu A, Yavuz M, et al. Journal of Electronic Materials,2011,40(6),1394. 13 Hausner S, Weis S, Wagner G. DVS-Berichte,2016,325,278. 14 Coskun S, Aksoy B, Unalan H E. Crystal Growth & Design,2011,11(11),4963.