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| Phase Composition and Formation Mechanism of Diffusion Transition Zone for Silver-based Brazing Alloys with Tin Coatings |
| WANG Xingxing1, TAN Qunyan1, XUE Peng2, TANG Mingqi1, LONG Weimin3
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1 School of Mechanical Engineering,North China University of Water Resources and Electric Power, Zhengzhou 450045;
2 School of Materials Science and Engineering,Nanjing University of Science and Technology, Nanjing 210094;
3 State Key Laboratory of Advanced Brazing Filler Metals and Technology,Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou 450001 |
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Abstract Silver-based brazing alloys with tin coatings were thermally diffused using temperature gradient method,and diffusion transition zone would occur. In order to reveal the compound phases and its formation process of silver-based brazing alloys with tin coatings, the microstructure, mapping images of Sn, phase and morphology of diffusion transition zone were analyzed using the metallurgical microscope, scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffractometer (XRD), respectively. The results show that Sn are uniformly distributed in the diffusion transition zone. The microstructure of diffusion transition zone are mainly composed of Ag3Sn phase and Cu3Sn phase. The relative diffraction intensity of Ag3Sn phase and Cu3Sn phase gradually increase with the increase of diffusion temperature. The formation process of Ag3Sn phase can be divided into three stages,including Ag3Sn particle phase disperse distribution, Ag3Sn particle phase merging and Ag3Sn bulk compound phase generation. Because the coating oxidation is broke out through tin whisker growth and synergistic action is formed between tensile stress and compressive stress, Cu3Snp phase will be appeared at the diffusion transition zone. The formation mechanism of diffusion transition zone can be summarized as brazing, mutual diffusion, metastability, alloying.
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Published: 25 April 2017
Online: 2018-05-02
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2017, Vol. 31 
