Effects of Ga and Ce on the Microstructure and Properties of Cadmium-free Silver Filler Metals

doi:10.12442/j.issn.1002-185X.20170619

Home > Archive>Volume 48, Issue 1, 2019 >91-96. DOI:10.12442/j.issn.1002-185X.20170619

Effects of Ga and Ce on the Microstructure and Properties of Cadmium-free Silver Filler Metals
DOI:
                        10.12442/j.issn.1002-185X.20170619
                    
Author:
                        Ma Chaoli1Ma Chaoli
College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing
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XueSongbai1XueSongbai
College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing
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Wang Bo1Wang Bo
College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing
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Long Weimin2Long Weimin
Zhengzhou Research Institute of Mechanical Engineering
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Zhong Sujuan2Zhong Sujuan
Zhengzhou Research Institute of Mechanical Engineering
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Affiliation:1.College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing;2.Zhengzhou Research Institute of Mechanical Engineering
Clc Number:TG425.2
Fund Project:National Natural Science Foundation of China； Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD), P.R. China.

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Abstract:

Effects of Ga and Ce additions on the microstructures and mechanical properties of Ag17CuZnSn-xGa-yCe filler metals and brazed joint were investigated by microscopy method and tensile test. The results indicated that the solidus and liquidus temperatures of filler metals decreased with addition of Ga and Ce. And the wettability of filler metals on the brass and stainless steel improved when the content of Ga and Ce are 2 wt. % and 0.15 wt.%. The highest shear strength of brazed joint was 3% higher than the shear strength of the Ag17CuZnSn-2Ga. During brazing process, Ga has a higher diffusion coefficient into stainless steel than that of other elements. A novel Ce₂₀(Ag, Cu)₄₀Sn₄₀ intermetallic phase was found in filler metal when the content of Ce is higher than 0.3 wt.%.

Key words:low-silver brazing filler metal, microstructure, rare earth element, shear strength

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[Ma Chaoli, XueSongbai, Wang Bo, Long Weimin, Zhong Sujuan. Effects of Ga and Ce on the Microstructure and Properties of Cadmium-free Silver Filler Metals[J]. Rare Metal Materials and Engineering,2019,48(1):91~96.]
DOI：10.12442/j. issn.1002-185X.20170619

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Received:July 16,2017
Revised:September 13,2017
Adopted:October 12,2017
Online: February 18,2019
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