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

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