The microstructure of joint of H62 brass soldered using HLSn60PbSbA solder and the influences of soldering time on microstructure and properties are studied in this paper. It is observed that the joint consists of lead base solid solution, lead-tin base eutectic, copper base solid solution, cellular and block-shaped chemical compounds. Some plate-shaped chemical compounds occurred when soldering time is up to 120s. And it is found that these plate-shaped chemical compounds can be considered to be the main reason for the decrement of mechanical properties, where the mechanical properties of the joint with the shortest holding time are the best.
Key words
tin-lead solder /
brass /
copper /
microstructure /
properties
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References
ASM handbook, Volume 3, Alloy phase diagrams, Printed in USA, Firsted Printing. December 1992.
张启运,庄鸿寿.钎焊手册.北京:机械工业出版社,1991.1.
DUNN D S,MARINIS T F,SHERRY W M,WILLIAMS C J. Dependence of Cu/Sn and Cu/60Sn40Pb solder joint strength on diffusion controlled growth of Cu3Sn and Cu5Sn6. electronic packaging materriols science, Boston, Massachusetts, USA, 227-29 NOV, 1984.
LONDON J,ASHALL. D W. Compond growth and fracture at copper/tin-silver solder interfaces. Brazing Soldering(11). 49-55 Autumn 1986.
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Footnotes
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