Solder alloy and solder joint

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United States of America Patent

PATENT NO 11992902
APP PUB NO 20230084073A1
SERIAL NO

17896321

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Abstract

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Provided are a solder alloy and a solder joint, which have a narrow ΔT to suppress solder bridges and solder icicles, and a small amount of dross generated in a solder tank, suppress Cu leaching, and have higher strength. The solder alloy has an alloy composition of, by mass %, Cu: more than 2.0% and less than 3.0%; Ni: 0.010% or more and less than 0.30%; and Ge: 0.0010 to 0.20% with the balance being Sn. Preferably, by mass %, Cu is more than 2.5% and less than 3.0%, and the alloy composition satisfies the following relations (1) and (2): 2.400≤Cu+Ni+Ge≤3.190 (1), and 0.33≤Ge/Ni≤1.04 (2). Cu, Ni, and Ge in the relations (1) and (2) each represent the contents (mass %) in the alloy composition.

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Patent Owner(s)

Patent OwnerAddress
SENJU METAL INDUSTRY CO LTDTOKYO 120-8555

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Yokoyama, Takahiro Tokyo, JP 72 347
Yoshikawa, Shunsaku Tokyo, JP 52 138

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