Journal
MATERIALS LETTERS
Volume 234, Issue -, Pages 92-95Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2018.09.005
Keywords
Ultrasonic; Welding; Interfaces; Precursor film; Wetting kinetics
Funding
- National Natural Science Foundation of China [51435004]
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The wetting phenomenon of Sn-37Pb alloy solder spreading on Cu substrate under different ultrasonic fields was investigated. Sn-37Pb/Cu wetting systems showed significant precursor film characteristics with the assist of ultrasonic energy. A short-time ultrasonic field evidently enhanced the wettability of Sn-37Pb/Cu compare to a common wetting field which had no introduced ultrasonic. At the temperature of 213 degrees C, spreading area of a Sn-37Pb solder drop in a 20 kHz, 1000 W ultrasonic field reached maximum at 2 s, and showed significant precursor film characteristics. Atomistic dynamic models showed the relevance between wettability and precursor film formation. The observed dynamic results agreed with the experimental results. (C) 2018 Elsevier B.V. All rights reserved.
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