Pb-Free solders: Part 1. Wettability testing of Sn?Ag?Cu alloys with Bi additions |
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Authors: | Z Moser W G?sior K Bukat J Pstru? R Kisiel J Sitek K Ishida I Ohnuma |
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Affiliation: | (1) Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Street, 30-059 Kraków, Poland;(2) Tele and Radio Research Institute, Ratuszowa Str. 11, 03-450 Warszawa, Poland;(3) Institute of Microelectronics and Optoelectronics, Warsaw University of Technology, Koszykowa Str. 75, 00-662 Warszawa, Poland;(4) Department of Materials Science, Graduate School of Engineering, Tohoku University, Aobayama 02, 980-8579 Sendai, Japan |
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Abstract: | Maximum bubble pressure, dilatometric, and meniscographic methods were used in the investigations of the surface tension,
density, wetting time, wetting force, contact angle, and interfacial tension of liquid alloys of Sn−Ag−Cu eutectic composition
with various additions of Bi. Density and surface tension measurements were conducted in the temperature range 250–900 °C.
Surface tensions at 250 °C measured under a protective atmosphere of Ar−H2 were combined with data from meniscographic studies done under air or with a protective flux. The meniscographic data with
a nonwetted teflon substrate provided data on interfacial tension (solder-flux), surface tension in air, and meniscographic
data with a Cu substrate allowed determinations of wetting time, wetting force, and calculation of contact angle. The calculated
wetting angles from meniscographic studies for binary Sn−Ag eutectic and two ternary Sn−Ag−Cu alloys were verified by separate
measurements by the sessile drop method under a protective atmosphere with a Cu substrate. Additions of Bi to both ternary
alloys improve the wettability and move the parameters somewhat closer to those of traditional Sn−Pb solders. |
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Keywords: | density meniscographic studies Pb-free solders surface tension |
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