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Effect of Zn Addition on the Interfacial Reactions between Cu and Lead-Free Solders

Published online by Cambridge University Press:  26 February 2011

Su-Chun Yang ,
Cheng-En Ho ,
Chien-Wei Chang  and
C. Robert Kao
Su-Chun Yang
Affiliation:
[email protected], National Central University, Department of Chemical & Materials Engineering, No.300, Jhongda Rd.,, Jhongli City, 32001, Taiwan, +886233662745
Cheng-En Ho
Affiliation:
[email protected], National Central University, Department of Chemical & Materials Engineering, No.300, Jhongda Rd.,, Jhongli City, 32001, Taiwan
Chien-Wei Chang
Affiliation:
[email protected], National Central University, Department of Chemical & Materials Engineering, No.300, Jhongda Rd.,, Jhongli City, 32001, Taiwan
C. Robert Kao
Affiliation:
[email protected], National Taiwan University, Department of Materials Science & Engineering, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan
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Abstract

Recently, it was reported that adding Zn to solder was an effective way for reducing the formation of both Cu3Sn and Cu6Sn5 and inhibiting Kirkendall voids formation. The objective of this study is to investigate this Zn effect in detail. Three Sn-xZn solders (x = 0.5, 0.7, and 2 wt. %) were reacted with Cu substrates at 250°J for 2-10 mins. A slight variation in the Zn concentration changed the reaction product formed at the interface. When the Zn concentration was low (x = 0.5 wt. %), the reaction product was Cu6Sn5. At high Zn concentration (x = 2 wt. %), the reaction product became Cu5Zn8. When Zn concentration was in-between (x = 0.7 wt. %), Cu6Sn5 and CuZn co-existed. The above findings are explained using the Cu–Sn–Zn phase diagram. The implication is that the type of compound forms at the interface can be controlled by adjusting the Zn concentration of the Sn-based solders.

Keywords

surface reactionsolderingZn
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 968: Symposium V – Advanced Electronic Packaging , 2006 , 0968-V03-03
Copyright
Copyright © Materials Research Society 2007

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References

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