NDLI: Interfacial reactions and mechanism properties between SAC 405 and SACNG lead-free solders with Au/Ni(P)/Cu substrates reflowed by CO2 laser

Content Provider	IEEE Xplore Digital Library
Author	Shao-cheng Lo Yu-Ping Hsieh Yee-wen Yen
Copyright Year	2009
Description	Author affiliation: Graduate Institute of Materials Science and Technology, National Taiwan University of Science and Technology, Taipei, Taiwan, ROC (Shao-cheng Lo; Yu-Ping Hsieh; Yee-wen Yen)
Abstract	This study investigate the interfacial reactions and mechanical property between Sn-4.0Ag-0.5Cu (SAC, in wt%) and Sn-4.0Ag-0.5Cu-0.05Ni-0.01Ge (SACNG, in wt%) lead free solders with Au/Ni(P)/Cu substrate by CO2 laser reflow. These results compare with the same systems under a conventional hot-air reflowing method in the oven. After reflowing, all samples were then taken heat-treatment at 150°C for 1000 hours. Under CO2 laser reflowing, mixtures of the (Cu,Ni)6Sn5 and (Ni,Cu)3Sn4 phases and (Ni,P,Cu) solid solution were formed at the interface. After taking a long period of heat-treatment, the (Cu,Ni)6Sn5+(Ni,Cu)3Sn4 were still observed at the interface. But, the Ni(P)+Cu solid solution disappeared as increasing reaction times. The experimental results compared with the same couples by conventional hot-air reflowing at 240°C, three layer structures, (Cu,Ni)6Sn5, (Ni,Cu)3Sn4 and Ni3P phases, were formed at the interface. The spalling intermetallic compounds could be observed in the SACNG/Au/Ni/Cu couple. The mechanical strength of solder joints by the laser reflowing technique is very similar to that by the hot-air reflowing method.
Starting Page	224
Ending Page	226
File Size	1492298
Page Count	3
File Format	PDF
ISBN	9781424443413
DOI	10.1109/IMPACT.2009.5382136
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-10-21
Publisher Place	Taiwan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gold Environmentally friendly manufacturing techniques Sn-4.0Ag-0.5Cu-0.05Ni-0.01Ge hot-air reflowing Lead CO2 laser Mechanical factors Sn-4.0Ag-0.5Cu
Content Type	Text
Resource Type	Article

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