Effects of Cu addition on growth of Au-Sn intermetallic compounds at Sn-xCu/Au interface during aging process
来源期刊：Rare Metals2007年第S1期
论文作者：TIAN Yanhong,WANG Chunqing,and LIU Wei Microjoining Laboratory,State Key Laboratory of Advanced Welding Production Technology,Harbin Institute of Technology,Harbin ,China
文章页码：331 - 337
摘 要：The growth of Au-Sn intermetallic compounds（IMCs） is a major concern to the reliability of solder joints in microelectronic,optoelectronic and micro-electronic-mechanical system（MEMS） which has a layer of Au metallization on the surface of components or leads.This paper presented the growth behavior of Au-Sn IMCs at interfaces of Au metallization and Sn-based solder joints with the addition of Cu alloying element during aging process,and growth coefficients of the Au-Sn IMCs were calculated.Results on the interfacial reaction between Sn-xCu solders and Au metallization during aging process show that three layers of Au-Sn IMCs including AuSn,AuSn2 and AuSn4 formed at the interface region.The thickness of each Au-Sn IMC layer vs square root of aging time follows linear relationship.Calculation of the IMC growth coefficients shows that the diffusion coefficients decrease with the addition Cu elements,which indicates that Cu addition suppresses the growth of Au-Sn IMCs layer.
TIAN Yanhong,WANG Chunqing,and LIU Wei Microjoining Laboratory,State Key Laboratory of Advanced Welding Production Technology,Harbin Institute of Technology,Harbin 15000,China
摘 要：The growth of Au-Sn intermetallic compounds（IMCs） is a major concern to the reliability of solder joints in microelectronic,optoelectronic and micro-electronic-mechanical system（MEMS） which has a layer of Au metallization on the surface of components or leads.This paper presented the growth behavior of Au-Sn IMCs at interfaces of Au metallization and Sn-based solder joints with the addition of Cu alloying element during aging process,and growth coefficients of the Au-Sn IMCs were calculated.Results on the interfacial reaction between Sn-xCu solders and Au metallization during aging process show that three layers of Au-Sn IMCs including AuSn,AuSn2 and AuSn4 formed at the interface region.The thickness of each Au-Sn IMC layer vs square root of aging time follows linear relationship.Calculation of the IMC growth coefficients shows that the diffusion coefficients decrease with the addition Cu elements,which indicates that Cu addition suppresses the growth of Au-Sn IMCs layer.
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