Influence of Soldering Temperature and Dwelling Time on Morphological Evolution of Cu6Sn5 Intermetallic Compound at the Sn-3.0Ag-0.5Cu/Cu Interface
The morphological evolution of Cu6Sn5 grains formed at the interfaces of “Sn-3.0Ag-0.5Cu/Poly-crystal Cu (PC-Cu) and “Sn-3.0Ag-0.5Cu/Single crystal Cu (SC-Cu) under different reflow conditions was investigated.Reflow experiments were performed at different peak temperatures of 230,260 and 290oC corresponding to the dwelling time of 20s,60s and 600s,respectively.The results show that Cu6Sn5 grains formed at the interface of Sn-3.0Ag-0.5Cu/PC-Cu show two kinds of morphologies.The round scallop-type Cu6Sn5 grains present under reflow conditions of 230oC/20s- 10min,260oC/20s and 290oC/20s,while the faceted ones appear at 260oC/60s,260oC/600s,290oC/60s and 290oC/600s.The morphology transition of Cu6Sn5 was interpreted by the Jackson’s parameter,which is smaller than 2 for a rough surface while being larger than 2 for faceted grains.In the meantime,long prismatic grains,namely the whiskers,can be found on the existing interfacial grains after 60s dwelling time,which generate during the subsequent solidification process.At the Sn-3.0Ag-0.5Cu/SC-Cu interface,prismatic Cu6Sn5 grains appear and then grow in three directions with an angle of 60°.Also,the Cu6Sn5 whiskers can be found under a reflow condition of 290oC/20s,along the longest axis of the existing prism-type grains.
Guang-Sui Xu Jing-Bo Zeng Min-Bo Zhou Shan-Shan Cao Xiao Ma Xin-Ping Zhang
School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China
国际会议
桂林
英文
289-293
2012-08-13（万方平台首次上网日期，不代表论文的发表时间）