Interfacial Reaction and Die Attach Properties of Zn-Sn High-Temperature Solders |
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Authors: | Seongjun Kim Keun-Soo Kim Sun-Sik Kim Katsuaki Suganuma |
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Affiliation: | (1) Graduate School of Engineering, Osaka University, Osaka, Japan;(2) Institute of Scientific and Industrial Research, Osaka University, Osaka, Japan |
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Abstract: | Interfacial reaction and die attach properties of Zn-xSn (x = 20 wt.%, 30 wt.%, and 40 wt.%) solders on an aluminum nitride–direct bonded copper substrate were investigated. At the
interface with Si die coated with Au/TiN thin layers, the TiN layer did not react with the solder and worked as a good protective
layer. At the interface with Cu, CuZn5, and Cu5Zn8 IMC layers were formed, the thicknesses of which can be controlled by joining conditions such as peak temperature and holding
time. During multiple reflow treatments at 260°C, the die attach structure was quite stable. The shear strength of the Cu/solder/Cu
joint with Zn-Sn solder was about 30 MPa to 34 MPa, which was higher than that of Pb-5Sn solder (26 MPa). The thermal conductivity
of Zn-Sn alloys of 100 W/m K to 106 W/m K was sufficiently high and superior to those of Au-20Sn (59 W/m K) and Pb-5Sn (35 W/m K). |
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Keywords: | Zn-Sn die attachment high-temperature lead-free solder interfacial reaction stability during reflow shear strength thermal conductivity |
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