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Effect of a Trace of Bi and Ni on the Microstructure and wetting Properties of Sn-Zn-Cu Lead-Free Solder

Journal of Materials Science & Technology 2007年第1期23卷 81-84页

作者： Haitao MA Haiping XIE Lai WANG State Key Laboratory of Materials Modification by Laser Ion and Electron Beams Dalian University of Technology Dalian 116024 China School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China

The microstructure and melting behavior of Sn-9Zn-2Cu （SZC） lead-free solder with 3 wt pct Bi and various amount of Ni additions were studied. The wetting properties and the interracial reaction of Sn-Zn-Cu with Cu substrate were also examined. The results indicated that the addition of 3 wt pct Bi could decrease the melting point of the solder and Ni would refine the microstructure and the rod-shape Cu5Zn8 phase changed into square-shape （Cu, Ni）5Zn8 phase. The addition of Bi, Ni greatly improved the wettability of SZC solder. In addition, the interracial phase of the solders/Cu joint was typical planar Cu5Zn8 in SZC-3Bi-INi alloy.

关键词： Lead-free solder Microstructure wetting property Interfacial reaction Intermetallic compounds

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Superhydrophobic Surfaces Produced by Applying a Self- Assembled Monolayer to Silicon Micro/Nano-Textured Surfaces

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Nano Research 2009年第2期2卷 143-150页

作者： Yong Song Rahul Premachandran Nair Min Zou Yongqiang Wang Department of Mechanical Engineering University of ArkansasFayettevilleAR 72701USA Ocean NanoTech LLC.2143 Worth LaneSpringdaleAR 72764USA

A novel way of producing superhydrophobic surfaces by applying a self-assembled monolayer(SAM)to silicon micro/nano-textured surfaces is presented in this *** micro/nano-textured surfaces on silicon substrates were generated by the aluminum-induced crystallization(AIC)of amorphous silicon(a-Si)***(OTS)SAMs were then applied to the textured surfaces by dip *** topography and wetting properties of the resulting surfaces were characterized using scanning electron microscopy(SEM)and a video-based contact angle measurement *** results show that by introducing OTS SAMs on the silicon micro/nano-textured surfaces,superhydrophobic surfaces with water contact angles(WCAs)of 155°were obtained,as compared to the WCAs of OTS-modified smooth silicon surfaces of about 112°.Surface topography was found to directly influence the WCA as predicted by the Cassie-Baxter model.

关键词： Superhydrophobic wetting property micro/nano-textured surfaces octadecyltrichlorosilane self-assembled monolayer aluminum-induced crystallization of amorphous silicon

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