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Electrical and Mechanical Properties of Carbon Nanotube Filled Adhesives on Lead Free PCB Surface Finishes

机译:碳纳米管填充胶在无铅PCB表面处理上的电气和机械性能

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摘要

Electrically conductive adhesives are attractive alternatives to solder and die attach materials in electronic assemblies particularly in the lead free era. Compared to metal filled conductive adhesives, multiwall carbon nanotube (MWCNT) filled adhesives are lightweight, corrosion resistant, high strength and resistant to metal migration. Previous studies of MWCNT filled epoxies on bare copper printed circuit boards identified contact resistance as a challenge for surface mount component attachment. The adhesive formulations under investigation are mixtures of epoxy Epon resin 862, Heloxy modifier 68, anhydride curing agent, catalyst and MWCNT. Loadings ranging from 2 to 14 wt% are tested to determine electrical and mechanical properties. Here we present contact resistance, volume resistivity and lap shear testing of MWCNT filled epoxy on printed circuit boards with various surface finishes on the copper pads. The surface finishes selected are immersion tin, immersion silver and electroless nickel immersion gold (ENIG).
机译:导电胶是电子组件中焊料和管芯附着材料的有吸引力的替代品,特别是在无铅时代。与金属填充的导电粘合剂相比,多壁碳纳米管(MWCNT)填充的粘合剂重量轻,耐腐蚀,强度高且耐金属迁移。先前在裸铜印刷电路板上的MWCNT填充环氧树脂研究表明,接触电阻是表面贴装元件连接的挑战。研究中的胶粘剂配方是环氧Epon树脂862,Heloxy改性剂68,酸酐固化剂,催化剂和MWCNT的混合物。测试2至14 wt%的负载量以确定电气和机械性能。在这里,我们介绍了在印刷电路板上用MWCNT填充的环氧树脂的接触电阻,体积电阻率和搭接剪切测试,并在铜焊盘上进行了各种表面处理。选择的表面光洁度为浸锡,浸银和化学镀镍浸金(ENIG)。

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