将3种银粉，即：片状银粉、片状银粉加入5%纳米银粉的混合粉、片状银粉加入10%纳米银粉的混合粉，加入双酚F环氧树脂中配制导电胶。通过在玻璃基片上印刷导电胶条，固化后测量其长、宽、厚和电阻，利用公式ρ=Rs/l计算体积电阻率。结果表明，当纳米银粉添加量为5%时，体积电阻率出现明显下降，混合银粉含量为75%时的体积电阻率能达到1.6×10-4?·cm。在接近“穿流阈值”时，加入纳米银粉可以增大颗粒间的接触面积，形成更多的导电通路，能降低导电胶的体积电阻率。
Conductive adhesives were made by adding micro-sized silver flakes, mixed-sized silver powders with the addition of 5% nano-sized silver and mixed-sized silver powders with the addition of 10% to the bisphenol F epoxy resin. By printing the conductive tap on glass substrate and caring, the length, width, thickness and resistance were measured. Then the volume resistivity could be calculated by the formula ρ=Rs/l. The results indicated that the addition of nano-sized silver powders to silver flakes usually increases its resistivity, only near the percolation threshold, the addition of nano-sized silver powders decreases the resistivity by helping to form the conductive path. When the increment of nano-silver powders was 5%, the volume resistivity decreased most significantly, the volume resistivity can reach 1.6×10-4?·cm with the content of 75%.
参考文献
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