Abstract

The effect of high electric current density on the sintering of Ag wires manufactured by screen printing is evaluated through electrical resistivity analysis and microstructure observation. Different forms (continuous and pulsed) of electric current with different current densities are applied to the specimens. Conventional heat treatment is also performed as a control group to examine the athermal effect of electropulsing treatment. Compared to the conventional heat treatment, the resistivity is reduced more under the electropulsing treatment with continuous current for the same temperature and treatment time. Also, the process time of electropulsing treatment can be reduced by applying a pulse form of high density current instead of continuous current without losing the benefit of enhanced reduction of resistivity. The microstructural observations obtained from high angle annular dark field scanning transmission electron microscope and a digital precession instrument clearly show that necking connecting the crystals is formed more firmly under electric current. In addition, the temperature change of Ag wire and substrate is calculated according to the change of the resistivity when the electric current is applied to confirm the reliability.

Graphic Abstract

中文翻译：

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电脉冲处理提高丝网印刷银线的导电性

摘要

通过电阻率分析和微观结构观察，评估了高电流密度对丝网印刷制造的银线烧结的影响。将具有不同电流密度的不同形式的电流（连续形式和脉冲形式）施加到样品上。还进行常规热处理作为对照组，以检查电脉冲处理的无热效应。与常规热处理相比，在相同温度和处理时间下用连续电流进行电脉冲处理时，电阻率会进一步降低。另外，通过施加高密度电流而不是连续电流的脉冲形式可以减少电脉冲处理的处理时间，而不会失去增强的电阻率降低的好处。从大角度环形暗场扫描透射电子显微镜和数字旋进仪获得的显微组织观察清楚地表明，在电流下，连接晶体的颈缩形成得更牢固。另外，在施加电流以确认可靠性时，根据电阻率的变化计算Ag线和基板的温度变化。

图形摘要