Investigation Of Influence Nitrogen Atmosphere On The Spreadability And Reliability Of Solder Joints

Abstract

This article examines the impact of nitrogen atmosphere on the quality of the solder joint. For tests were used two lead-free solder pastes, specifically SAC305 and SN100C. These pastes were printed on a substrate FR4 with ENIG finish with semiautomatic devices. For reflow of paste was used specially modified desiccator. This device has hot plate with the cooling system. This system is active after reflow. In this device, it was possible to create around the solder paste a nitrogen atmosphere having defined content of residual oxygen. This experiment determined the most appropriate concentration of the protective gas atmosphere to obtain the greatest wettability and spreadability of paste, which is a prerequisite for a good solder joint.