Effect of Superheat on Particle Morphology of Atomized Sn3Ag2.8Cu Alloy Powders

To accelerate the lead-free process in the electronic industry in our country,the effect of superheat condition on morphology of the Sn3Ag2.8Cu alloy lead-free solder powder particles was studied by using self-designed supersonic atomization device.The results show that the proportion of the satellite particles and special shaped particles could be controlled through adjusting the superheat condition for the alloy.Under 150 ℃ superheat condition,the proportion of the satellite particles and special shaped particles were the least,and the sphericity of the particles was optimal.And the sphericity of the particles was worse under 100 ℃ superheat condition.There were more satellite particles and flake particles in the atomized powders under 250 ℃ superheat condition.