Effect of Spheroidizing Medium on Quality of Ball Grid Array Solder Ball

With 63Sn37Pb welding wire as raw material, using peanut oil, silicone oil, engine oil and castor oil as spheroidizing mediums, respectively, ball grid array (BGA) solder balls were prepared by the cutting-remelting technology at spheroidization temperature of 320℃. The effects of different spheroidizing mediums on the real sphericity, surface quality and oxygen content of the solder balls were studied. The results show that when the spheroidizing medium was peanut oil, the prepared solder balls had the highest real sphericity of 98.89% and the best surface quality, and also the oxygen mass fraction was the lowest of 0.027%. The peanut oil had the best spheroidization effect, followed by the castor oil, while the spheroidization effects of the silicone oil and the engine oil were the worst.