Influence of nodulizer type on quality of BGA solder ball

Solder ball is the key material of the bump fabrication in the BGA and μBGA high integrated package,and the nodulizer type is the main factor which affects the quality of the solder balls.The solder ball is fabricated by the fine wire cutting-remelting method when preheating temperature is 500 centidegree and spheroidization temperature is 280 centidegree,and arachis oil,silicone oil,heavy oil and engine oil are selected as nodulizers respectively.The influences of the different nodulizers on the real sphericity and the surface appearance of the 63Sn37Pb solder ball are investigated.Results show that the real sphericity value of the 63Sn37Pb solder ball is the smallest and the shape of the solder ball is more like true sphere.At the same time,the surface appearance of the solder ball is the best when the arachis oil is used as the nodulizer.The quality of solder ball is the worst when the engine oil is used as the nodulizer,and the qualities of solder balls are between them when heavy oil and silicon oil are used as the nodulizer respectively.