键合时间对粗铝丝超声引线键合强度的影响

试验研究了不同超声功率条件下,键合时间对粗铝丝引线键合强度的影响规律.试验中记录了每种键合试验的键合时间,采集了每一个键合点的剪切测试力作为键合点抗剪强度的表征,记录了每个键合点的状态.结果表明:(1)在小超声功率条件下,键合强度对键合时间敏感;在大超声功率条件下,敏感性下降;(2)短键合时间条件下主要键合失败形式为剥离和无粘接,表明键合界面的原子扩散不够;(3)大超声功率长键合时间条件下的键合失败形式多为根切,表明键合界面的原子扩散虽然足够,但长时间的超声振动也会使粗铝丝产生疲劳断裂,形成过键合.

Effect of bonding time on thick aluminum wire wedge bonding strength

The effect of bonding time on the bonding strength of thick aluminum wire wedge bonding was studied under different ultrasonic power conditions. The shear strength is the criterion of bonding strength.The experiments show that:(1) Bonding strength is sensitive to the bonding time when the ultrasonic power is low,and insensitive when the ultrasonic power is high.(2) For short bonding time,the primary failure are peeled off and non-stick,which indicated that the diffusion of interface is insufficient.(3) For long bonding time and large ultrasonic power, the failure state is break,which illuminated that the diffusion of interface is sufficient,and the durative vibration causes fatigue crack in the aluminum wire.