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密脚IC QFN专用锡膏厂家 技术稳定爬锡高度强

密脚IC QFN专用锡膏厂家 技术稳定爬锡高度强

  • 详情说明

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BUTONGGONGJINGJINGHEDEXINGCHENG

焊料是由两种或者更多金属混合而成的合金组成。它的熔化和凝固,取决于在焊料不同共晶可能凝固的区域。在焊料中含有铜和银时就会出现这种情形。在这种情况下,CuSn-和AgSn-二元共晶部分或者初晶晶粒,可能都会在焊点焊料凝固时再次形成SnAgCu三元共晶。

密脚IC QFN专用锡膏厂家 在SAC合金里可能形成不同的共晶是:Sn5Cu6(在227℃)、SnAg3(在221℃)和Sn+SnAg3+Sn5Cu6(在217℃)。然而,如果整个工艺都不使用含铅元素,就是这样。但是,对于富锡合金,锡晶体可能会在焊点冷却到232℃时凝结在合金层的外面。如果元件引脚镀了锡铅合金,从锡铅镀层中熔解出来的铅也会形成共晶晶粒。对于锡铅共晶体,焊点中焊料某些部分的熔点会降低到183℃;对于SnPbAg共晶体,焊点中焊料某些部分的熔点会降低到178℃。
凝固时焊料的收缩

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当焊料还未完全凝固时,待焊元件或者焊料发生抖动,最坏的情况是焊点产生裂纹,最好的情况是焊点失去光泽。在焊点形成时焊盘的自然移动,也会引起这个现象。在元件有很多引脚(如连接器)的情况下,焊盘的移动相当大,有可能会导致焊钖撕裂、焊锡浮起或者焊盘的撕裂。

通孔铜镀层与环氧基材料的热膨胀系数(CTE)不同,会引起焊盘变化。于是在接触到焊锡波时,焊盘会上升,沿着铜桶的边沿上呈楔形,在液态焊料流进孔中形成焊点的过程中也会出现这个现象。

只要焊点一离开焊料焊钖波,它就开始凝固。最初,在此期间较多的热量转移到环氧/玻璃布材料上,直到热能完全消失。然后,电路板冷却,并恢复到原来的状态。此时,楔形的焊盘又恢复成平面状。当这一切发生时,焊料并未完全凝固,它仍处于糊状。正是这时的抖动会在焊点凝固时影响焊点的表面,并与收缩和撕裂一起导致裂纹产生。裂纹通常与印刷电路板表面是平行的。有时裂纹呈环状。

焊点的外观

在凝固期间,最低熔点的共晶被已经凝固的微粒(熔点更高的共晶)所包围。这就是说,在焊点的最后凝固阶段,液态的熔融的焊料和已经凝固的微粒,形成了不同的纹理结构。在凝固时,焊料的体积大约收缩4%。体积的减少和收缩大多数发生在焊点最后凝固的那部分合金。在液体和固体混合凝固的不同阶段,它们各有不同的表面结构,加上体积的收缩,就形成了表面没有光泽的焊点。

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