METHOD AND PROCESS OF MANUFACTURING ROBUST HIGH TEMPERATURE SOLDER JOINTS
    1.
    发明申请
    METHOD AND PROCESS OF MANUFACTURING ROBUST HIGH TEMPERATURE SOLDER JOINTS 审中-公开
    制造稳定的高温焊接接头的方法和工艺

    公开(公告)号:WO2007102062A3

    公开(公告)日:2008-01-17

    申请号:PCT/IB2007000489

    申请日:2007-03-02

    Abstract: The principles described herein relate to methods for soldering electrode terminals, pins or lead-frames of commercial electric components for high temperature reliability. In one embodiment, prior to soldering the electric components, a pre-plated solder layer is removed from the lead frame or pins, and nickel and/or gold films are formed with electroless plating. The removal of the pre-plated solder layer avoids excess pre-plated Sn with high-Pb solder that lowers the melting point to between 180°C and 220°C and weakens solder joints. The nickel layer formed with an electroless plating acts as a barrier to the interdiffusion of tin from solder with copper of the lead frame material, which may otherwise occur at high temperatures. Interdiffusion forms an intermetallic compound layer of copper and tin and degrades solder joint strength. The novel soldering processes improve high temperature reliability of solder joints and extend electronics life-time.

    Abstract translation: 本文描述的原理涉及用于焊接商业电气部件的电极端子,引脚或引线框架以实现高温可靠性的方法。 在一个实施例中,在焊接电气部件之前,从引线框或引脚去除预镀焊料层,并且用无电镀形成镍和/或金膜。 预镀焊料层的去除避免了高铅焊料的过量预镀Sn,将熔点降至180°C至220°C,并削弱焊点。 用无电电镀形成的镍层作为阻挡锡从焊料与铜框架材料的铜的相互扩散,否则可能会在高温下发生。 相互扩散形成铜和锡的金属间化合物层,并降低焊点强度。 新颖的焊接工艺提高了焊点的高温可靠性,延长了电子设备的使用寿命。

Patent Agency Ranking