STRUCTURE AND METHOD TO GAIN SUBSTANTIAL RELIABILITY IMPROVEMENTS IN LEAD-FREE BGAs ASSEMBLED WITH LEAD-BEARING SOLDERS
    18.
    发明申请

    公开(公告)号:US20070228117A1

    公开(公告)日:2007-10-04

    申请号:US11759298

    申请日:2007-06-07

    IPC分类号: B23K31/02

    摘要: Methods of forming and assemblies having hybrid interconnection grid arrays composed of a homogenous mixture of Pb-free solder joints and Pb-containing solder paste on corresponding sites of a printed board. The aligned Pb-free solder joints and Pb-containing solders are heated to a temperature above a melting point of the Pb-free solder joint for a sufficient time to allow complete melting of both the Pb-free solder joints and Pb-containing solder paste and the homogenous mixing thereof during assembly. These molten materials mix together such that the Pb from the Pb-containing solder disperses throughout substantially the entire Pb-free solder joint for complete homogenization of the molten materials to form the homogenous hybrid interconnect structures of the invention.

    摘要翻译: 具有混合互连栅格阵列的形成和组装方法,其由印刷电路板的相应位置上的无铅焊点和含Pb焊膏的均匀混合物组成。 将排列的无铅焊点和含Pb焊料加热到无铅焊点的熔点以上的温度足够的时间,以使无铅焊点和含Pb焊膏完全熔化 并在组装期间均匀混合。 这些熔融材料混合在一起,使得来自含Pb焊料的Pb分散在基本上整个无铅焊料接头处,以使熔融材料完全均化,形成本发明的均匀混合互连结构。