关键词: 金锡, 铜-钼-铜, 铜-钼铜-铜, 铜-钨铜-铜

Abstract: Through the brazing failure ofcopper composite power package,we found some shortcomings in the process of domestic heat sink,such as sandpaper grinding,alumina blasting and so on,which leads to the reliability hidden trouble of the package.It also directly causes the surface roughness of the package heat sink(the surface roughness of the normal heat sink is～1.6 μm,and the failure heat sink is～2.6 μm),which is quite different from the surface roughness of the inlet heat sink(～0.55 μm).The surface roughness of the heat sink can be improved to ～0.7 μm if the domestic heat sink processing is required.The consistency and reliability of the package willbe greatly improved.

Key words: power package, AuSn, CMC, CPC, Cu-WCu-Cu