Formation of Ag3Sn plates in SnAgCu solder bumps
journal contributionposted on 2013-10-31, 09:11 authored by Jicheng Gong, Changqing LiuChangqing Liu, Paul ConwayPaul Conway, Vadim SilberschmidtVadim Silberschmidt
Special experiments are designed to obtain the solid reactants directly from a liquid solder during phase transformation. Series of such tests performed throughout reflow, which enables to investigate the entire formation process of intermetallic Ag3Sn plates out of liquid SnAgCu solder bumps. The results show that Ag3Sn plates are formed first in the middle of the cooling stage. In the plane, they have two preferable growth directions. By varying thermal conditions during reflow, the formation mechanism of these plates is discussed.
- Mechanical, Electrical and Manufacturing Engineering