How many thicknesses of Intermetallic Compounds(IMC) is good?| 24 September, 2019
Well, there may be a misunderstanding that people think the IMC layer grows the thicker the more strong soldering strength. Actually, the IMC layer can be grown and distributed evenly at the interface between Cu-based, Ni-based and Sn-solder will be enough.
Once the IMC layer grows too thick and over 5um then it will become brittle and soldering strength will be reduced.