Especially the large area solder joint between DCB-substrate and Cu base-plate is known to induce a certain curvature into the base-plate immediately after cooling down from soldering.
In this article it was shown that Cu In TLP solder systems deposited with cooling periods showed an insufficient solder ability due to the Surface roughness.
Copper solder copper double cantilever beam (DCB) model specimens were prepared using SAC305 solder at cooling rates and times above liquidus typical of actual ball grid arrays (BGAs).
Solder systems deposited at low substrate temperatures set with a cooling unit showed a good solder ability.
This removal of the solder allows for the capture and visualization of the interfacial IMCs formed during soldering and avoids the influence of Cu6Sn5 precipitated from the solder matrix during cooling.
This removal of the solder allows for the capture and visualization of the interfacial IMCs formed during liquid-state soldering and avoids the influence of Cu6Sn5 precipitated from the solder matrix during cooling.
This way, when the solder cools, it forms an alloy with the surface of the metal.
After the solder has finished cooling, mount the probe to the can with the wire on the inside and the screw connector on the outside.
Keep strong breezes away from the object itself, however, or their cooling effect may make the soldering process difficult.
The results show the hysteresis and Bauschinger-like behaviors for the Cu-AlN plate during the solder-reflow heating and cooling.
