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Trouble bonding to electroless nickel plated aluminum

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tamon499

Mechanical
Joined
Aug 11, 2009
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US
I am experiencing an adhesive failure using a silver filled epoxy. The bond has an adhesive failure at the nickel plated surface. The aluminum part is plated with a med phosphourous nickel. The same epoxy bonded to stainless steel has twice the bond strength and cohesive failure. any suggestions?
 
In hybrid chip & wire assembly we used a plasma cleaner immediately prior to die bond with a silver-loaded epoxy. Substrate was either Pd-Ag, gold, or a low-temperature glass, and the plasma cleaning was to remove any organics on the surface which could weaken the bond.


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Surface contamination is the root of most bonding problems as you probably know. I would get a SEM and a scan for surface elements. I would also try Boron Nickel. That sometimes bonds better.
 
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