Many thanks.
Joyce Koo
Researcher
Materials Interconnect Lab
Office: (519) 888-7465 x79945
BlackBerry: (226) 220-4760
[cid:[log in to unmask]]
________________________________
From: Dennis Fritz [mailto:[log in to unmask]]
Sent: Wednesday, May 08, 2013 11:06 AM
To: [log in to unmask]; Joyce Koo
Subject: Re: [TN] immersion gold
Joyce,
Immersion plating reactions are driven by replacing a metal already on the surfuce with a metal in solution.
Metal dissolved Metal plated Process
elecroless nickel gold ENIG
electroless palladium gold ENEPIG
copper electroplate silver Immersion silver
copper electropate tin Immersion tin
Immersion reactions inherently stop when the plated metal covers the surface of the metal being dissolved. That means that immersion reactions cannot reach the thicknesses you ask
That said, electroless reactions occur chemically where the metals plate on themselves and build thickness with time. Elecroless copper, nickel, silver and gold are all known and can build thicknesses that you ask. However, electroless reactions tend to have pretty pure metals (except electroless nickel that co-deposits phosphorus at some 4-12%). Someone else that supplies electroless gold will have to comment about the "hardness" of that deposit.
Electroplating can deposit essentially all the common metals and can co-deposit hardners (other metals) with gold with various properties and thicknesses.
Denny Fritz
-----Original Message-----
From: Joyce Koo <[log in to unmask]>
To: TechNet <[log in to unmask]>
Sent: Wed, May 8, 2013 10:22 am
Subject: [TN] immersion gold
Joyce Koo
Researcher
Materials Interconnect Lab
Office: (519) 888-7465 79945
BlackBerry: (226) 220-4760
Gurus,
Is there any great immersion gold process out there that can do 0.5 micron gold
with durability and good hardness? (> 20 micro-inches). I need to up date my
knowledge... -being far from plating tank for too long. Many thanks.
Best regards,
Joyce
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