Is it also part of their norms?
Cheers
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
Sent: Friday, August 31, 2007 5:55 AM
To: [log in to unmask]
Subject: Re: [TN] Plasma "oxidation"
Hi Dave!
In fact, that is what I wanted to hear! Ditto Bev.
If my decision is anchored in the rockwell&rim cliffs, that's enough.
Thanks both. Alea acta est...
/Inge
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
Sent: den 31 augusti 2007 14:08
To: [log in to unmask]
Subject: Re: [TN] Plasma "oxidation"
Hi Inge! Apparently, the lack of material science knowledge can go a
long way. Just because a metal oxidizes, doesn't necessarily mean it
can't play a role in electrochemical migration. And silver oxide is as
conductive as silver metal (silver is one of those metals with some
pretty wild properties). Sorry, I don't buy the "plasma oxidation"
process validity.
Dave Hillman
Rockwell Collins
[log in to unmask]
Hernefjord Ingemar <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
08/31/2007 03:52 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to Hernefjord
Ingemar <[log in to unmask]>
To
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cc
Subject
[TN] Plasma "oxidation"
Yup. Strange title. I've been asked about a strange process, which one
was introduced without my knowledge, and I'm going to throw it out. But
I thought of consulting TN before. This is the case:
LTCC substrates are silver epoxy dispensed for chip mounting. In order
to avoid risk for silver migration, a guy invented plasma "oxidation",
i.e. he use a plasma cleaner, runs Argon with 6% Oxygen for a couple of
minutes on mounted substrates. The silver epoxy dots become blackish
because of oxidation, and oxidized epoxy is meant to minimize risk for
silver migration. The oxide is of course just nanometer thick. The guy
worked at a wafer manufacturing plant and had experience of cleaning
procedures.
I mean that this process is nonsense. If humidity gets in and condense
on the substrate, and if the electric field is high enough, and if there
are salts or contaminations, there is still enough silver to start
migration. Oxidation of the silver dot's surface is meaningless. Anyone
heard of such a strange process? Plasma operation on mounted LTCC
substrates is foreign to me, I want it out.
TrikeMan?
Inge
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