Noone with ideas?
I've asked specialists at Binghamton too.
Phil? Ruby? --. ..- -. - . .-. ..--..
Ingemar
-----Original Message-----
From: Ingemar Hernefjord (KC/EMW)
Sent: den 5 april 2005 18:09
To: 'TechNet E-Mail Forum'; [log in to unmask]
Subject: RE: [TN] Mousebites...
Hi Steve,
alert experts already online. I have two pictures on Nickel plated AlSiC, chemistry and who did
it can I not shout out just now, except that it's perfecly free from P, very very 100% Ni. It's greyish,
dull and matte, and very good for 60Sn soldering, at least speaking wetting. Now, we suspect something
happens after soldering the glass RF glass beads for SMA. Hermeticity becomes leakers, not gross, but
enough for rejection. I suspect some kind of fragile interface layers, cross sections indicate that, but
suspected region is much less than micron thick and hard to study.
When you look at the pics on Steve's mousetrap gallery, what do you think about the very tiny superficial
items, grains or nanonuggets or columns or how they can be caracterised as...do you think they are pure nickel
too? Are they atomary bound to the bulk plating or vagabonds that don't take part in the serious solder-nickel
wedding party? If you bite on a gold dollar you'll have to go through a thin layer of human debris and stuff from
the underwares first...best I could compare with. Can there be such a 'debris' layer on top of nickel
plating too, and if so, how do I get rid of it?
The pics are 10k resp 20k magnification.
Crazy q, not optimistic about answer..
Ingemar Hernefjord
Ericsson Microwave Systems
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]
Sent: den 5 april 2005 15:45
To: [log in to unmask]
Subject: [TN] Mousebites...
Mornin' all ya'll!
Came back in this morning and looked at the fabs that I posted about
yesterday some more. We're going to reject them.
Not just because of the mousebites on the annular pads, but we've
discovered that there are mousebites all over everything. In some
cases reducing the trace widths.
Take a look at; "Mousebites 1-4" at: http://www.stevezeva.homestead.com
If it were just the annular pads, we might have accepted them. But not with
them occuring all over the fab like this.
Kind regards,
-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX
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