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February 1998

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Subject:
From:
"John Haman Jr." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 20 Feb 1998 08:36:53 PST
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Scott,

You should be able to fing information on Atotech on the PC Fab
web site at www.pcfab.com/pcb.htm.  The reducer in oxide changes
the copper oxide from cupric to cuprous.  The change in the oxidation
state reduces the chance of pink ring by making the oxide less susceptilbe
to attack by acids.

I have not worked with Atotech's oxide before however the reducer for black
will work as above and a reducer like  Mac Dermids oxide will change the
black oxide to brown by cutting back the black to producer a thinner oxide
that is brown.  The brown oxide has crystal structure that is not as long
in length
and each crystal structure has been further roughened to produce a superior
surface
for bonding.  Further high Tg material such as polyimide is extremely hard.
 When
pressed with Black oxide the long crystal structures fracture, weakening
bond strength.
Also standard black oxide ( no reducer)  with its cupric oxide structure
does not hold
up well to high temperature pressing in the 425 'F range.

John Haman Jr.
Process / Product Engineer
American Board Companies, Inc


----------
>
> I am looking to get any information that anyone out there may have on
> Atotech's oxide chemistry. To be frank I didn't even know they ofered
oxide.
> Does anyone have any experience with it or has tried it. Also they have a
> enhancer after their DMAB reducer. Does anyone know what this is or it's
> function?
>
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