On Mon, 14 Apr 2014 01:33:47 +0000, you wrote:
>Hi,
>
>Does anyone know what happens to conductive inks and epoxy if the board goes through a reflow oven, or if someone tries soldering to the feedthrough?
I suspect that epoxy will decompose, burn is likely the right answer,
depending on the temperature.
I also suspect that a conductive ink is conductive particles in a
binder, and when that binder is heated, it will decompose, that may
cause the ink to fail.
In commercial applications, the conductive "ink" coats the inside of
the hole, connecting the layers just enough to render them conductive.
Plating over that connects the layers. If the original coating
deteriorates, I suspect it makes no difference at that point
The burned epoxy may prevent the solder from wetting the copper,
resulting in a bad joint
Not tried it, though.
Harvey
>
>Cheers,
>Mark
>
>-----Original Message-----
>From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com] On Behalf Of Cecil Bayona
>Sent: Saturday, 12 April 2014 11:50 AM
>To: Homebrew_PCBs@yahoogroups.com
>Subject: [Homebrew_PCBs] Plating PCB thru holes
>
>This subject has been discussed before but I'm wondering if anyone
>has tried this method before. I looks pretty simple to do and uses
>readily available material. I would imagine that to make even more
>reliable after this process is complete, you tin the board adding
>extra metal in the holes.
>
>I was thinking of doing something similar with silver ink, but the
>material to repair auto glass heaters might be cheaper
>
>< http://www.pcbfx.com/main_site/pages/tech_support/plated_thru_holes.html >
>
>There is a lot of useful information on that web site, but it takes
>effort as some of the information is hard to find.