Electronics > Projects, Designs, and Technical Stuff

silver etching PCB?

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coppercone2:

--- Quote from: magic on July 14, 2019, 07:28:24 am ---Is this for some audiophile thing? :)


--- Quote from: coppercone2 on July 14, 2019, 05:07:56 am ---so you guys think ferric nitrate etch on a bonded silver sheet to substrate with standard mask won't work?

--- End quote ---
Internet says it may work. But why bother if printing and baking works too?

--- End quote ---

its a minimum thermal and electrical impedance in given area thing

Kleinstein:
There are ways to do silver deposition relatively simple from nitrate - e.g. the way old silver mirrors where made. This would allow a DIY PCB on a glass substrate. However I don't know how good the silver will adhere - this could be a problem and deal breaker.  The conductivity of silver is not that much better than with copper, so I doubt it is worth it from this perspective.  So it may be possible to use a thin chemical silver layer as a start and than add galvanic copper on top for the main conductor.

The etching would than be mainly normal copper.  I would expect the normal copper etching solutions to also attack silver, though slower. Possibly still good enough for some 0.1 µm of silver. Alternatively also selective deposition with a negative mask on the silver could be used. So etching would be only through some 0.1 µm of silver (the tricky part here could be finding a suitable protective layer (e.g. tin, gold, NiP?) to protect the copper).

coppercone2:
you get thermal and electrical benefits

I don't see why PCB nuts can't be a thing

aluminum nitride with silver on top

I guess for best performance you would need to flame deposit silver on it or something

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