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jdat747 wrote:I found a link that may be helpful on the MCCs:
http://www.johansondielectrics.com/tech ... itors.html
especially down at the bottom of the page, there is some explanation of markings associated with these ... sorry, haven't had a chance to check to see if the markings are actually on the device, but there is a letter dedicated to the materials used which might be a tip off to PM content.
Also, it said that MCCs rated for over 500VDC usually still have Palladium.
samuel-a wrote:Nice work Adam.
Main problem with resistors is their Alumina/silicon substrate, i'm afarid, by not crushing them, you probably won't reach all of the PM's in them (Ag/Pd).
Unlike SMD capacitors that utilise Barium titanate as substrate and is slightly soluble in acids, Alumina/silicon are practically inert to mineral acids.
You should also take into account that some of resistors types contain RuO2 as the resistive layer, though i'm not so sure how will it react with the HCl, if at all.
The Ru is not worth the hassle, that's for sure. But it will be good to know if and how will it effect the process. Great caution should be taken in either cases.
It will be nice to see your progress with this project.
I haven't heard of silica/silicon being used as substrate, but even that could be dissolved in NaOH (got to be very hot
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