Electronics > Beginners
Potting an electrolytic capacitor will make it last longer?
Kjelt:
And HV testing
https://youtu.be/JenQYBuqJWk
ocset:
Thanks, i was at a radar company once...and they said they had problems with a certain potting compound, where it would put pressure on components as it cured, and damage them.
I hope to avoid PSUs with that potting compound inside them.
Gyro:
According to nctnico in the following thread, Epoxy compound shrinks during curing, PU doesn't... https://www.eevblog.com/forum/projects/temperature-probe-failure-analysis/msg277766/#msg277766
coppercone2:
there will exist some kind of internal strain in the solid potted assembly that is not present in the nonpotted with any kind of surface contact. You can't compare free air to any kind of solid enclosure. Different geometries will be effected differently. The more gummy it is the more frictional losses of mechanical there will be to mechanical strain by temperature change. It's basically creating a bimetalic strip everyone is familiar of to a lesser degree.
I do wonder if there are any tricks, like putting a buncha straws to draw potting compound away (creating voids) from non populated PCB areas or something, so they can deform. It's too complicated for me to imagine.
I don't like the idea of potting myself. It seems like a brute force solution to a delicate problem.
xani:
--- Quote from: coppercone2 on September 08, 2018, 06:21:04 pm ---I do wonder if there are any tricks, like putting a buncha straws to draw potting compound away (creating voids) from non populated PCB areas or something, so they can deform. It's too complicated for me to imagine.
--- End quote ---
Mix a styrofoam granules with potting compound ? Would also make whole thing lighter and use less potting compound. And probably a lot worse for heat conduction
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