Electronics > Projects, Designs, and Technical Stuff
9kV CW multiplier potting process
(1/3) > >>
doktor pyta:
I've been asked to share some details of potting (moderately) high voltage assembly.
So below You will find some subsequent stages and related photos.
Sorry for not documenting all of the steps.
If someone have any suggestions please share.

Procedure:

1. reflow soldering of components
2. attaching wires
3. ultrasound cleaning
4. drying
5. HV testing before potting (minimize corona discharge!)
6. preparing special mould (I'm proud especially of this design from 2012)
7. covering internals of the mould with 'release agent' (seems to be more less stearine in naphta)
8. putting HV assemblies into the mould
9. mixing two-component silicone
10. degassing under vacuum (approx 30s)
11. careful potting
12. second degassing (approx 30s) to get rid of air trapped between components and PCB
13. 24h curing at room temperature under atmospheric pressure
14. HV testing after potting
doktor pyta:
p
doktor pyta:
p
doktor pyta:
p
coppercone2:
depending on the viscosity of your epoxy, you might want to mix it under vacuum. need specialized equipment. If its anything more then a light syrup, you only get the best results if you mix it under vacuum or mix it in a nozzle. If viscosity is low, there is no benefit.

If you can't do this, I recommend getting a blank epoxy cartridge with a mixing nozzle and refill it with silicone epoxy.

What is your epoxy type? I am interested. I assume its some kind of epoxy silicone.

Also, for complex things, you need to do a vacuum pour, if you pour it in and pull a vacuum, you can make situation worse. But this depends all on viscosity. This is particularly relevant for inductor/transformer winding's.
Navigation
Message Index
Next page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod