epoxy in vacuum

[Jamie]

I worked on the development of an HV oil filtration device. It used our
20 kV supply, and our plate arrangement and our tank chamber and oil
pump. We PULLED the oil through the chamber and filter media as this
reduced the pressure in the chamber and that was enough to keep arcing
events from happening. Operated with the lid off, it would arc
immediately. With the lid on, the pressure would pull down almost
immediately as the oil's viscosity took some work to pull it through the
piping. That reduced chamber pressure kept it from arcing.

Your curve is for pressures well below that.

In normal air, the voltage required to establish an arc rises as
pressure drops. This is NOT data related to a vacuum. It is for reduced
pressure environments.

The curve plot refers to vacuums and very low pressures.

20kvolts? that's it?

Jamie

 

[WoolyBully]

Other wise know as plasma.

Wrong.

 

[Jamie]

Wrong.

really? Guess you don't know much then.

Jamie

 

[WoolyBully]

really? Guess you don't know much then.

Jamie

The electron stream would be a plasma, idiot. The initial arc, which
is what is referred to here is NOT. The metallic vapor is from the
stream's impact, not part of the stream itself. **** off, dork.

 

[tm]

Hi,

I am making some DIY vacuum electrical feedthroughs into an aluminum
cylinder wall. I was thinking of just drilling a hole and epoxying in
a short length of copper plumbing tube, that has a copper wire epoxied
in it. Would this work ok for vacuum sealing and also for not too much
vacuum outgassing from the cured epoxy? Also how thick of epoxy is
required for 50kV standoff voltage!?

cheers,
Jamie

I believe Dow Liquid Epoxy compound was used for 50kV into a vacuume
system to make a 'custom' feedthru into e-8 to e-9 vacuum:
800 441 4369
517 832 1426
cig .AT. dow .DOT. com
I do remember using polyimide PCB's with no problem and someoneonce
'tried' to use polyamide material causing great problem.

_______________________________________

Use a spark plug?