Hair-brained idea #432,789 Metal shavings and glue?
- Thread starter mkiijam
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user 37518
Well-known member
How dense is the metal coverage inside the epoxy? The metal parts are probably not touching, most of them at least. It might work as some sort of shield, probably not a very effective one, unless there is a whole lot of metal in it.
capacitor
Well-known member
I wonder if something like JB Weld (original formulation with iron powder) could work. This post references using graphite to increase the conductivity:
https://www.head-fi.org/threads/jb-weld-electrical-conductivity-you-can-make-it-happen.629057/
https://www.head-fi.org/threads/jb-weld-electrical-conductivity-you-can-make-it-happen.629057/
user 37518
Well-known member
It could, iron powder cores for inductors are done somehow like that.
What are you trying to shield? A Faraday shield needs to surround what you are trying to shield, so would need to be inside the cavity. I am having trouble how you could do anything practical with your circuit or device stuck in the middle of a block of conductive epoxy.
I starting thinking about that idea that you cab effectively increase the shielding factor by having layers rather than one solid piece of steel. Like the idea that 2 .125" sheets held together or slightly apart, offer better shielding than 1 piece of .250. Something to do with the fields not being able to line up or something...
Like insulating a power transformer or something.
The "cavity" idea came as I was thinking about separating two sheets of steel to gain the increase in shielding, then I was like... why don't I fill that "gap" with metal powder or filings and hold it all together with epoxy!
Like insulating a power transformer or something.
The "cavity" idea came as I was thinking about separating two sheets of steel to gain the increase in shielding, then I was like... why don't I fill that "gap" with metal powder or filings and hold it all together with epoxy!
Make some test blobs/beads and test continuity. I would expect a tough path between diminishing conductivity and poor adhesion. There is conductive epoxy, I use for RF shielding or tape head grounding, but highly toxic(voc’s passing metals into your body) and expensive.
If density were important, then pour melted lead in the void, but it all seems like belt plus suspenders plus gaff tape to keep the pants up.
If the goal is shielding, .250 is overkill, you are better off using mumetal.
Mike
If density were important, then pour melted lead in the void, but it all seems like belt plus suspenders plus gaff tape to keep the pants up.
If the goal is shielding, .250 is overkill, you are better off using mumetal.
Mike
I vaguely recall some conductive epoxy. If the metal chips are not grounded they won't do much useful.
JR
JR
user 37518
Well-known member
Chaotic means nothing, a continuous surface is better than whatever random or chaotic thing you have going on.
Better than what? Certainly not better than a continuous sheet of high conductivity metal (for electrostatic shielding) or high permittivity metal (for magnetic shielding as well).
