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Flux-conducting epoxy?

Discussion in 'Electronic Design' started by eromlignod, Dec 16, 2003.

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  1. eromlignod

    eromlignod Guest

    Hey kids:

    I'm looking for a cold-castable substance that will conduct electrical
    flux like a transformer core. I'm supposing that it will be some sort
    of mixture containing ferrite. Does such a thing exist?

    Thanks for all replies!

  2. Fred

    Fred Guest

    Electrical flux! - do you mean magnetic flux?

    If magnetic, what frequency are you running at?

    If LF then soft iron. If HF then ferrite of some kind. Most ferrite cores
    we see are from fired materials.
  3. John Fields

    John Fields Guest

    It seems like it should, but I couldn't find anything. There _are_
    powdered magnetic materials available though, and it seems if you could
    select something with the characteristics you wanted and find a castable
    binder you could pretty much make whatever you needed. "Magnetic metal
    powders" (with the quotes) brings up some interesting hits on google

    is a pretty good source for almost any kind of encapsulant/binder you
    might want.

    If you don't mind telling, what are you trying to do?
  4. John Fields

    John Fields Guest

  5. Try...


    .... they have much interesting stuff including castable resin based

  6. JeffM

    JeffM Guest

    maybe you could use something like "Liquid Steel"?
    It's just a trade name. It's just epoxy and contains no metal.
  7. I have made mixtures of granulated ferrite and epoxy but even mixed to
    the consistency of cookie dough that had to be packed into molds, I
    never achieved a permeability much above 10. There are just too many
    tiny gaps in series for any flux lines passing through the mixture to
    achieve anything near the permeability of a stacked lamination core.
    They work well for high frequency and energy storage inductors,
  8. It's just a trade name. It's just epoxy and contains no metal.[/QUOTE]

    It does contain metal fibers in addition to other fillers. A rare earth
    magnet will pick up hardened bits of it.

    It would make a crummy magnetic core, though.
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