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Powdered Ferrite???

Discussion in 'Electronic Basics' started by Radio Man, Nov 2, 2004.

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  1. Radio Man

    Radio Man Guest

    Where in the U.S. can i purchase powdered ferrite in
    order to make very large ferrite rod antennas?
     
  2. Are you talking about production quantities or just a few?
    How many thousand pounds a month?
    The stuff isn't very hard to make from the raw oxides with a kiln.
     
  3. Radio Man

    Radio Man Guest

    What i want to do is fill the inside of various lengths of pvc pipe with
    a mixture of powdered ferrite & epoxy glue. The company "Stormwise"
    sells the above already made but the items are expensive. John Popelish"
     
  4. I don't know offhand if you can even buy it retail due to
    the health issues involved in working with certain ferrites.

    Do you care about its specific B/H properties? Why not
    just salvage a shitload of ferrite cores from say "dead" AM
    radios and grind them up yourself? A small ball mill is
    about as hard to put together as a small cement mixer. In
    fact, you can use a cement mixer and a bunch of ball
    bearings (you do have to bust up the cores a bit first).

    Mark L. Fergerson
     
  5. Bob Masta

    Bob Masta Guest

    John, any pointers or links on how to do this? (I have
    a small kiln.) Is there some ceramic binder involved,
    or is the oxide sintered directly? I assume this requires
    a black magnetic iron oxide, not the red stuff?

    Just curious, no immediate needs.

    Thanks!


    Bob Masta
    dqatechATdaqartaDOTcom

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
     
  6. Fine. So what is the answer?
     
  7. I would have to dig into my records for the exact recipe, but I
    remember making nickel zinc ferrite by ball milling red iron oxide,
    green nickel oxide and white zinc oxide, together, and firing the
    powder in a pottery kiln in ceramic crucibles. The sintered powder
    was black and a lot coarser than the starting powder and had measured
    magnetic properties very similar to commercial nickel zinc ferrite.
    After a second ball milling and screening I used it in an epoxy matrix
    as a non contact temperature sensor (utilizing the curie temperature
    of the material and an inductive pickup).

    I still have some of it.
     
  8. Is there really a need for epoxy glue here?
    Shouldn't it work just as well if those pvc pipes are packed full with a
    powder of ferrite material?
     
  9. How about buying a bunch of large pot cores of the material you want and
    stack them together.
    Mike
     
  10. Clarence

    Clarence Guest


    I thought of that, but he seems bent on grinding them up, or rolling his own.

    BTW, TV deflection yokes have large chunks of Ferrite. If your operating at
    low enough frequencies.
     
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