Powdered Ferrite???

R

Radio Man

Guest
Where in the U.S. can i purchase powdered ferrite in
order to make very large ferrite rod antennas?
 
Radio Man wrote:
Where in the U.S. can i purchase powdered ferrite in
order to make very large ferrite rod antennas?
Click to expand...
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.

--
John Popelish
 
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"
<jpopelish@rica.net> wrote in message news:41878F08.4C751556@rica.net...
Radio Man wrote:

Where in the U.S. can i purchase powdered ferrite in
order to make very large ferrite rod antennas?

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.

--
John Popelish
Click to expand...
 
Radio Man wrote:

Where in the U.S. can i purchase powdered ferrite in
order to make very large ferrite rod antennas?
Click to expand...
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
 
On Tue, 02 Nov 2004 08:43:36 -0500, John Popelish <jpopelish@rica.net>
wrote:

Radio Man wrote:

Where in the U.S. can i purchase powdered ferrite in
order to make very large ferrite rod antennas?

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.
Click to expand...
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
 
Radio Man wrote:
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.
Click to expand...
Fine. So what is the answer?
How many thousand pounds a month?
Click to expand...
--
John Popelish
 
John Popelish <jpopelish@rica.net> wrote:

Radio Man wrote:

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
Click to expand...
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?



--
Roger J.
 
How about buying a bunch of large pot cores of the material you want and
stack them together.
Mike

"Radio Man" <puns@verizon.net> wrote in message
news:eek:qHhd.4718$RA4.455@trnddc06...
Where in the U.S. can i purchase powdered ferrite in
order to make very large ferrite rod antennas?
Click to expand...
 
"Mike Knowlton" <amdx@worldnet.att.net> wrote in message
news:njpid.63533$OD2.4697@bgtnsc05-news.ops.worldnet.att.net...
How about buying a bunch of large pot cores of the material you want and
stack them together.
Mike

"Radio Man" <puns@verizon.net> wrote in message
news:eek:qHhd.4718$RA4.455@trnddc06...
Where in the U.S. can i purchase powdered ferrite in
order to make very large ferrite rod antennas?
Click to expand...

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.
 
Bob Masta wrote:
On Tue, 02 Nov 2004 08:43:36 -0500, John Popelish <jpopelish@rica.net
wrote:

Radio Man wrote:

Where in the U.S. can i purchase powdered ferrite in
order to make very large ferrite rod antennas?

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.


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.
Click to expand...
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.

--
John Popelish
 
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