"Roy Lewallen" wrote in message
...
I stand corrected. I hadn't encountered ground down ferrite as you
describe. I should have realized it existed, though, since I've used
ferrite loaded paints and silicone rubber, which must contain ferrite in
this form. Thanks for the correction, and to the original poster I
apologize -- please disregard my posting.

Am I correct in assuming you'd end up with ferrites of lower permeability
(and higher saturation flux density) than the unpowdered original, due the
inevitable air gaps between particles?

A major manufacturer of ferrite-loaded materials such as paints and
silicone rubbers is Emerson & Cuming. They might be a possible source of
ferrite in powdered form.

Roy Lewallen, W7EL



I personally never saw ferrite any finer than a vaguely gritty powder, and
we had no need for anything finer in the technical ceramics that we were
making. But the ferrite paints are a good example that finer grinding is
common.

I think you are right about the smaller particles yielding high saturation
levels. And another possible source for ferrite in powdered form might be
Steward (in Tennessee).

Ed
wb6wsn