"Roy Lewallen" wrote in message
...
There's no such thing as "powdered ferrite". Ferrites are ceramics, made
by firing special clays at high temperatures with proprietary processes.
The process is similar in many ways to firing pottery, and making a
ferrite rod from "powdered ferrite" would be as hopeless as making a
ceramic vase from ground-up coffe mugs.

Roy Lewallen, W7EL


After the sintering step, the resultant granules are ground down to a
reasonably uniform size. These powders (and I wouldn't know what else to
call them) can then be compressed into pellets, extruded into rods, mixed
with a vehicle and cast as thin films, or sprayed onto substrates. You can
even blend them into a binding carrier (like wax or epoxy) and create
physical shapes (like rods or blocks).

The density of the ferrite particles can be controlled, yielding
inter-particle gaps as desired.

Ferrite exists in it's granular (powdered) form. However, since there's
likely little market for this stage, you might have trouble buying a few
pounds of it.

Ed
wb6wsn