There are a number of heat conductive and electrically conductive
compounds available. Do a search on them. There should be some rather
inexpensive compounds. I believe Beryllium dioxide (BR2) grease should
work. It's very expensive in "grease gun cartridges", but it should be
inexpensive on small quantities. It's messy and tenacious to use. Get
it on your hands and it seems to take on a life of its own.:-D IIRC Its
designed for high pressure, low RPM contact, but works well on things
like rotary inductors.
73, Roger (K8RI)
On 7/6/2018 10:08 AM, Greg Wasik wrote:
I have a large egde wound Kintronics roller inductor and I'm using it
in a remote antenna tuner that I built.
I've been using silver conductive grease on the inductor contacts.
(roller) It is not cheap but you might find a less expensive source....
https://www.amazon.com/gp/product/B005T8QLYM/ref=od_aui_detailpages01?ie=UTF8&psc=1
Greg
K1YW
On Thu, Jul 5, 2018 at 10:15 PM, Roger (K8RI) <k8ri@rogerhalstead.com
<mailto:k8ri@rogerhalstead.com>> wrote:
Silicone dielectric greases work just fine as long as there is no
arcing. If there is an arc in the grease, the grease will break
down into its constituent components, one of which is Silicon
Dioxide. This is not a problem as long as the wiper(s) maintain a
constant contact. I've used it for years. Even used both DC4 and
DC5 in ignition systems with only one exception. After all, these
compounds were designed for and used on the ignition systems of B17s.
However, one distributor cap had a flaw and the grease leaked
through to the inside. The rotor wiper was fine, but each
connection to the spark plug wires has a tiny gap. Each gap had a
"growth" of Silicon Dioxide which eventually grew to the point
where the end of the rotor hit it, breaking off mostly small
pieces which quickly ground the insides into a mess. The same
thing would happen with an RF arc.
I haven't used a roller inductor in many years, but I used
Silicone grease with no problems when I did.
For those who aren't aware, Silicon Dioxide is Quartz. Fine Quartz
is a very tough abrasive! IIRC it was used for the Space Shuttle
windows in its crystal form which were made by decomposing HSiCl3
at high temperature. I do not know the process was implemented.
--
73, Roger (K8RI)
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