[Amps] RE: Lubircation of Roller Inductors

[Paul Marbourg]

Hi Rich.  Here are some comparative resistivities.  As you will see, MoS2 is
the semi-conductor range.  Values were obtained from Carmichael, R. S. ed.,
Handbook of Physical Properties of Rocks for the mineral Molybdenite.  Also,
data is found in the CRC Handbook.

Ag = 1.59 uohm-cm
Cu = 1.72 uohm-cm
Mo = 5.34 uohm-cm
MoS2 = 12 X 10^6 uohm-cm or 0.12 ohm-m

Since the value for MoS2 is for the mineral form, resistivity could be
expected to change somewhat in thin film dispersions.  No data was found for
resistivity of MoS2 thin films.

MoS2 in an oil carrier would be less conductive due to high dielectric
constant of most long-chain alkane lubricants.

73, Paul WN7T

----- Original Message ----- 
From: "rlm" <r at somis.org>
To: "Paul Marbourg" <zborg at comcast.net>; "AMPS" <amps at contesting.com>
Sent: Tuesday, September 09, 2003 6:21 AM
Subject: Re: [Amps] RE: Lubircation of Roller Inductors


>
>
> >I would like to thank all the kind people who responded to my question
> >regarding the best lubricant for sliding contacts in an old EF Johnson
> >edge-wound roller inductor.  Molybdenum disulfide is the obvious winner
> >here.
>
> ***  what is the relative conductivity of moly disulphide?
>
> >Applied as a slurry solution in a very light film application seems
> >to be the best choice.  Avoiding mineral or silicone oil carriers allows
> >for a dry-lubricating molecular film which does not attract dust.
>
> ***  which, unless confined in an enclosure, readily falls off.  A little
> 5w oil keeps the moly disulphide from falling off during adjustment.
>
> >...