[ARC5] Molybdenum

[Bill Fuqua]

Princeton Applied Research used Moly lube grease in some of rotary switches 
in their HR-8 lock-in amplifiers.
After some years it solidified and froze up the shafts. The switches had to 
be removed and disassembled
and shafts pressed out of the bushings. Sanded down, lubricated with 
Silicone grease and reassembled.
   I still have some HR-8 with preamplifiers in  storage that need this 
treatment before they can be used again.
What makes graphite work as  a dry lubricant is that graphite crystals are 
2 dimensional crystals and they
slide over one another with out sticking together. Graphite's carbon atoms 
are very strongly bound together
so much that it will withstand very high temperatures in air with out 
oxidizing.

73
Bill wa4lav


At 12:43 PM 1/21/2013 -0800, J. Forster wrote:
>I think it's Moly Disulphide
>
>-John
>
>=======
>
> > Oh, I have seen Molybdenum in a powder form for use as a lubricant.  It is
> > commonly used on aircraft pneumatic valves that cannot handle liquid
> > lubricants.  Of course, it comes in other forms as well for use as a
> > lubricant, but it's also produced as a gray  powder you rub on sliding
> > parts.
> >
> > Wayne
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