[time-nuts] Hydrogen Maser KIT! Update #1

Chuck Harris cfharris at erols.com
Mon Nov 3 15:46:14 EST 2014

Hi Yuri,

It would be a very good idea to keep the temperature of
the nichrome wire low, and that might be the biggest problem
with the vacuum deposition technique... the wire could get
too hot in some places, and stay too cool in others.

A really uncontrolled experiment, aka: a thermal wire stripper,
gets covered with white snow from the teflon vapor released
while stripping teflon wire.

-Chuck Harris

Yuri Ostry wrote:
> Hello,
> Monday, November 3, 2014, 5:40:30, Chuck Harris wrote:
> C> I would think that making the teflon coating would be pretty easy.
> C> What I would try is to put a nichrome boat, and some teflon into the
> C> vessel, and pull it down to a good vacuum.  Then heat up the boat,
> C> and the teflon should sublime, and condense on the walls of the
> C> vessel.
> C> The nichrome boat could be something as simple as wrapping the nichrome
> C> into a solenoid form around some teflon rod.
> C> -Chuck Harris
> Teflon decomposes at high temperatures, releasing some sublimate and a
> lot of really nasty chemicals, like fluorfosgen. There is a chance
> that really thin even coating can be produced this way, but a lot of
> experimentation would be needed.
> I would try to take samples of PTFE-insulated hookup wire (from different
> manufacturers, say white Alfa or Belden wire and russian MGTF wire that use
> slightly different PTFE formula) and try to make coating inside glass
> tube samples, using copper wire as heater by itself.
> I doubt that there will be good results, though. "Classic" way with
> thin slurry application and heating to teflon melt point to make solid
> film may be more "realistic".

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