Re: materials of electroddes for Neon gas tubes..

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Mercurus2000" <mercurus2000@xxxxxxx>

I would like to make a electrodeless neon tube using plastic.. That's why
I've been asking.
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, October 04, 2005 5:59 PM
Subject: Re: materials of electroddes for Neon gas tubes..


> Original poster: BunnyKiller <bunikllr@xxxxxxx>
>
> in some of the most demanding enviroments  (flashtubes for lasers,
> photography where insainly amounts of power are dissapaated in less
> than microseconds) tungsten is preferred...
>
> Scot D
>
>
>
> Tesla list wrote:
>
> >Original poster: d a <btoc3000@xxxxxxxxxxxx>
> >
> >hey,
> >
> >I thought the materials for electrodes used in any gas tubes should
> >be of low sputtering energy materials?
> >
> >what materials are best suited for the electrodes in a neon gas
> >tubes/ gas discharge tube?
> >
> >Thanks
> >sam
> >
> >Tesla list <tesla@xxxxxxxxxx> wrote:
> >Original poster: William Beaty
> >
> >On Sun, 2 Oct 2005, Tesla list wrote:
> >
> > > Original poster: "Mercurus2000"
> > >
> > > I was just wondering, to make a neon light, all you really need is to
> > > pump a chamber down to several torr and then backfill fully till it's
> > > full with neon right?
> >
> >I haven't done it myself, but I know that to make a professional neon
sign
> >that lasts for more than hours, you need a thousands-watts HV
transformer.
> >They're called "bombarders" in the industry. You can probably find info
> >about doing a home-built bombarder via one of the neon sign forum
> >archives. They're nasty expensive if bought new from a catalog.
> >
> >You use the bombarder-transformer to run the neon sign at over 10x normal
> >output power while it contains low-pressure air, while also running your
> >pu mps. This heats the glass almost red hot, which drives out the water
> >vapor and adsorbed air, and which also anneals the glass joints so they
> >don't spontaneously crack over many days.
> >
> >If you don't want to buy a bombarder, perhaps you could use a
glassmaker's
> >annealing oven to do the same thing. With such an oven you could also do
> >all kinds of vacuum tube glassblowing, rather than just making neon
signs.
> >Also, if you make Tesla coil driven neon art, I don't think a bombarder
> >will work. You'd have to outgass the weird glass shape in an annealing
> >oven while pumping it down. Or perhaps you can get away without the oven
> >if a huge "getter" can scavange up all the surface crap that slowly leaks
> >out into your low pressure environment.
> >
> >I wonder if Radio Shack used annealing ovens on "Eye of the Storm" plasma
> >displays? If those displays use 1-atmosphere argon/helium/xenon mixture,
> >then perhaps the outgassing from the glass has little effect sin ce the
> >outgas volume is tiny when compared to the gas that's in the globe. That
> >would be another possibility: use 1-atmosphere nobel gasses in a neon
> >sign, rather than other types of gasses at millitorr pressure. Argon and
> >helium are cheap! Normal electrodes might be destroyed. I don't know.
> >But you could drive it with TC type supply, and wrap external electrodes
> >around the ends of the glass tube. That's basically how "Eye of the
> >Storm" is driven: the electrode is steel wool in a chamber open to the
> >atmosphere.
> >
> >
> >(((((((((((((((((( ( ( ( ( (O) ) ) ) ) )))))))))))))))))))
> >William J. Beaty SCIENCE HOBBYIST website
> >billb at amasci com http://amasci.com
> >EE/programmer/sci-exhibits amateur science, hobby projects, sci fair
> >Seattle, WA 206-789-0775 unusual phenomena, tesla coils, weird sci
> >
> >