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Dominic, Nitrile appears to be the same thing as Buna-N, which is what I use for my main chamber seals. so Yea, I'd say they will work. If it helps, the o-rings for my electrical pass troughs were

On the continuing saga of the electrode-through-chamber story... I now secured some green TIG welding rods and see that this is the material for my first aluminizing attempt. For feed-throughs I plan

Guys, My evaporator is identical (more or less) to this unit: http://www.physics.utoledo.edu/~dengx/facilities/evaporation1- landscape.jpg I don't know what the knob on the lower right is - perhaps a

OK, I looked around on the Net and did some quick learning about TIG electrodes. As one member already suggested, green does appear the best choice, being essentially pure tungsten (99.97%). This type

Hello All, In my experince of vacuum coating, we should use tungsten filament for evaporating the aluminum. Ismail Darald Bantel <dbantel@...> wrote: Greetings I have NO experience with

You may recheck your Kanthal catalog as nichrome may be good for 1450 F as compared to C. A cigarette lighter will vaporize the aluminum but then you will alloy the aluminum with the nichrome and

So far as I know, they are all Tungsten. Some are alloyed with a small amount of Thorium, which makes the arc easier to start. I assume we don't want that.

actually. I had source, such the As I understand - unless the walls of the nozzle are held at a temperature akin to that of the evaporating aluminum - the aluminum will stick to the nozzle walls and

I think that if have decided to wind your own W filaments - you would be better off buying wire from www.smallparts.com as recently posted. Now about welding rods. Your welding supplier will carry all

Not knowing welding, are all TIG electrodes tungsten, or should I ask for a specific type? Dominic-Luc Webb

Try TIG welding electrodes. The issue is whether one wishes to evaporate pure aluminum, or also evaporate aluminum and some of your heating element with it, contaminating your mirror coating.

I was thinking about car cigarette light in these terms actually. I had idea to use a nozzle arrangement as an outlet above the heat source, such that the vapor would be forced to rise upward before

True enough; I think it's quite likely that the degree of vacuum attained by H P Friedrichs wasn't too high. I can confirm it's a great read! Hans

--- In VacuumX@..., Hans Summers <Hans.Summers@t...> I would think that once proper vacuum has been reached there won't be enough o2 left to cause any appreciable wear. Seems that for

Note I changed the subject heading to reflect the present topic: OK, what I am learning is that other electrode types might be prefered due to increased longevity, as per my original concern and now

Nichrome is also used in every day household toasters! The average household toaster holds two slices of bread. From my reading, it contains about 5m of nichrome wire and the power consumption is

According to telescope making volume 3, the filament materials in order of merit are tungsten, tantalum, molybdenum and columbium. Nichrome may also work as Nickel is a possible material. Nichrome may

Tungsten is strong for its thickness, but generally is very, very thin, as in light bulbs. However, the nichrome and kanthal wires are commonly much thick so are quite strong. Reduced form of aluminum