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 goes to melts at slightly above 500 degrees. It is
not clear to me that the temperature ratings you mention are
the determining factor in choice. I rather like the strength of
highly re-usable things like car cigarette lighters and kanthal
wires.
Perhaps there are specific tungsten electrodes one would suggest?
Perhaps someone knows there is in fact a reason to not use these
other options?
Dominic-Luc Webb
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On Mon, 8 Dec 2003, Darald Bantel wrote:
Greetings
I have NO experience with vacuum coating - but I would think that your
car cigarette lighter element would more likely be a nichrome type of
wire. From the Kanthal website it is rated to 1450 degrees C and
nichrome may be rated higher (but I doubt it) whereas tungsten is rated
at over 3400 degrees C - I know which one I would be using!
Darald
On Mon, 2003-12-08 at 03:38, Dominic-Luc Webb wrote:
This is my first post to this list. Let's see if it works.
I have a vacuum chamber, which pulls needed vacuum for aluminizing,
so I am now at stage of needing to get electrodes into the stainless
steel chamber. James Learch already offered some ideas, and I was
hoping to see if there were others as well. I would be happy to
know of specific electrodes used and how they were inserted into
the chamber.
Along same line, anyone know if Tungsten is really required? Can I
now instead use something like Kanthal wire or perhaps a car cigarette
lighter heating element, etc? This seems more convenient.
I'll now wait and see if this gets distributed to the members.
Dominic-Luc Webb
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