> Will said:
>>Under 300 deg C which is just under where you can't see
>>the anode turn red in the dark, is where zirconium will
>>not do any good at all, neither for hydrogen or O2 and the
>>others. These heat colors work for any metal, but not for
>>graphite. You can check them against any heat treatment or
>>metalurgical chart.<
Peter said:
> According to my book on heat rreatment (Hardening,
Tempering and Heat treatment, Tubal Cain, Nexus Special
interests, ISBN 0 85242 837 5) in a dim natural light, 700
deg C is dull red, 740 blood red, 800 cherry red, 825 bright
cherry red, 850 red, 900 bright red and 1000 deg C is
yellow. Not to be confused with the pale straw through dark
blue used when tempering steel. I would be surprised if 300
deg C can be seen, even in the dark - unless maybe, you are
a pit viper!
Peter is correct according to data I have in multiple
reference sources.
~500 C is the very start of any detectable color as seen in
dark room
~600 C is a very dark blood red
~700C is a dull red
~800 C is cherry red
~900C is bright red
~1000 C is a lemon color, or the very start of yellow
Please note the color of a 3-500Z anode is not close to
being even along the length of the anode, so the getter is
not operated uniformly at one temperature.
73 Tom
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