Instruction manual

OPERATING_MANUAL_MC20V.DOC 18.03.11 KS Seite 26
Palladium 950
Palladium should be melted in the same
type of crucible like Platinum. Palladium
has a strong reaction with oxygen. That´s
why we recommend to „wash“ the
chamber atmosphere as follows: Set
„power“ to zero “P000”. Put in metal, set
in flask.
Push button start (want to heat, but set
point power is zero = no heating
possible). After then start again =
vacuum comes. After reaching vacuum,
another push on start: vacuum will be
released by ARGON gas. Make only
ONE washing cycle!
Change setting of power to power
P100(%). Wait until metal is molten
completely and cast immediately.
IMPORTANT: Use Argon gas for
palladium castings.
Platinum
Set heating power to P100 (100%).
Use the special ceramic crucible for
Platinium. Put metal into the (cold)
crucible. Push “Start” once for heating,
set in flask and lock chamber. Push
“Start” second time to start the vacuum.
Full vacuum is reached inside the
gypsum in around 30 seconds (see
timer) After metal is molten totally, wait
for max. 8 seconds and cast. This will
prolongate the life time of the crucible!
Adjust your process in that way, that at
the moment for poring out the Pt and the
end of evacuation time (at least 30
seconds) of the flask are concurrently.
Important hint:
Pt, molten in a standard Pt-crucible, is
absorbing silicate out of the crucible
material. As more often you re-melt
same batch of metal, as more silicate
will be absorbed. This makes Pt brittle.
Help: Coating of the inside of the crucible
by use of liquid zircon oxide !
After casting: leave flask under set
parameters for approx. 240 seconds.