Amann Girrbach argovent 2 Mode D'emploi page 37

Question: After use, the light sintering cover
shows discolourations?
Answer: Darker discolourations
(grey/green/blue) on light-coloured oxide-
ceramic parts after usage are normal and harm-
less. After burning-in of various dusts, such as Sin-
tron residual powder (blue), oxide ceramics show
such discolourations.
Question: After sintering, pearls adhere to the
edge/rim of the sintering cover. Do these need to
be completely removed each time?
Answer: Pearls adhering to the cover do not have
to be completely removed. They can be left on
until the next sintering run and the cover is then
merely twisted into the bed of pearls again.
Question: Do the Argovent 2 components require
maintenance and may they only be handled with
gloves?
Answer: The Argovent 2 components can be
touched with bare fingers and without gloves. Dis-
colourations are completely harmless. The com-
ponents do not require maintenance or servicing.
However, it is possible to remove undesired burnt-
in residue/residual oxide by blasting them off. Use
a glass pearl blasting agent with a grain size of
50 μm.
Questions on discolouration/appearances on
the frame
Question: What if individual selective shiny
areas/spots appear on the frame?
Answer: Minor separations of the SiC bowl sur-
face can mix-in among the pearls and adhere to
the frame, which can lead to shiny spots. For this
reason, covers made of white oxide ceramics were
introduced, in order to protect the sintering mate-
rial against complete fusion through contact reac-
F R E Q U E N T L Y A S K E D Q U E S T I O N S ( F A Q )
tions. Selective shiny spots or areas may occur
and are harmless. This appearance merely occurs
on the surface and does not come from within the
material. Easy removal through slight grinding or
blasting off is sufficient.
Question: How can selective appearances on the
frame be prevented?
Answer: Do not scrape against the bowl bottom
with hard objects and afterwards allow for any
abrasions to mix among the pearls.
The bowl content, however, can be cleaned:
_ Separate the pearls from the powder,
_ Add fresh powder
_ Blast out bowl components before filling
(Establish original condition).
Questions on sintering pearls and additional
powder
Question: What about green-coloured, residual
powder adhering on the bowl bottom?
Answer: Green remainders of powder on the bowl
bottom or on the separating disc (after faulty sin-
tering due to lack of argon or power loss) can be
blasted off (50 μm aluminium corundum/glass
pearls).
Question: What about grey flakes in the pearls?
Answer: Lightly coloured flakes in the pearls
merely are sinter powder particles adhering
together, which have shed from the separating
disc. They can be left in the pearl mixture, mixed
in or removed individually without further consid-
eration.
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