Troubleshooting - DENTSPLY Crypton Instrucciones Para El Uso

8 Troubleshooting

Oxide discolouration
– The appearance of a greyish to brownish oxide
discolouration is normal when sintering Crypton
frameworks. The frameworks can be sandblasted
with a recommended grit of 250 µm at a pressure
of 3 – 4 bar and then processed further
Sintering cycle without argon
– Crypton sintering beads will turn grey
during sintering cycles in an argon
atmosphere. This is a desired effect.
– During a sintering cycle without argon, the greyish
sintering beads will return to their original white
colour. The framework will be oxidized completely
and exhibit distinct scaling. The result is a greenish
to bluish oxide. The fit of the framework is no
longer ensured. If this happens, the framework
must be re-made. Re-sintering is not possible.
– Check to see that the argon bottle is sufficiently
filled, that the cables are leak-free and that no
parts of the sintering guard are damaged or dirty.
– After a sintering cycle without argon, at least
one idle cycle with argon is required. This should
ensure that the sintering beads return to grey.
– If the beads remain white, check the filling level
of the argon bottle and also check whether
different types of sintering beads could have
been confused (Al O instead of ZrO
2 3
– If the problem persists, contact a service technician.
Further points to note
– A cancelled or interrupted sintering cycle (e.g.
due to power failure) cannot be restarted. The
fit of the framework is no longer ensured. If this
happens, the framework must be re-made.
– If the sintering guard is clogged or stuck
after the sintering cycle, Al
probably used instead of ZrO
– Under certain circumstances, the sintering
beads may leave stains on the sintering object
or stick to it. If this effect is pronounced,
the sintering temperature of the furnace
should be checked by a service technician. If
necessary, the furnace must be recalibrated.
– If object was in contact with parts of the sintering
guard during the sintering cycle, the framework
will melt at the points of contact, leaving a
residue on the guard. This framework residue
must be completely removed from the guard by
sandblasting. If this is not possible, the affected
parts of the sintering guard must be replaced.
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O beads were
2 3
beads.
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