| There are three models at
both 1700°C and 1800°C, with capacities of 3.4, 7.9 and 21 litres.
The smallest version is a bench mounted unit, whereas the two larger
units are floor standing models.
This range of furnaces offers several advantages and
is suitable for firing and sintering of advanced ceramics and high temperature
glass melting. Excellent temperature uniformity is obtained by the inclusion
of molydenum disilicide heating elements which are positioned around
the walls of the chamber ensuring uniform heating of the sample. A combination
of dense refractory brick hot face insulation and a secondary low thermal
mass layer of insulation provides a robust chamber with an efficient
utilisation of power.
The electrically operated elevator hearth ensures
operator safety and prevents direct radiation of heat from the chambr
walls. It also ensures smooth loading and unloading of the workpiece/crucible
and allows both heavy and delicate loads to be handled easily. The loading
platform has a full travel which allows the complete chamber height
to be used.
Fast heating and cooling of the sample is obtained
by having the ability to move the sample in and out of the furnace when
hot or cold.
The furnace can be adapted to accomodate an atmosphere
other than air. This is possible by placing a large inverted alumina
crucible in a groove in the hearth. It is possible to partly fill this
groove with alumina (Al
2O3) or Zirconia (ZrO2) powder to improve the sealing.
Gas inlet and outlet connections allow atmospheres to be introduced
from below the hearth and spread by radial channels cut into the surface
of the hearth so that the inlet cannot be blocked by the sample positioned
on the hearth. The top of the furnace can be adapted to include the
facility to insert a probe thermocouple or provide access for stirrer.
Versions with rotating hearths are also available.
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A choice of programmable controllers is available together with other
advanced temperature control options, including computer communications.
An independent overtemperature control is fitted as standard and can
either be set to protect the furnace or adjusted to a lower temperature
to protect a valuable load.
Options include flowmeters, crucible clamps, radiation
shutters, crucibles and hearth cages.
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