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furnaces
› crucible furnace
crucible furnace
 a crucible furnace is a casting facility, in which
metal is melted in a pot (crucible) inside a furnace, before being
poured into a mould, usually constructed from sand. a sand-tray beneath
where molten metal is poured contains any spillage. there are tiles
which are situated around the work chamber. silicon carbide heating
elements are mounted horizontally behind these tiles.
the insulation is ensured by the low thermal mass ceramic fiber
material which results in low energy loss and insulating bricks below
the hearth provide good load bearing capacity. normally there are two
chambers in the crucible furnace. it may or may not have the apertures.
features
precaution
while operating, certain guidelines and precautions should be
followed to avoid accident. firstly the furnace must not be allowed
to come in close proximity of water as contact can cause the molten
aluminum- or zinc-based alloys used in the furnace to explode.
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- the furnace is either gas fired and oil fired. electric fired
crucible furnace are also very popular.
- the heat is protected by very well insulation system.
- they are easy to install and operate.
- some crucible furnace use a grade of firebrick designed
specifically for high temperature operation.
- normally the lower portion of the crucible furnace is designed to
be easily removed for replacement and/or repair.
- both prop rod and lid chain is used for opening the lid of the
furnace.
- available in various size shapes and dimensions.
- for crucible furnace that are used in glass industries are
provided with baffle that helps to keep the heat in the firing
chamber as the lid is opened
applications
following are the applications of crucible furnace:
- annealing
- heat treating
- research & development
- melting
- sintering ceramics
- gold melting
- silver melting
- copper melting
- thermal reactors
- general purpose heating
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