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2008-Jun-10 - Metal Casting Crucibles

Posted in Metal Casting
A pot in which metal is held, while melting in a furnace is called as a “Crucible.” It is made of silicon carbide and clay graphite.

Shapes of crucibles: A bilge shaped crucible has the shape of a barrel. The part of the crucible in the middle region is called as a bilge. This is the widest part of the crucible and has the maximum diameter. The top of the crucible has lesser diameter than the bilge. The base of the crucible has lesser diameter than the top. As per a thumb rule, the # of a bilge crucible is the number of pounds of aluminum that it would hold. For bronze and brass, thrice the # can be held. For instance, a #5 bilge crucible can hold almost 5 pounds of aluminum and 15 pounds of brass. This thumb rule is applicable for bilge shape only.

An “A” shaped crucible has a narrow bottom and a wider top. There are straight sides that are bent outwards. The diameter continuously increases from the base to the top. As it is simpler to manufacture this shape than the bilge one, the A shaped crucible has a lesser cost. When compared with the equivalent bilge style, the capacity of the A shaped crucible is lesser.

Both the above mentioned shapes can be manufactured in Clay graphite and silicon carbide.

Properties of crucibles: A crucible must be able to bear the extremely high temperatures of the molten metal. For this, the melting point of the material used to create the crucible must be more than the melting point of the metal that in placed in the crucible. Also, the crucible material must have excellent strength even in the white hot state.


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