2008-Jun-28 - Metal Casting Crucibles

Materials used: To construct a crucible, the usual refractory materials (i.e. carbon bonded silicon carbide and clay graphite) can survive the extremely high temperatures of work of a foundry. In addition, silicon carbide is a very durable material.

Some of the clay graphite crucibles can be used up to 2750 degrees Fahrenheit. Some A shaped crucibles are used up to 2000 degrees Fahrenheit. These crucibles can be used to handle gold, silver, bronze, brass, aluminum and zinc alloys.

The A shaped crucibles have a rough surface finish and there are dents along the rims. However, this roughness does not interfere with the performance by any means.

While handling crucibles, correctly fitting tongs must be used. In correct tongs can lead to damage or total failure of the crucible. In between the base of the furnace and the crucible there must be a disk of cardboard or a coating of Plumbago.