Salamander/Vesuvius are the best brand. They last forever and are really quite durable. I don't remember ever seeing proper crucible care mentioned on this board:
1.) When your new crucible arrives, make sure that it is free of cracks. A light rapping with a wooden dowel rod should make a ringing noise like a bell, it should not "thunk" (there may be voids in it/hollow spots).
2.) Bake the crucible slowly to remove any moisture that may be present in it. Most crucibles have not had their glaze set yet. Heat to 100*C over an hour, then 20*C/hr for the next 5 or so hours, after the water is driven off, you may go faster. Don't do it in a domestic oven, the glaze stinks at higher temperatures!!
3.) Take it to its expected operating temperature, hold it, then let it cool in the furnace. It may then be used. Remember to put a piece of cardboard in between the crucible and the plinth it sits upon, lest the crucible stick!
4.) Store all crucibles in a dry, cool place. Do not keep them in a humid environment. Technically, you should always heat them slowly at first. SiC crucibles are long-enduring and a great investment, despite their higher price. They are far less prone to thermal and mechanical shock when compared to clay-graphite. They don't oxidize as easily and they are wonderful for gold and silver but do not use for the PGMs for the same reason why one should avoid graphite: carbide formation.
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Continuous Casting Graphite Mould
Continuous casting is a casting method used in high volume production of metals with a constant cross-section. The method uses an open ended graphite die which is surrounded by a copper jacket. Through which is poured molten metal. The graphite mold is typically water cooled. This allows the molten metal to solidify within the die, the custom solid metal form is then extracted from the mold and pulled/passed through rollers and water sprays. This process removes the heat from the metal, and gradually solidifies it.
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Graphite is a widely used material in continuous casting. The die molds are generally produced out of graphite. In these types of applications, the types of graphite used are ISO-Molded types. Small porosities and good machinability are required properties, and ISO-molded graphite has those. In rare instances, where large ingots are produced, extruded graphite is used. There are two types of continuous casting processes, a vertical casting and a horizontal casting. Graphite molds are used in both types of applications.
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