Preparing a graphite electo melt crucible

One of he benefits of a graphite crucible is that the carbon combines with any oxygen present to create a reducing atmosphere within the crucible, helping to protect your metal, similar to how you would cover an open crucible with a flame. Coating the interior of the crucible with a barrier would prevent that.

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I have always used my furnace crucibles as-is and have had good results.

The crucibles do slowly get consumed. Some years ago an Orchid member said he weighed new ones and re-weighed them with each new use so he’d know when to retire them. I suppose worst case would be a honeycombed crucible having its bottom break down, especially when you stir the melt. They do get porous with repeated use.

Neil A

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