RedDwarf
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Graphite Crucible
I've just bought a new graphite crucible from China, and wanted to know if it will always leave traces of graphite on everything (like a lead pencil)
or if this effect stops on heating or other treatment?
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Swinfi2
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Mine sheds carbon worse after heating. But it washes off skin fairly easily.
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njl
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pre-heating the crucible can minimize the degradation, but depending on the quality you may just have to live with the residues.
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RedDwarf
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Thanks for the replies, I usually use a porcelain crucible but wanted something a bit larger. I'll just have to be aware of the potential
contamination.
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MrHomeScientist
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My graphite crucibles I use for metal casting tend to flake off graphite pretty badly after being in the furnace. But your application may be less
demanding. I bought some Salamander crucibles that came highly recommended but haven't gotten around to using them yet; they have some sort of coating
that makes them hold up much better.
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Herr Haber
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Quote: Originally posted by RedDwarf  | | I've just bought a new graphite crucible from China, and wanted to know if it will always leave traces of graphite on everything (like a lead pencil)
or if this effect stops on heating or other treatment? |
In my experience it will only get worst.
The more you use it, the more it will "flake off" if that makes any meaning to you.
After a dozen uses you will be able to see it perfectly if you turn the lights off and look at the red hot crucible.
Edit: just read the other replies.
[Edited on 19-2-2020 by Herr Haber]
The spirit of adventure was upon me. Having nitric acid and copper, I had only to learn what the words 'act upon' meant. - Ira Remsen
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