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Author: Subject: ceramic crucibles

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Registered: 24-8-2005
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[*] posted on 8-2-2006 at 11:22
ceramic crucibles

This may seem like a stupid question, but can I use things like bowls that breakfast cereal is eaten out of as a ceramic crucible for high temperature apps? Or could things like terracotta or other common objects be used?

I didnt want to spend lots of money on a crucible if I could use something from around the house.

Apparently heating Ca(OH)2 to roughly ~550C decomposes it to the oxide, so I was hoping this was feasible with a ceramic crucible and a 2000W camping stove.

Any help would be great, thanks!
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[*] posted on 8-2-2006 at 13:54

At that temperature, I think you should be fine, 550C is a dull red heat, which seems too little for making CaO (making dead burnt CaO needs 1250C minimum). Terracotta would work best, I've melted small amounts of aluminum in a terracotta flowerpot crucible, and that melts at 640C.
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