vibbzlab
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Thermal Tolerance of this crucible
Hello friends
I just bought a porcelain crucible
I don't know how much temperature it can withstand.
I knew that silica crucible is way better,but the cost made me buy this one.
If someone could help me please tell
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Sulaiman
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Most seem to be rated just over 1000oC
e.g. 1050oC
CAUTION : Hobby Chemist, not Professional or even Amateur
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vibbzlab
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I was planning to make phthtalic anhydride from Phthalic acid by heating it
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Ubya
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.....
why did you even ask then, the dehydration reaction of phthalic acid to the anhydride happens at 180-200°C, how could you think that a porcelain
crucible couldn't withstand it?
nurdrage and many other amateur chemists did this reaction in a plain normal beaker without any problems, why the hassle of using a crucible?
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vibbzlab
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I bought crucible for thermite reaction
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Ubya
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Depending on the termite reaction it could survive or not.
Iron oxide+aluminum, probably it won't survive
Copper oxide+aluminum, it won't survive for sure (boom)
For termite reaction you are better using cheap flower pots, if you check a few videos on YouTube you'll know why.
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vibbzlab
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Will silica crucibles survive that?
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SWIM
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Graphite will.
Not sure about silica but don't think so.
Silicon dioxide supposedly can be used in a thermite reaction with aluminum and sulfur to make silicon.
Even if the crucible stayed intact I'd be worried about serious pitting, which wouldn't be easy to rectify and might make the crucible a real drag to
use.
There's a lot to be said for using Terra Cotta pots as Ubya said above.
They're cheap, and if one does fail, who cares? It's not like you just ruined an expensive crucible made of unobtanium.
A lot of the thermite reactions reported here have been done in steel containers. Not Al/FeO, obviously, but lower temperature reactions for reducing
various alkalais to metals.
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vibbzlab
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I will get terracotta ones then
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Sulaiman
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Small note :
if you look at your porcelain crucible and lid you will notice un-glazed areas, typically around the rims.
This is not a manufacturing defect, it is where water vapour is allowed to escape.
So before blasting the crucible with heat,
slowly increase the heat to well above 100oC to eliminate water that is trapped in the bulk of the material,
otherwise there is a significant possibility of cracking due to the internal pressure of superheated steam.
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vibbzlab
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Ohh great. I just noticed that. Thanks for that
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wg48temp9
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Quote: Originally posted by Sulaiman  | Small note :
if you look at your porcelain crucible and lid you will notice un-glazed areas, typically around the rims.
This is not a manufacturing defect, it is where water vapour is allowed to escape.
So before blasting the crucible with heat,
slowly increase the heat to well above 100oC to eliminate water that is trapped in the bulk of the material,
otherwise there is a significant possibility of cracking due to the internal pressure of superheated steam. |
The unglazed area is usually the area were the ceramic item seats on the kiln shelve and if the item is fired properly the body should not be porous
but perhaps cheap items are.
I have a ceramic mug that can not be put in a MO because if you do the ceramic can gets very hot particularly the handle Ouch!!!. All my other
ceramic mugs do not absorb microwaves even though they have an unglazed rim on the bottom because water can not get in to them as they are not porous.
I am wg48 but not on my usual pc hence the temp handle.
Thank goodness for Fleming and the fungi.
Old codger' lives matters, wear a mask and help save them.
Be aware of demagoguery, keep your frontal lobes fully engaged.
I don't know who invented mRNA vaccines but they should get a fancy medal and I hope they made a shed load of money from it.
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