Ivor and Olive Lewis on sat 25 feb 06
Dear Tim Knick,=20
Have a good look at your "Hypothetical" refractory insulating recipe =
and read your question carefully.
You say "What if i were to mix 50 percent aluminum hydrate, 25 percent =
whiting, and 25 percent coal powder? I could make a big brick form, let =
them dry and then fire them too cone 10 in my electric." and conclude =
"Is this a bad idea?"
Well, for one thing you may take the refractories of your electric kiln =
above their maximum service point. You will also stress the elements. =
For another, you are introducing an appreciable amount of flux of =
indeterminate melting point from Coal which might react strongly with =
Calcium Oxide from your Whiting and result in a meltdown
You need to get back to basics, to the fundamentals of ceramic chemistry =
if you wish to design refractories. As another correspondent said, buy =
decent bricks or prepared castable refractories.
Have fun.
Best regards,
Ivor Lewis.
Redhill,
South Australia.
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