Paul Herman on tue 8 mar 05
John,
First, I'm no expert. But if you have access to free hard and fiber
refractories, grab all you can get. That stuff is expensive down at the
brick store.
A person could build a kiln with hard refractory on the inside and fiber
on the outside. I would be leery of laying the hardbrick on edge, it
might want to collapse. Which brings the question, "what kind of fuel do
you propose to use?"
If it's fossil fuel, it would cost a lot to heat the hard brick lining.
If it's wood or something renewable (read cheap) like deep fryer oil
then dandy, dump the fuel on.
A hard brick lining would cool slower, something that gets a lot of
discussion here on Clayart. In my opinion, and for my style, slow
cooling makes nicer glazes. It gives time for little crystals to grow.
My gas kiln is all softbrick, but it's 9 inches and cools pretty slow.
The wood kiln is hard brick inside and cools very slowly.
Pretty glazes,
Paul Herman
Great Basin Pottery
Doyle, California US
http://www.greatbasinpottery.com/
----------
>From: John Kudlacek
> Kiln Experts,
> I have access to free hard fire brick and Z-Bloc type ceramic fiber
> blocks. The blocks are about a foot square and six inches thick. Would it
> be practical to line a kiln with fire bricks on the flat or on edge and
> back it with the fiber blocks. It is intended for the kiln to be fired
> cone 10 reduction. What sort of firing, and cooling pattern could one
> expect? I have contemplated using the block as backing instead of on the
> interior since the heat rating of the fiber block is unkown.
> Any input on this would be greatly appreciated.
> Hope to see you in Baltimore.
> John Kudlacek
> Topeka
John Kudlacek on tue 8 mar 05
Kiln Experts,=20
I have access to free hard fire brick and Z-Bloc type ceramic fiber =
blocks. The blocks are about a foot square and six inches thick. Would =
it be practical to line a kiln with fire bricks on the flat or on edge =
and back it with the fiber blocks. It is intended for the kiln to be =
fired cone 10 reduction. What sort of firing, and cooling pattern could =
one expect? I have contemplated using the block as backing instead of =
on the interior since the heat rating of the fiber block is unkown.
Any input on this would be greatly appreciated.
Hope to see you in Baltimore.
John Kudlacek
Topeka
Frank Colson on tue 8 mar 05
John- Can you place one block into some currently active kiln and "test
drive" it by firing it to cone 10? Just to let you know, there isn't any
ceramic fiber of any shape, form, or thickness, that is rated under 2000 F!
In fact, most low grade fiber products are rated
at 2300 degrees. High grade fibers are standard at 2600 degrees. This all
depends if the fiber is made from Molichite, Silica, or ,zirconium.
Zirconium fibers are used for nuclear reactors and are stable indefiently at
3000 degrees.
I certainly would use your fiber as interior application (inside the heat
chamber). This way you will cut your fuel costs at least a third.
Hard brick
absorbe heat like a sponge before it turns around and "radiates" back into
the chamber. You will need to operate very differently as
it is necessary to "down fire" after reaching cone 10. I have operated such
a (80 cu.ft.) kiln for hi/fire reduction for yrs!
Frank Colson
----- Original Message -----
From: "John Kudlacek"
To:
Sent: Tuesday, March 08, 2005 8:13 PM
Subject: Hard fire brick and fiber insulation Kiln
Kiln Experts,
I have access to free hard fire brick and Z-Bloc type ceramic fiber
blocks. The blocks are about a foot square and six inches thick. Would it
be practical to line a kiln with fire bricks on the flat or on edge and
back it with the fiber blocks. It is intended for the kiln to be fired cone
10 reduction. What sort of firing, and cooling pattern could one expect? I
have contemplated using the block as backing instead of on the interior
since the heat rating of the fiber block is unkown.
Any input on this would be greatly appreciated.
Hope to see you in Baltimore.
John Kudlacek
Topeka
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