David Beumee on thu 15 apr 10
Is vapor glazing to be done only in hard brick kilns with silicon carbide o=
r
nitride bonded silicon carbide shelves?
My reduction kiln is lined with soft brick, K-23's and K-28's. Do I assume
correctly that soda vapor from soda ash
or sodium bicarb will corrode the soft brick as it glazes my cordierite
shelves, posts, and the inside of my kiln?
I'm trying to create an aesthetic where just the slightest hint of glaze
enhances the natural color of clay bodies and colored slips.
David Beumee
Porcelain by David Beumee
Lafayette, CO
Vince Pitelka on thu 15 apr 10
David Beumee wrote:
"Is vapor glazing to be done only in hard brick kilns with silicon carbide
or
nitride bonded silicon carbide shelves?
My reduction kiln is lined with soft brick, K-23's and K-28's. Do I assume
correctly that soda vapor from soda ash
or sodium bicarb will corrode the soft brick as it glazes my cordierite
shelves, posts, and the inside of my kiln?
I'm trying to create an aesthetic where just the slightest hint of glaze
enhances the natural color of clay bodies and colored slips."
David -
Soda firing is exactly what you need for that effect. You can do a limited
number of firings in your IFB kiln if you spray the inside of your kiln wit=
h
a wet, soaking coat of ITC. A few years ago, someone on Clayart reported
getting ten years out of a IFB soda kiln lined with ITC, but it turned out
that in that time the kiln had only been fired 75 time, and that's a pretty
poor record. I wouldn't want to see you kill your kiln like that. Better t=
o
build a dedicated soda kiln with a hardbrick interior and an IFB exterior,
and use nitride-bonded silcar shelves from Larkin. The cordierite shelves
are not suitable for soda firing.
- Vince
Vince Pitelka
Appalachian Center for Craft
Tennessee Tech University
vpitelka@dtccom.net; wpitelka@tntech.edu
http://iweb.tntech.edu/wpitelka
Steve Mills on fri 16 apr 10
David,
I vapour glaze, but in a way I think would suit you.
because I am no lover of heavy orange peel surfaces, I use one or two small
pots of plain salt in our fuel kiln, placed at the point where heat enters
the chamber. In the early stages of the firing (when there isn't a howling
draught roaring through the kiln) the salt vaporises, settling in a thin
film on the work and waits for the silica to catch up. The resulting
surfaces are very fine and responsive, particularly if you wood fire, when
you will get some subtle flame painting.
The total amount of salt used in our 9 Cu Ft Kiln is 2 tablespoons!
Obviously more is used in a bigger Kiln, but not much more.
With regard to the effect of this on the bricks, with this light salting
technique, we find a coating of alumina based Batt Wash (2 part Alumina to =
1
part kaolin) on the brick as well as the Batts and Props, to be quite
sufficient to prevent damage.
Best
Steve M
On 15 April 2010 13:56, David Beumee wrote:
> Is vapor glazing to be done only in hard brick kilns with silicon carbide
> or
> nitride bonded silicon carbide shelves?
> My reduction kiln is lined with soft brick, K-23's and K-28's. Do I assum=
e
> correctly that soda vapor from soda ash
> or sodium bicarb will corrode the soft brick as it glazes my cordierite
> shelves, posts, and the inside of my kiln?
> I'm trying to create an aesthetic where just the slightest hint of glaze
> enhances the natural color of clay bodies and colored slips.
>
> David Beumee
> Porcelain by David Beumee
> Lafayette, CO
>
--
Steve
Bath
UK
www.mudslinger.me.uk
Growing old is inevitable, growing up is optional!
David Beumee on fri 16 apr 10
Thanks very much to everyone for your help with my question concerning soft
brick kilns and soda firing.
David Beumee
Lafayette, CO
On Fri, Apr 16, 2010 at 7:44 AM, Steve Mills <
original.mudslinger@googlemail.com> wrote:
> David,
>
> I vapour glaze, but in a way I think would suit you.
>
> because I am no lover of heavy orange peel surfaces, I use one or two sma=
ll
> pots of plain salt in our fuel kiln, placed at the point where heat enter=
s
> the chamber. In the early stages of the firing (when there isn't a howlin=
g
> draught roaring through the kiln) the salt vaporises, settling in a thin
> film on the work and waits for the silica to catch up. The resulting
> surfaces are very fine and responsive, particularly if you wood fire, whe=
n
> you will get some subtle flame painting.
> The total amount of salt used in our 9 Cu Ft Kiln is 2 tablespoons!
> Obviously more is used in a bigger Kiln, but not much more.
> With regard to the effect of this on the bricks, with this light salting
> technique, we find a coating of alumina based Batt Wash (2 part Alumina t=
o 1
> part kaolin) on the brick as well as the Batts and Props, to be quite
> sufficient to prevent damage.
>
> Best
>
> Steve M
>
>
>
> On 15 April 2010 13:56, David Beumee wrote:
>
>> Is vapor glazing to be done only in hard brick kilns with silicon carbid=
e
>> or
>> nitride bonded silicon carbide shelves?
>> My reduction kiln is lined with soft brick, K-23's and K-28's. Do I assu=
me
>> correctly that soda vapor from soda ash
>> or sodium bicarb will corrode the soft brick as it glazes my cordierite
>> shelves, posts, and the inside of my kiln?
>> I'm trying to create an aesthetic where just the slightest hint of glaze
>> enhances the natural color of clay bodies and colored slips.
>>
>> David Beumee
>> Porcelain by David Beumee
>> Lafayette, CO
>>
>
>
>
> --
> Steve
> Bath
> UK
> www.mudslinger.me.uk
>
> Growing old is inevitable, growing up is optional!
>
Lee Love on sat 17 apr 10
The soda kilns at NCC have coated softbrick doors on the cars.
I spray Gail Nichols solution into the kiln. I also put salt cups
near pots around the kiln. The salt effect is very localized, not
effecting furniture or the kiln brick.
--
Lee, a Mashiko potter in Minneapolis
http://mashikopots.blogspot.com/
=3D93Observe the wonders as they occur around you. Don't claim them. Feel
the artistry moving through and be silent.=3D94 --Rumi
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