Jocelyn McAuley on tue 9 jul 02
Hello Clay Friends
Does anyone out there have experience firing crystalline glazes in a large
front loading Bailey electric kiln?
I have access to one, and it is rated to fire to cone 10. However, my
experience in using this kiln for bisque firing is that it cools very
slowly. And because of the location of the control panel one cannot crack
the door open at all to help it cool.
I know that slow cooling is desirable for these glazes, however I am
wondering about the cooling rate after I reach peak temperature being too
slow.
This kiln is so large I would feel silly putting in only a couple of
tests, but then again, that's what I might have to do!
thanks
Jocelyn
--
Jocelyn McAuley ><<'> jocie@worlddomination.net
Eugene, Oregon http://www.ceramicism.com
Alisa Liskin Clausen on wed 10 jul 02
Dear Joycelyn,
I have just tried some crystal cone 6 glazes (too runny) and I found that
the slower the cooling, the larger the crystals.
I hit 1220, hold only 5 minutes and then cool down to 1100c. There I held
for both 60 minutes and then another time for 90 minutes. The crystals on
the second firing were larger. Not extremely so, but larger. So, I do not
think slow cooling is a problem, but fast cooling is.
good luck, Alisa in Denmark
Ilene Mahler on wed 10 jul 02
can you open the door to get the fast cooling when you reach temp to get
down to the crystal forming cycle ,,if not take out peeps and see how long
it takes to your first down cycle... remember the fast down is important..I
do not open my kiln the new Skutt must program a fast down..Ilene in Conn
waiting for the last 1/2 hour in my glaze cycle test before I fire the
teapots for Tenn...
----- Original Message -----
From: Jocelyn McAuley
To:
Sent: Tuesday, July 09, 2002 4:01 PM
Subject: crystals in a Bailey?
> Hello Clay Friends
>
> Does anyone out there have experience firing crystalline glazes in a large
> front loading Bailey electric kiln?
>
> I have access to one, and it is rated to fire to cone 10. However, my
> experience in using this kiln for bisque firing is that it cools very
> slowly. And because of the location of the control panel one cannot crack
> the door open at all to help it cool.
>
> I know that slow cooling is desirable for these glazes, however I am
> wondering about the cooling rate after I reach peak temperature being too
> slow.
>
> This kiln is so large I would feel silly putting in only a couple of
> tests, but then again, that's what I might have to do!
>
> thanks
> Jocelyn
>
> --
> Jocelyn McAuley ><<'> jocie@worlddomination.net
> Eugene, Oregon http://www.ceramicism.com
>
>
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Jocelyn McAuley on wed 10 jul 02
> can you open the door to get the fast cooling when you reach temp to get
> down to the crystal forming cycle ,,if not take out peeps and see how long
> it takes to your first down cycle... remember the fast down is important..I
> do not open my kiln the new Skutt must program a fast down..Ilene in Conn
> waiting for the last 1/2 hour in my glaze cycle test before I fire the
> teapots for Tenn...
Hi Ilene,
as I stated in my post, I am unable to crack the door at all.
The kiln has several peeps- I don't really think they'll help that
much... this is a large well insulated kiln.
I think I'll just try and only put a couple fo tests in this monster of a
kiln.
thanks
PS,
with your skutt- do you find that the 9999 ramp works for the fire down
portion?
--
Jocelyn McAuley ><<'> jocie@worlddomination.net
Eugene, Oregon http://www.ceramicism.com
Jocelyn McAuley on wed 10 jul 02
Thanks for your reply Alisa,
I am interested in the first part of the cooling curve- which
traditionally is thought of as needing to be fast- not slow, in order to
prevent too much interaction between the glaze and the clay body.
In regards to your holding time stated... you didn't say what shape your
resulting crystals are and how numerous they are. That would give an
indication of what 1100 means for your particular glaze recipe. With the
cool cycle there are two general areas for crystals: the seeding range and
the grow out range. You might find interesting results if you cruise
through a range of temperatures in your cool down rather than holding out
on just one. For example, I like to cool slowly from 1100 to 1065C. And
then there's the technicue for making halos, by bringing the kiln back up
after your cool down.
Hope you're having fun with your glazing!
thanks again,
Jocelyn
--
Jocelyn McAuley ><<'> jocie@worlddomination.net
Eugene, Oregon http://www.ceramicism.com
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